Probably a little late, but just confirming our Tiffin did the same thing. Too cold and the furnace kicks in and brings it up to a certain temp.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)