The best greenhouse temperature controllers give you dependable heating and cooling control without making setup harder than it needs to be. I’d start with the Inkbird WiFi ITC-308 as the best overall option for growers who want separate heating and cooling outlets plus remote monitoring; the WILLHI WH2408 is a strong alternative for a straightforward wired setup, while the SENSTREE Waterproof Controller suits buyers who need a more weather-conscious unit. The main tradeoffs are Wi-Fi versus simple local control, dual-output flexibility versus a single switching function, and probe or enclosure suitability for a damp greenhouse. Read on for how all 14 options compare and which type of setup each one fits best.
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Key Takeaways
- Dual heating-and-cooling control is the clearest advantage among the Inkbird ITC-308 models; single-function outlets may suit one appliance but can require a second controller for a different task.
- The Wi-Fi models add remote monitoring and control, while non-Wi-Fi versions keep the setup simpler and avoid making an app part of routine operation.
- The WILLHI WH2408 and DIGITEN DTC151 stand out for buyers comparing higher stated switching capacity, but capacity alone does not confirm compatibility with every heater or fan.
- The SENSTREE and DIGITEN DTC310 waterproof-oriented designs address exposure concerns better than a basic outlet controller, but no controller should be treated as safe to leave in standing water.
- The Inkbird IHC-200 temperature-and-humidity pairing is the most targeted choice for growers managing two environmental variables; it adds capability beyond a simple temperature-only thermostat.
| Inkbird WiFi ITC-308 Digital Temperature Controller Thermostat |  | Best for Remote Monitoring | Model: WiFi ITC-308-US | Connectivity: 2.4 GHz Wi-Fi | Control: Heating and cooling | VIEW LATEST PRICE | See Our Full Breakdown |
| BN-LINK Digital Reptile Thermostat Temperature Controller, 40–108°F, 1000W |  | Best for Simple Heating | Model: T7(H) | Temperature range: 40–108°F | Maximum load: 8.3A, 1000W | VIEW LATEST PRICE | See Our Full Breakdown |
| WILLHI WH2408 Digital Temperature Controller, 10A, 1200W |  | Best Value for Dual-Mode Control | Model: WH2408 | Probe temperature range: -58°F to 230°F (-50°C to 110°C) | Controller ambient range: -4°F to 140°F (-20°C to 60°C) | VIEW LATEST PRICE | See Our Full Breakdown |
| DEWENWILS Smart Temperature Controller with Wi-Fi and Memory |  | Best for Scheduling and Mode Flexibility | Connectivity: Wi-Fi | Voltage: 120 V | Wattage: 1800 W | VIEW LATEST PRICE | See Our Full Breakdown |
| Inkbird ITC-308 Digital Temperature Controller |  | Best Overall for Straightforward Dual-Outlet Control | Model: ITC-308 | Voltage: 110 V, 240 V | Maximum power: 1200 W | VIEW LATEST PRICE | See Our Full Breakdown |
| DIGITEN DTC151 110V 15A Digital Temperature Controller |  | Best for Wide Temperature Coverage | Voltage: 110V | Maximum current: 15A | Maximum wattage: 1650W | VIEW LATEST PRICE | See Our Full Breakdown |
| KETOTEK KT3100 Digital Thermostat Outlet with 3 m Probe |  | Best for Timed Control Options | Power supply: 100–250V AC | Maximum output: 15A at 120V | Temperature range: -40°C to 120°C (-40°F to 248°F) | VIEW LATEST PRICE | See Our Full Breakdown |
| Inkbird ITC-308 WiFi Temperature Controller |  | Best for Remote Monitoring | Model: ITC-308-WIFI-LW | Connectivity: 2.4 GHz Wi-Fi | App: InkbirdSmart | VIEW LATEST PRICE | See Our Full Breakdown |
| Diymore Plug-In Digital Thermostat Controller |  | Best for Multiple Control Modes | Model: GXAB0002-006 | Voltage: 220V | Maximum power: 1800W | VIEW LATEST PRICE | See Our Full Breakdown |
| BN-LINK Digital Cooling Thermostat Controller Outlet Switch |  | Best for Cooling-Only Greenhouses | Model: BNQ-T7B(C) | Control type: Cooling | Temperature range: 40–108°F | VIEW LATEST PRICE | See Our Full Breakdown |
| INKTEM Digital Temperature Controller for Heating and Cooling, 110–230V |  | Best for Heating-and-Cooling Flexibility | Model: TC01 | Input voltage: 120V AC, 60Hz or 230V AC, 50Hz | Maximum load: 10A; 1200W at 120V or 2300W at 230V | VIEW LATEST PRICE | See Our Full Breakdown |
| Inkbird ITC-308 Temperature Controller and IHC-200 Humidity Controller |  | Best for Temperature and Humidity Control | Included controllers: ITC-308 temperature controller and IHC-200 humidity controller | Part number: ITC308+ITC200 US | Voltage: 120V | VIEW LATEST PRICE | See Our Full Breakdown |
