To comment #3, MR. “upper management in the propane industry for over 30 years” Your costs for heat pump heating are 100% vauge! I have a 1700 sq ft single family, built in 2002. The house in entirely electric! During winter 2010 we had a electric billing month of 30 days with 20+ days of tempuratures BELOW FREEZING! My heat pump heated house was only $266! I keep the day temp around 69 and night temp at 67. If you are going to quote a heating cost/mo you must state the house size and age and heating tempurature as well as the outside air temp!