Stan,
I have lots of experience with propane heating. In fact, we just put a new Empire FAW55IP Up-Vent Wall Furnace. Ordered it online from propaneproducts.com in Wisconsin, $1306 with all the parts and shipping. Installed fairly easily with few problems. I picked the “IP” because I did not want a standing pilot light. Having worked on the big boilers at the Pentagon and installed HVAC controls for several years, I trust the new electronic flame sensors. Plus, I won’t be paying for the propane consumed by the standing pilot light.
The old furnace output was rated for 45,000 BTU and when it was well below zero it could not keep the pipes from freezing. So this time I upper the output to 55,000 BTUs. Hopefully it can hold the house and keep the pipe from freezing. Of course it can’t do anything with power – one of my other problems.
The vented units have a lower efficiency rating, BUT as BEENTHERE has already stated, no moisture in the house. BTW, if you can, get natural gas. It’s about 4 time LESS expensive than propane - per MMBTU (DTH)(million BTUs).
Bruce