| SENSTREE Waterproof Digital Temperature Controller, 110V, 10A, 1100W |  | Best Compact Waterproof Pick | Model: DTC310ZJ-JP | Voltage: 110V or 220V | Current: 10A | VIEW LATEST PRICE | See Our Full Breakdown |
| DIGITEN DTC310 Waterproof Digital Temperature Controller, 10A |  | Best for Wide Temperature Monitoring | Model: DTC-310 | Temperature range: -40°F to 248°F (-40°C to 120°C) | Current: 10A | VIEW LATEST PRICE | See Our Full Breakdown |
| greenhouse temperature controller | Model | Voltage | Display | Temperature range |
|---|---|---|---|---|
| Inkbird WiFi ITC-308 Digital T | WiFi ITC-308-US | 110 V | Digital, 6.7 inches | — |
| BN-LINK Digital Reptile Thermo | T7(H) | 120VAC, 60Hz | LED | 40–108°F |
| WILLHI WH2408 Digital Temperat | WH2408 | — | — | — |
| DEWENWILS Smart Temperature Co | — | 120 V | Backlit LCD | -40°F to 210°F |
| Inkbird ITC-308 Digital Temper | ITC-308 | 110 V, 240 V | LCD | — |
| DIGITEN DTC151 110V 15A Digita | — | 110V | LCD | -40°F to 248°F |
| KETOTEK KT3100 Digital Thermos | — | — | Celsius or Fahrenheit | -40°C to 120°C (-40°F to 248°F) |
| Inkbird ITC-308 WiFi Temperatu | ITC-308-WIFI-LW | 110V | LCD | — |
| Diymore Plug-In Digital Thermo | GXAB0002-006 | 220V | — | -40°F to 248°F |
| BN-LINK Digital Cooling Thermo | BNQ-T7B(C) | 120VAC, 60Hz | — | 40–108°F |
| INKTEM Digital Temperature Con | TC01 | — | Dual digital display; Celsius or Fahrenheit | — |
| Inkbird ITC-308 Temperature Co | — | 120V | — | — |
| SENSTREE Waterproof Digital Te | DTC310ZJ-JP | 110V or 220V | LCD; °C/°F | — |
| DIGITEN DTC310 Waterproof Digi | DTC-310 | — | Illuminated LED | -40°F to 248°F (-40°C to 120°C) |
More Details on Our Top Picks
Inkbird WiFi ITC-308 Digital Temperature Controller Thermostat
The WiFi ITC-308 is my pick for greenhouse growers who want to check temperatures and adjust heating or cooling when they are away. Its app-based monitoring, high- and low-temperature alarms, and dual relay outputs make it more informative than the heating-only BN-LINK T7(H), especially when a greenhouse needs both heating and refrigeration equipment controlled. The alarm feature can alert you to conditions needing attention, though remote monitoring still depends on a working 2.4 GHz Wi-Fi connection. Its 1100W maximum output at 110V is also lower than the 1200W rating listed for the standard Inkbird ITC-308, so I would match the load carefully before choosing it. For app access, that power limit is a real tradeoff rather than a minor detail.
Pros:- Remote monitoring and control through an iOS or Android app
- Dual relay outputs support heating and cooling equipment
- Configurable high- and low-temperature alarms
- Celsius/Fahrenheit display and temperature calibration
Cons:- Wi-Fi connection is limited to 2.4 GHz
- 1100W maximum output at 110V is lower than the standard Inkbird ITC-308’s listed 1200W maximum power
Best for: Greenhouse owners who want app-based temperature checks and alerts while away, and whose connected equipment stays within the 1100W output limit.
Not ideal for: Growers without reliable 2.4 GHz Wi-Fi or those whose heating and cooling equipment exceeds its stated 1100W maximum output at 110V.
- Model:WiFi ITC-308-US
- Connectivity:2.4 GHz Wi-Fi
- Control:Heating and cooling
- Relay outputs:Dual
- Voltage:110 V
- Maximum output load:1100 W at 110 V
- Display:Digital, 6.7 inches
- Dimensions:1.2 × 2.6 × 6.7 in (D × W × H)
Our verdict“Choose this Inkbird if remote access and alerts matter more than the higher listed power limit of the standard ITC-308.”
BN-LINK Digital Reptile Thermostat Temperature Controller, 40–108°F, 1000W
The BN-LINK T7(H) is the straightforward choice when a greenhouse only needs controlled heat for seedling mats or another compatible heater. Its three-button interface, LED readout, and status lights keep setup simple compared with app-enabled picks such as the Inkbird WiFi ITC-308. That simplicity comes with a firm limit: this controller is heating-only, so it cannot manage a cooling device when the greenhouse gets too warm. Its 40–108°F control range fits many seed-starting and enclosure uses, but it offers less range than the WILLHI WH2408, which supports both heating and cooling and a much broader probe range. I would favor BN-LINK for a small, uncomplicated heating setup, not for growers seeking one controller for year-round temperature management.
