A built-in control is easier to install when the walls are already finished, but a wall-mount thermostat controls the room temperature more accurately, is more convenient to use, and offers a broader selection of models. Always mount your thermostat on inside walls away from drafts, direct sunlight, or appliances that could make the temperature reading inaccurate. If using your thermostat with a baseboard heater, put it across the room from the heater. If using a wall heater, put the thermostat on the same stud cavity as the heater on the opposite side of the stud, 5 feet above the floor. If you want to put the thermostat in a large room containing 2 or more heaters, place the thermostat in a central location.