Exhaust Fan with Thermostat. Living 10 Inch Variable Speed Shutter Exhaust Fan, Wall-Mounted, 10" AC Infinity CLOUDLINE T6, Quiet 6” Inline Duct Fan with Temperature Humidity Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics. Attic Fan Thermostat, Attic Fan Control, Cooling Only, 120 to 240VAC - Programmable ... Living 12 Inch Variable Speed Shutter Exhaust Fan, Wall-Mounted, 12". Wire an Exhaust Fan to a Thermostat. A typical greenhouse uses an exhaust fan to cool off high temperatures in the room. This type of fan is equipped with a thermostat that measures room temperature and triggers the fan when temperatures rise to a certain level.