I agree with Paul W. We haven't even tried our furnace
yet since our week in Yosemite during the summer had us begging for AC! I also have the Heater Buddy or whatever it's called which we got with our first Play Pac that already had the furnace
removed. Since I have that I haven't really done much but I'd be sure to get it inspected by a pro. I have done fiberglass and plumbing in these things but the one thing I do not mess with is propane. A water leak I can live with but after one of our good friends here lost his beloved Burro
to a propane leak/fire (luckily no one was harmed) - i decided its best to go with a professional inspection. Good luck!
- Paul c.