Returned from Fl yesterday...had -2 degrees at cabin today...cold! Could not get heat to run in garage. Called Chris...he was sick. He gave e some stuff to lok at. Trap for condensate from exhaust stack was frozen. I had turned the heat off while I was away... normally not a problem. Thawed out trap line and furnace runs. Let it heat overnight as it was 15 degrees INSIDE the garage. Installed replacement seat sliders from Lanciar inside cabin at 70 degress...high for the day was 14.