Pros:- Simple three-button controls with Fahrenheit and Celsius options
- LED display and status lights are easy to read
- Includes a temperature probe and hanging tab
- ETL-listed and rated for loads up to 1000W
Cons:- Controls heating devices only, unlike the Inkbird ITC-308 models and WILLHI WH2408
- 40–108°F range limits use outside common heating applications
- Power cord and probe lengths may restrict placement in larger greenhouse layouts
Best for: Seed starters and small greenhouse owners who need a simple thermostat for a heat mat, heat lamp, or other heating device rated within its 1000W limit.
Not ideal for: Growers who need cooling control, a wider temperature range, or remote monitoring through an app.
- Model:T7(H)
- Temperature range:40–108°F
- Maximum load:8.3A, 1000W
- Voltage:120VAC, 60Hz
- Controller type:Push button
- Display:LED
- Power cord length:3.94 ft
- Probe length:4.92 ft
- Safety listing:ETL listed
Our verdict“Pick the BN-LINK for an uncomplicated heating-only setup, but choose a dual-mode controller if you also need cooling.”
WILLHI WH2408 Digital Temperature Controller, 10A, 1200W
The WILLHI WH2408 suits growers who want heating and cooling control without relying on Wi-Fi or a more elaborate app interface. Its two-knob setup is simpler than the scheduled modes on the DEWENWILS Smart Temperature Controller, while the settings memory brings the controller back to its prior configuration after a power outage. The broad probe range, from -58°F to 230°F, gives it more flexibility than the BN-LINK T7(H), which is restricted to heating and a 40–108°F range. The tradeoff is that the WH2408 is not a safety device: its housing must stay dry, and attached equipment needs its own thermal and overload protection. I would choose it for a practical greenhouse setup where basic dual-mode control matters more than remote access or built-in scheduling.
Pros:- Heating and cooling modes cover more greenhouse needs than the heating-only BN-LINK T7(H)
- Two-knob adjustments keep operation straightforward
- Remembers settings after a power outage
- Food-grade probe supports a wide temperature range and 0.1°F resolution
Cons:- Controller housing must be kept dry
- Connected equipment needs its own thermal and overload protection
- Probe may have a shorter lifespan with prolonged saltwater use
Best for: Hands-on greenhouse growers who want a broad-range heating-and-cooling controller with simple manual adjustments and outage memory.
Not ideal for: Buyers who need a weatherproof controller housing, app-based monitoring, or a controller that can replace equipment-level safety protections.
- Model:WH2408
- Probe temperature range:-58°F to 230°F (-50°C to 110°C)
- Controller ambient range:-4°F to 140°F (-20°C to 60°C)
- Control resolution:0.1°F
- Modes:Heating and cooling
- Display units:Fahrenheit and Celsius
- Safety features:ETL-certified power cord and resettable fuse
Our verdict“Choose the WH2408 for simple, broad-range heating and cooling control if you can keep the controller dry and provide separate equipment safeguards.”
DEWENWILS Smart Temperature Controller with Wi-Fi and Memory
The DEWENWILS Smart Temperature Controller is the strongest fit here for growers who want more than a remote temperature reading. Its six modes, including heating or cooling with timer operation, plus auto-scheduling can suit a greenhouse routine that changes over the day. That makes it more flexible on paper than the Inkbird WiFi ITC-308, whose supplied details emphasize remote control and alarms rather than a six-mode schedule. DEWENWILS also lists a higher 1800W rating than either Inkbird model in this batch. The tradeoff is dependence on Wi-Fi for app control; the product information does not specify a Wi-Fi band or a probe length, so I would verify connectivity and placement needs before buying. Its one-year warranty is also a defined limit for buyers comparing support terms.
Pros:- Six operating modes include heating, cooling, timer, and combined modes
- Supports app control and automatic scheduling
- Restores previous settings after a power outage
- 1800W listed wattage exceeds the ratings provided for the Inkbird controllers in this batch
Cons:- Remote app control requires Wi-Fi
- Product data does not specify a Wi-Fi band or probe length
- One-year warranty may be limiting for buyers seeking a longer stated coverage period
Best for: Greenhouse owners who want app control, scheduled heating or cooling, and multiple operating modes for changing daily routines.
Not ideal for: Buyers who need app features without Wi-Fi, or who require confirmed probe details and connectivity specifications before installation.
- Connectivity:Wi-Fi
- Voltage:120 V
- Wattage:1800 W
- Temperature range:-40°F to 210°F
- Temperature accuracy:0.1°F
- Modes:Cooling + Timer, Heating + Timer, Cooling, Heating, Timer, and OFF
- Display:Backlit LCD
- Memory:Restores settings after a power outage
- Warranty:1 year
Our verdict“Choose DEWENWILS if scheduled, multi-mode app control is your priority and your greenhouse has reliable Wi-Fi.”
Inkbird ITC-308 Digital Temperature Controller
The standard Inkbird ITC-308 is my best overall fit for growers who want a dedicated controller for both heating and cooling without app dependence. Its separate, marked outlets make it clear where to connect each type of equipment, while the probe, calibration, and Celsius/Fahrenheit display cover the core greenhouse tasks. Compared with the Inkbird WiFi ITC-308, this version gives up remote app monitoring and alarms but lists a 1200W maximum power figure, versus 1100W at 110V for the Wi-Fi model. The WILLHI WH2408 also offers dual-mode control and setting memory; the Inkbird’s separate outlets may be easier to identify during setup, but the supplied data does not list a broad probe range or outage memory. Its voltage specifications span 110V and 240V, so buyers should confirm compatibility with their equipment and local supply.
