I heat with a propane furnace, augmented with a wood airtight stove in the Pacific Northwest. We burn about 2 or 3 cords of wood per year to help out the furnace. Propane is creeping up in price... we had a $500 bill for one two month period this winter (including domestic hot water and clothes dryer). It usually costs about $300 per two or so months in winter months and $100 in the summer months.
The winters here are pretty mild... mostly around 40F with a couple of "Arctic Blasts" in the 20's or 30's each year. The house is 1750 sq ft and the well insulated. It has a Rheem furnace installed when the house was built 11 yrs ago. We have no air conditioning and rarely need it (maybe 10 days per year).
Any suggestions? I don't know whether we should upgrade our system or not.