Wanted someway to heat without any type of fuel due to gas and propane for the generator. Found this electric heater. I believe it’s temperature controlled. At least 40 degrees is what I need. Really easy to install and wire. If you have any doubts, get a pro. This is a 220 heater and has to be wired right and safely. Please read all the instructions and information on this heater. Not following instructions can lead to a fire. Like I said, if you have any concerns, get a pro, they really don’t charge that much for safety.