I'm a newbie to RV's. We have a 2013 Sunset Trail ST30RK with an Atwood furnace and Dometic Thermostat that controls Fan, AC and Furnace functions. It's getting chilly here in CT and we have guests coming to stay in the trailer so thought I'd try out the furnace. I set the thermostat to Furnace, set a temperature quite a bit higher than what it was (trailer was 60, I set temp to 76) and it came on just as it should. In a minute or two it was blowing warm air from the floor registers. Strangely though the AC fan came on at the same time. Is that normal? There was air coming out of the ceiling AC vents, not cold air, just seemed to be room temperature air. Is something wrong? Do I need to have someone look at it or is this how it's supposed to work? The AC is a Furrion if that is any clue. It was originally a Dometic AC but the former owner replaced with a Furrion.