Pros:- Separate marked outlets control heating and cooling equipment
- Supports Celsius and Fahrenheit
- Temperature calibration lets users adjust the displayed reading
- Listed maximum power of 1200W is higher than the Wi-Fi Inkbird model’s 1100W at 110V
Cons:- No Wi-Fi or remote app features are listed, unlike the Wi-Fi Inkbird and DEWENWILS models
- The supplied specifications do not state a probe temperature range
- Buyers must confirm voltage compatibility with their equipment and local supply
Best for: Greenhouse owners who want clearly separated heating and cooling outlets, local temperature control, and no need for app monitoring.
Not ideal for: Growers who want remote alerts, scheduling, or clearly stated power-outage memory, or who have not confirmed voltage and equipment compatibility.
- Model:ITC-308
- Voltage:110 V, 240 V
- Maximum power:1200 W
- Display:LCD
- Operating temperature:75 °C
- Temperature units:Celsius and Fahrenheit
- Control outlets:Heating and cooling
- Dimensions:1.65 × 0.94 × 3.35 in
Our verdict“Choose the standard ITC-308 for clearly labeled local heating-and-cooling control, and choose the Wi-Fi version if remote monitoring matters more.”
DIGITEN DTC151 110V 15A Digital Temperature Controller
The DIGITEN DTC151 suits greenhouse owners who need both heating and cooling control across an unusually broad temperature range, from -40°F to 248°F. Its included probe, alarms, and compressor delay add useful safeguards when switching between equipment or managing temperature-sensitive spaces. Compared with the BN-LINK Digital Cooling Thermostat Controller, this model can operate heating equipment as well as cooling devices, so it is more adaptable through changing seasons. The tradeoff is that its controls are push-button only: unlike the Wi-Fi-enabled Inkbird ITC-308, it does not offer remote monitoring. It also needs a nearby corded outlet, and the 15A rating should not be treated as a substitute for checking the requirements of the specific heater or cooler. I’d choose it for straightforward, broad-range control rather than app access.
Pros:- Controls both heating and cooling equipment
- Broad -40°F to 248°F temperature range
- Includes an NTC sensor probe
- Temperature alarms and adjustable compressor delay
Cons:- No Wi-Fi or app-based monitoring
- Push-button operation requires adjustments at the controller
- Corded design limits placement to locations near an outlet
Best for: Greenhouse growers who need a plug-in controller for both heating and cooling, especially where temperatures may move well beyond ordinary room conditions.
Not ideal for: Growers who want phone-based monitoring or remote adjustments, or who cannot place the controller near a corded outlet.
- Voltage:110V
- Maximum current:15A
- Maximum wattage:1650W
- Temperature range:-40°F to 248°F
- Control modes:Heating and cooling
- Display:LCD
- Sensor:Included NTC sensor
- Power source:Corded electric
Our verdict“Choose the DIGITEN DTC151 if you want wide-range heating and cooling control without needing app connectivity.”
KETOTEK KT3100 Digital Thermostat Outlet with 3 m Probe
The KETOTEK KT3100 stands apart for combining heating and cooling control with cycle and countdown timers. Its 3 m probe gives growers more freedom to position the sensor away from the outlet, while memory retention helps restore saved settings after a power interruption. That flexibility makes it more feature-rich than the BN-LINK Digital Cooling Thermostat Controller, which is limited to cooling and has a narrower temperature range. The KT3100’s key limitation is a real one for greenhouse use: timer functions and temperature control cannot run at the same time. So it is a better fit for someone who will use its operating modes separately than for a grower expecting scheduled timing alongside automatic temperature regulation. It offers a useful mix of control choices, but not simultaneous automation.
Pros:- Supports both heating and cooling
- 3 m NTC probe allows flexible sensor placement
- Includes cycle and countdown timer modes
- Memory retains settings after a power outage
Cons:- Timer and temperature-control functions cannot operate simultaneously
- No Wi-Fi or app monitoring
- Maximum output is specified at 15A at 120V, so equipment compatibility needs checking
Best for: Greenhouse owners who want heating and cooling control, a long sensor lead, and separate timer modes for occasional scheduled operation.
Not ideal for: Growers who need temperature regulation and timer scheduling to operate together, or who want app-based remote monitoring.
- Power supply:100–250V AC
- Maximum output:15A at 120V
- Temperature range:-40°C to 120°C (-40°F to 248°F)
- Control accuracy:±1°C / ±2°F
- Probe:3 m NTC 10K sensor
- Timer range:0–99 hours 59 minutes
- Operating modes:Heating, cooling, cycle timer, and countdown
- Display:Celsius or Fahrenheit
Our verdict“Pick the KT3100 if separate timer modes and a long probe matter more than running schedules alongside temperature control.”
