The Diymore Digital Thermostat Temp Controller is a plug in outlet with a wired temperature probe that switches a connected device on and off at the temperatures you set. Plug in a heater, fan, heat mat, or cooler, and the controller holds a space within your chosen range automatically.
It also has cycle and countdown timer modes for devices that run on a schedule. It fits greenhouse growers, poultry keepers, and anyone looking for outlet thermostats for heating or cooling equipment. The thermostat and timer functions run one at a time, so you choose the mode that fits each job.
Specifications
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Control Type: Plug in thermostat outlet with external temperature probe
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Temperature Range: -40°F to 248°F
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Accuracy: ±1%
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Thermostat Control: User set start and stop temperatures for heating or cooling devices
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Timer Modes: F01 cycle timer, F02 countdown on, F03 countdown off, and F04 countdown on and off
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Timer Range: 0 to 99 hours and 59 minutes
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Additional Functions: Temperature calibration and reset
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Memory: Retains settings after a power outage
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Display: Backlit HD LED display
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Probe Cable Length: 1.7 meters (about 5.6 feet)
Automating Greenhouse Heaters, Ventilation Fans, and Heat Mats by Temperature
If you are running a greenhouse heater through winter and want it to kick on only when temperatures approach freezing, this controller handles that without you adjusting a dial every evening. You can set it the other way for summer, turning on circulation fans when a space heats up and shutting them off once it cools.
It also works for seedling heat mats, where steady root zone warmth matters more than air temperature. The 5.6 foot probe cable lets you place the sensor at plant level or away from the heater, so the controller responds to the air you actually care about rather than the warm spot next to the heat source. Because settings stay in memory through power outages, the controller resumes on its own after the power comes back.
What to Expect from the Diymore Digital Thermostat Temp Controller in Real Use
Purchasers use it to keep a hobby greenhouse and an RV just above freezing with an oil radiator heater, to cycle fans in a chicken coop, and to hold an outdoor shelter near 50°F with a ceramic heat emitter set to start at 45°F and stop at 55°F, even during snow.
Others run room fans, and an owner controls a crockpot for culturing yogurt. Reports describe it holding within about half a degree of the set point, and calibration checks matched other thermometers. Several owners have run it daily through a full winter without problems.
Setup is generally described as easy, though it takes some trial and error to dial in start and stop points for your equipment. Some found it confusing at first that the thermostat and timer can't run together, and an owner couldn't work out how to switch the display to Fahrenheit. Placing the probe away from heaters and walls gives a more representative reading. The backlit display is easy to check at night.
Real-world performance notes sourced in part from verified Amazon customer purchases.
Frequently Asked Questions
How do you set a plug in thermostat for heating or cooling?
You set a start temperature and a stop temperature. For a heater, set the start temperature lower than the stop temperature, for example on at 45°F and off at 55°F, so the heater runs until the space warms up. For a fan or cooler, set the start temperature higher than the stop temperature, so the device turns on when it gets warm and shuts off once the space cools. A narrow gap holds temperature tighter, while a wider gap reduces how often the device cycles.
Can you use the Diymore thermostat and timer at the same time?
No. The thermostat and timer functions cannot run simultaneously. Use thermostat mode when a device should respond to temperature, such as a greenhouse heater or coop fan. Use one of the timer modes when a device should run on a set schedule or for a set period regardless of temperature. If you need both behaviors, you will need a second controller.
Where should you place the temperature probe on a thermostat controller?
Place the probe where it reads the conditions you want to control, not right next to the heat source. Keep it away from heaters, heat lamps, and exterior walls, and set it at plant height in a greenhouse or at animal level in a coop or shelter. This keeps the controller from shutting the heater off early because the probe is sitting in a warm pocket. Avoid submerging the probe in liquid, and keep it out of the direct spray of misters or irrigation.
