Almot wrote:
I think Pnichols meant - when propane furnace fails. Not really an emergency for most people, can be easily remedied with propane heater. I wouldn't be able to sleep with furnace cycling, anyway. Thick duvet is better - never fails ;)
I'd point out that most RV's come with 3 back up blue flame heaters. Otherwise known as a cook top propane stove. Not recommended for long term use--but it keeps you from freezing, so long as there is propane in the tank.
With the newer battery chemistries, solar could run an air conditioner. Some one is selling 250 watt used panels for $35 usd. $225 for a 500 watt system. Cover the roof and sides with panels.