Inkbird ITC-308 WiFi Temperature Controller
For growers who cannot always be near the greenhouse, the Inkbird ITC-308 WiFi brings temperature monitoring to the InkbirdSmart app over a 2.4 GHz Wi-Fi connection. Its dual relay can manage heating and cooling equipment, while adjustable alarms and calibration give users more oversight than the offline DIGITEN DTC151. That remote access is the deciding difference, not a broader temperature range or higher stated load: the Inkbird is rated for 1100W at 110V, so equipment demand needs careful checking. The app also depends on a compatible network, and iOS users need version 13 or later. I’d rank it ahead of basic plug-in controllers for greenhouse owners who value alerts away from home, but skip it if Wi-Fi access is unreliable or unnecessary.
Pros:- Remote temperature monitoring through the InkbirdSmart app
- Dual relay supports heating and cooling
- Adjustable high- and low-temperature alarms
- Temperature calibration and Celsius/Fahrenheit readings
Cons:- Requires a 2.4 GHz Wi-Fi network for app access
- Maximum output is 1100W at 110V
- iOS app compatibility requires iOS 13 or later
Best for: Greenhouse growers who want to check temperatures and receive alerts remotely using a compatible 2.4 GHz Wi-Fi network.
Not ideal for: Growers without dependable 2.4 GHz Wi-Fi, users with older unsupported iOS devices, or anyone whose equipment exceeds the stated 1100W load.
- Model:ITC-308-WIFI-LW
- Connectivity:2.4 GHz Wi-Fi
- App:InkbirdSmart
- Voltage:110V
- Maximum output load:1100W at 110V
- Temperature control:Heating and cooling
- Display:LCD
- Included components:Temperature controller and probe
Our verdict“Choose the Wi-Fi Inkbird ITC-308 if remote checks and alerts matter more than a higher stated output rating.”
Diymore Plug-In Digital Thermostat Controller
The Diymore Plug-In Digital Thermostat Controller is aimed at growers who want several operating choices in a compact, no-wiring format. It offers five control modes, timer settings up to 99 hours, and stated temperature precision of ±1°F, which gives it more mode flexibility than the simpler DIGITEN DTC151. Its listed 1800W capacity also exceeds the Inkbird ITC-308 WiFi’s stated 1100W output, but the Diymore data lists 220V; buyers should confirm that voltage matches their outlet and equipment before choosing it. That compatibility check is the main caveat, not an optional detail. The six-foot sensor cord can help with placement, but this is still a corded controller without the Inkbird’s remote app access. I’d shortlist it for buyers who value local mode options and have confirmed their electrical setup.
Pros:- Five control modes and timer settings up to 99 hours
- Stated temperature precision of ±1°F
- Listed maximum power of 1800W
- Six-foot sensor cord and settings retention after power outages
Cons:- Listed 220V voltage requires compatibility checks before purchase
- No Wi-Fi or remote app monitoring
- The supplied information does not specify each of the five modes
Best for: Greenhouse owners who want several local operating modes and timer settings, and whose outlet and equipment are confirmed compatible with the listed 220V specification.
Not ideal for: Buyers who need Wi-Fi monitoring, are unsure whether their electrical system supports 220V, or want a controller with clearly specified dual heating-and-cooling mode details.
- Model:GXAB0002-006
- Voltage:220V
- Maximum power:1800W
- Temperature range:-40°F to 248°F
- Temperature precision:±1°F
- Control modes:5
- Timer:Up to 99 hours
- Sensor cord length:6 ft
Our verdict“Consider the Diymore for flexible local controls only after confirming its listed 220V supply matches your greenhouse setup.”
BN-LINK Digital Cooling Thermostat Controller Outlet Switch
The BN-LINK Digital Cooling Thermostat Controller is the focused choice in this group: it switches cooling equipment such as exhaust fans, rather than controlling a heater too. Its 40–108°F range, probe, LED status indicators, and three-button panel make the operating setup easy to read at the controller. Compared with the DIGITEN DTC151, it gives up heating control and a much broader temperature range, but it may suit a greenhouse that only needs fan-based heat relief. Its 1000W, 8.3A limit is also lower than the 15A DIGITEN, so load compatibility matters. The cord and probe provide some placement reach, though neither adds remote monitoring. I’d choose it for a dedicated cooling circuit, not as a year-round controller for both heating and cooling.
Pros:- Purpose-built for controlling cooling devices such as exhaust fans
- LED indicators show cooling and power status
- Fahrenheit and Celsius display options
- Includes a temperature probe and nearly four-foot power cord
Cons:- Cooling-only control does not operate heating equipment
- Temperature range is narrower than the DIGITEN DTC151
- Maximum load is limited to 8.3A and 1000W
Best for: Greenhouse growers who need a straightforward controller for an exhaust fan or other cooling device and do not need automated heating.
Not ideal for: Growers seeking one controller for both heaters and coolers, or those whose cooling equipment exceeds 8.3A or 1000W.
- Model:BNQ-T7B(C)
- Control type:Cooling
- Temperature range:40–108°F
- Voltage:120VAC, 60Hz
- Maximum load:8.3A, 1000W
- Power cord length:3.94 ft
- Temperature probe length:4.92 ft
- Certification:ETL listed
Our verdict“Choose the BN-LINK if your greenhouse needs simple fan or cooler control and no heating function.”
