Review on DIGITEN DTC101 Digital Temperature Controller - Greenhouse Thermostat Plug for Heater, Heat Mat, Aquarium, Reptile Incubation, Homebrewing - Heating & Cooling Mode by Michael Wiley

Setting to control the fan in my greenhouse. Initially I had cutoff temp and cutoff temp too close (within a degree Fahrenheit). Because of this, the fan turned on and off too often. Set the on and off temperature with a difference of at least 5 degrees. Also, place the remote temperature sensor at the height of your plants in the greenhouse. If you install the sensor high up in the greenhouse, the fan will run more than usual (the heat is rising and the top of my greenhouse is 10 degrees warmer than the benches the plants are on). In general, the device is accurate, durable and comfortable.