Factory installed furnace doesn't seem to run all night. It will run hot for a while and then we wake up at night and it is just blowing cold air. It started blowing cold air sometime around 2am because that is when I woke up to turn it off because it seemed to be making us colder because of it. Would this happen if we run out of propane? Later that day we ran out of propane while cooking breakfast (I was expecting to run out since it was low anyway when the trip started) This is my first popup and I'm very DIY.