INKTEM Digital Temperature Controller for Heating and Cooling, 110–230V
The INKTEM TC01 makes the most sense for a greenhouse that needs both heating and cooling equipment controlled from one unit. Its two independent outlets let you assign those jobs separately, while the dual display shows current and target temperatures together—a practical advantage over simpler outlet thermostats such as the BN-LINK Digital Cooling Thermostat Controller Outlet Switch. A 180-second compressor delay can reduce rapid cycling when cooling equipment is connected, and programmable high- and low-temperature alarms add a warning if conditions stray from your limits. The tradeoff is that its stated load changes with the input voltage, and the supplied details do not specify probe accuracy or temperature range. Compared with the Inkbird ITC-308 and IHC-200 set, it handles temperature only, not humidity.
Pros:- Two independent outlets support separate heating and cooling equipment
- Shows current and set temperatures at the same time
- Compressor delay helps limit rapid cycling of cooling equipment
- Programmable high- and low-temperature alarms
Cons:- Maximum load depends on whether it is connected to 120V or 230V power
- Temperature probe accuracy and control range are not specified
- Does not control humidity like the Inkbird ITC-308 and IHC-200 set
Best for: Greenhouse growers who want separate heating and cooling equipment switched by one controller and value temperature alarms.
Not ideal for: Growers who need humidity regulation, documented probe accuracy, or a clearly stated temperature range before buying.
- Model:TC01
- Input voltage:120V AC, 60Hz or 230V AC, 50Hz
- Maximum load:10A; 1200W at 120V or 2300W at 230V
- Outlets:2
- Compressor delay:180 seconds
- Display:Dual digital display; Celsius or Fahrenheit
- Alarms:Programmable high- and low-temperature alarms
- Mounting:Wall-mountable or tabletop
Our verdict“Choose the INKTEM TC01 if you want one temperature controller for separate heating and cooling devices, but skip it if humidity control or detailed probe specifications matter.”
Inkbird ITC-308 Temperature Controller and IHC-200 Humidity Controller
The Inkbird ITC-308 and IHC-200 set is the standout choice here for growers managing two linked greenhouse conditions: temperature and humidity. Each controller has dual power outlets, so you can connect appropriate equipment for heating or ventilation on the temperature side and humidifying or dehumidifying on the humidity side. Calibration and adjustable high- and low-level alarms offer more control than the temperature-only INKTEM TC01 or SENSTREE DTC310. That broader coverage has a practical cost in setup: the set does not provide the heater, fan, humidifier, or dehumidifier, so you need compatible equipment and space for two controllers. Its listed specifications also give less detail about operating range and load capacity than some standalone thermostat listings. This is the more capable greenhouse climate option, but not the simplest plug-in temperature switch.
Pros:- Controls both temperature and humidity
- Two power outlets on each controller support separate equipment
- Calibration support allows sensor readings to be adjusted
- Adjustable high- and low-level alarms
Cons:- Requires separate heating, ventilation, humidifying, or dehumidifying equipment
- Two controllers take more setup space than the single-unit INKTEM TC01
- Provided specifications do not state load capacity or control ranges
Best for: Greenhouse growers who already own, or plan to install, separate heating, ventilation, humidifying, and dehumidifying equipment.
Not ideal for: Buyers who only need a basic thermostat outlet, want a single compact controller, or need a stated load limit before choosing equipment.
- Included controllers:ITC-308 temperature controller and IHC-200 humidity controller
- Part number:ITC308+ITC200 US
- Voltage:120V
- Outlets:Two on each controller
- Display type:LCD or LED
- Calibration:Supported
- Alarms:Adjustable high- and low-level alarms
- Item weight:1.01 kg
Our verdict“Pick this set when your greenhouse needs coordinated temperature and humidity management; choose a single temperature controller if you only need heat or cooling switched.”
SENSTREE Waterproof Digital Temperature Controller, 110V, 10A, 1100W
The SENSTREE DTC310 is a good fit when a greenhouse controller may encounter splashes or damp conditions and you want a compact plug-and-play unit. Its IP65 waterproof body and sensor are the main distinction from the INKTEM TC01, which offers separate heating and cooling outlets but does not list a waterproof rating. A large LCD with °C/°F display makes readings easy to check, and the stated 10A, 1100W capacity gives buyers a usable load reference for suitable equipment. The tradeoff is limited published performance detail: the listing does not specify control accuracy or the temperature range, making it harder to judge suitability for sensitive crops or precise setpoints. Compared with the DIGITEN DTC310, SENSTREE emphasizes waterproof construction, while DIGITEN provides a stated operating range and high/low alarms.
Pros:- IP65-rated waterproof body and sensor
- Plug-and-play design for straightforward setup
- LCD displays temperatures in Celsius or Fahrenheit
- Suitable for heating and cooling applications
Cons:- Temperature control accuracy and range are not specified
- Listed power capacity is 1100W
- Provided details do not list alarms or a compressor delay
Best for: Growers who need a compact, splash-resistant controller for compatible heating or cooling equipment in a damp greenhouse area.
