@Rickster1963 so using my example, right now it is too cold for the air, so we are using heat, as it still gets rather chilly at night. but like I said right now, it is almost 79 in here, the heat is on, but set at 73. so it won't kick in until it hits 72 in here, instead of me waiting until I get cold, lets say 70 or 69, and then it has to work harder to get us back up to 73. smile.