My guess is that they will put out about the same amount of heated air. However, a heat strip blowing from a roof mounted AC unit will most likely distribute the heated air better than a ceramic heater. A ceramic combined with the air movement and extra heat from a AC controlled heat strip would be an even more effective combination. Just a clarification on propane usage. PUP furnaces do use a lot of propane compared to their water heaters and oven/grills. But, unless you are running your furnace non-stop, you will be able to get through a typical 2-4 night camping trip easily on less than a 20lb bottle of propane especially if you use the Gizmo's and other tips already mentioned in this thread. It sounds like the camper that you have or are looking at already has the AC with heat strip so the following comments will be more valuable for others reading this thread that are considering adding an AC unit with heat. I added a Carrier Air V 15,000 BTU Heat Pump (standard model) last year and couldn't be more pleased with it. Rather than the 5,000-6,000 BTU heat strips that most units have, this unit pushes 15,000 BTUs of heated or cooled air. This has virtually made my furnace useless unless I am camping without electricity. Granted, I have not camped in some of the extreme temperatures that others here on PUP have (even though God knows that I could here in ND), but I did have a spring trip last year where the temps got down to the upper 30's and it got so warm in the pup that I had to turn the temperature switch so it was right in the middle of the hot/cold settings and turned the fan to low. The only caveat is that if the temperatures get below freezing the heat pump will automatically shut off to prevent outdoor coil freeze up. But then the auxiliary 5,600 BTU heat strip (same as has been talked about in this thread) will kick in.