Not ideal for: Growers who need a documented temperature-control range, specified accuracy, alarms, or a higher stated power capacity.
- Model:DTC310ZJ-JP
- Voltage:110V or 220V
- Current:10A
- Power:1100W
- Display:LCD; °C/°F
- Operating temperature:120 °C
- Dimensions:5.39 × 2.56 × 1.1 in
Our verdict“Choose SENSTREE for a compact waterproof controller with a clear load rating, but favor the DIGITEN DTC310 if a stated temperature range and alarms matter more.”
DIGITEN DTC310 Waterproof Digital Temperature Controller, 10A
The DIGITEN DTC310 earns its place for growers who want a clearly stated temperature range and visible alerts rather than a controller whose limits are left unspecified. It covers -40°F to 248°F, has a waterproof sensor probe, and adds high- and low-temperature alarms plus a compressor delay setting. Those details make its capabilities easier to judge against the SENSTREE DTC310, which lists an IP65 rating but does not give a control range or accuracy. The DIGITEN does have a placement caveat: its listing recommends hanging the controller for better water protection, so waterproof construction should not be treated as permission to leave the unit sitting in water. Its 10A rating is stated, but the provided specifications do not give a wattage limit. Choose it for range and alerts; consider the INKTEM TC01 if separate heating and cooling outlets are more useful.
Pros:- Wide stated range from -40°F to 248°F
- Waterproof housing and sensor probe
- High- and low-temperature alarms
- Illuminated LED display and compressor delay setting
Cons:- Controller should be hung for better water protection
- Wattage limit is not stated in the supplied specifications
- Does not offer the INKTEM TC01’s two independent outlets
Best for: Greenhouse growers who want a wide stated temperature range, waterproof probe, and high- and low-temperature alerts.
Not ideal for: Buyers who need a stated wattage limit, humidity control, or a unit they can leave exposed to standing water.
- Model:DTC-310
- Temperature range:-40°F to 248°F (-40°C to 120°C)
- Current:10A
- Display:Illuminated LED
- Sensor:Waterproof sensor probe
- Alarms:High- and low-temperature alarms
- Compressor delay:Setting available
- Warranty:12 months
Our verdict“Choose the DIGITEN DTC310 if its broad stated range and alarms suit your greenhouse, and mount it away from standing water.”
How We Picked
I ranked these controllers around the tasks greenhouse growers actually need to manage: switching heat or ventilation at set temperatures, reading conditions from a useful probe position, and handling the electrical load of the connected equipment. I gave more weight to clearly stated dual heating-and-cooling control, practical probe reach, usable controls, and features that help with day-to-day operation, such as Wi-Fi or memory. Where a product listing identifies a waterproof design, I treated that as a useful distinction, not proof that the entire installation can safely sit in wet conditions.
The order reflects fit across common greenhouse setups, not a claim that one model suits every grower. Versatile dual-output controllers rank ahead of simpler single-purpose options for most users; models with remote access or specialized environmental control earn a place for buyers who need those functions. I also factored in tradeoffs: app dependence, limited functions, capacity limits, and uncertainty about protection from moisture. Buyers should confirm their appliance’s running and startup load, supply voltage, plug type, and placement requirements against the manufacturer’s specifications before choosing.
Factors to Consider When Choosing Best Greenhouse Temperature Controllers
Controller features matter only when they match the greenhouse equipment and conditions they will manage. I’d settle the practical details first—what needs switching, where the probe can go, and how damp the installation gets—then compare app access and extra functions.
Match the controller to the job: heat, cooling, or both
Write down every device you expect the controller to switch: a heater, exhaust fan, cooling unit, or more than one of these. A dual-output thermostat can manage heating and cooling around separate setpoints, but its outlets do not automatically make a system safe from conflicting equipment cycles. A single-function outlet can be a good match for one heater or fan, especially if you already have a separate control for the other task. Avoid buying by the word “thermostat” alone; confirm whether the model offers heating mode, cooling mode, or independent outputs. If your ventilation fan must also respond to humidity, a temperature-only controller will not replace a humidity control.
Check electrical load, startup demand, and outlet compatibility
Compare the controller’s voltage and maximum load with the appliance label, not just the controller headline rating. Motors and compressor-based equipment can draw more current at startup than during normal operation, so a nominal wattage match may not tell the whole story. If the load is close to the controller’s limit, ask the equipment manufacturer or a qualified electrician whether a properly rated relay or contactor is needed. Check plug style and supply voltage as well; a controller that fits the outlet may still be unsuitable for the greenhouse circuit. Never use an adapter or extension arrangement to bypass a load or grounding restriction.
Place the probe where it reads the plants’ conditions
A thermostat responds to the temperature at its probe, which may differ from the temperature near a heater, roof vent, doorway, or sunlit wall. Position the sensor near the crop zone, shielded from direct sun and direct airflow from equipment, so the controller is not reacting to a misleading hot or cold pocket. Probe length determines how much freedom you have to place the controller body outside the growing area while keeping the sensor where it belongs. A longer probe can help with layout, but it does not correct poor placement. Before mounting anything permanently, compare readings at plant height with a separate thermometer across sunny and cool parts of the day.
