[Daryles]

It should not take that long to warm up your rig. When you get a chance, take down your basement wall and look for pinched, cut, disconnected air ducts.
Last week we went from Goshen Indiana to Watson Illinois. It was in the 30*F. Dropped into the 20s. When we arrived at Watson for overnight stop we turned on the furnace, fireplace and electric space heater (50A hookup). We also turned on the oven for a little while. It warmed up pretty quick. They were predicting freezing rain. We pulled all the slides in and left the TV hooked up so we would not have slides frozen in place (extended) and an iced over hitch. Keep an eye on your propane tanks. It can go pretty quick at those temps. We use Mopeka tank monitors.