Treat moisture protection as an installation issue, not just a product feature
Greenhouses combine condensation, watering, and temperature swings, so the location of the controller matters as much as its stated enclosure or probe protection. A waterproof probe does not mean the display, plug, outlet, or connected appliance is waterproof. Mount electrical components above likely splash and flood zones, keep connectors dry, and use protection appropriate to local electrical rules. Drip loops and suitable enclosures can reduce water exposure, but they cannot make an unsuitable device safe outdoors. If the controller will sit in a persistently wet area, choose equipment rated for that setting and seek qualified installation advice.
Decide whether remote access is worth the added complexity
Wi-Fi can help when the greenhouse is away from the house or when you want to check readings without walking out to the structure. It is less valuable if the signal is unreliable, the controller must work through a network outage, or you prefer local adjustments. Before relying on app alerts, check what the unit does when the internet or router is unavailable and whether its settings remain stored after a power interruption. Memory features can reduce setup work after an outage, but they do not replace a backup plan for sensitive plants. For critical crops, pair remote monitoring with an independent thermometer or alarm rather than trusting a single connected device.
Set a realistic temperature band and plan for failures
Frequent switching often comes from setting heating and cooling thresholds too close together or placing the probe in an unstable location. Choose a temperature band suited to the crop and allow enough separation between heat and ventilation setpoints to reduce rapid cycling. Think through what happens if power fails, a sensor becomes disconnected, or a heater runs continuously; a thermostat is a control device, not a complete safety system. Use equipment with appropriate overheat protection and follow its installation instructions. For valuable or cold-sensitive plants, a second temperature check and a clear response plan can matter more than extra app features.
Frequently Asked Questions
Can one controller run both a greenhouse heater and an exhaust fan?
Some dual-output controllers can switch heating and cooling equipment separately, while single-outlet models generally handle only one controlled load at a time. Check the controller’s modes and outlet behavior rather than assuming two sockets mean two independent temperature rules. Confirm that the heater and fan each stay within the permitted electrical load, including startup demand. Set distinct heat and cooling thresholds so the devices do not work against each other. If either appliance has special control or wiring requirements, follow its manual or ask a qualified electrician.
Is a Wi-Fi temperature controller reliable if the greenhouse loses internet access?
Wi-Fi loss and internet loss are different: some controllers can keep running their local thermostat function even when remote access is unavailable, but behavior varies by model. Check the manufacturer’s instructions for offline operation, retained settings, and what happens after a power cut. Do not rely on phone access as the only way to detect a heating or cooling failure. A separate thermometer or alarm provides a useful check if the greenhouse holds valuable plants. Test the controller’s offline behavior before leaving it to manage conditions unattended.
How do I know whether a controller can handle my greenhouse heater?
Read the heater label for voltage, current, and wattage, then compare those figures with the controller’s stated limits. For motors, compressors, and other inductive loads, startup current may exceed the normal running draw, so a simple wattage comparison may not be enough. The controller must also match the outlet and circuit used in the greenhouse. Do not exceed any stated rating or assume a higher advertised wattage makes every appliance compatible. When the load is near the limit or the manual is unclear, consult the heater maker or an electrician.
Does a waterproof temperature probe make the whole controller safe in a damp greenhouse?
No. A probe’s water resistance applies to the sensor, not automatically to the display housing, plug, socket, or connected equipment. Keep electrical connections away from irrigation spray, condensation drips, and places that could flood. Use a suitable enclosure and installation method for the actual exposure, following local electrical requirements. If a product listing does not state a protection rating for the controller body, do not assume it can be exposed to moisture. The SENSTREE and DIGITEN DTC310 are the lineup’s waterproof-oriented options, but placement still matters.
Should I choose a temperature-and-humidity setup instead of a temperature-only controller?
Choose humidity control when moisture levels are a separate management problem, such as when you need to operate a humidifier or dehumidifier based on humidity readings. A temperature controller alone cannot respond to that variable, even if you use it to switch a fan. The Inkbird ITC-308 with IHC-200 pairing is the most direct fit in this roundup for managing both temperature and humidity. It also means more equipment, settings, and electrical connections to check. If your only goal is to switch a heater or ventilation fan at a temperature threshold, a temperature-only model is simpler.
Conclusion
For most growers, I’d choose the Inkbird WiFi ITC-308 as the best overall because its dual heating-and-cooling control and remote access cover more common greenhouse tasks than a basic outlet thermostat. The WILLHI WH2408 is my best value-style pick for buyers who want a straightforward digital controller and do not need Wi-Fi; the DEWENWILS Smart Temperature Controller is the premium-leaning choice for growers who prioritize connected control and memory features. Beginners can start with the Inkbird ITC-308 Digital Temperature Controller if they prefer local operation without app setup. For specific needs, choose the SENSTREE or DIGITEN DTC310 when a waterproof-oriented design matters, or the Inkbird ITC-308 and IHC-200 pairing when humidity control belongs in the plan. Before ordering, match the controller’s ratings and modes to your equipment and greenhouse conditions.
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