I am considering having a heat pump installed in our single family home. Right now we have oil fired baseboard heat and a forced air AC. Last year I spent ~$3k on oil....so I find it easy to justify some up front cost to lower the overall heating bill. Geothermal is too much up front(~$40k), natural gas costs too much to have the lines run to our house (~$70k) so the only real alternative for me is a heat pump. So my question is....can a new heat pump be integrated into the existing forced air system? Does it make sense to leave the oil burner in place as a backup when the temps go below 40F? What is a typical heat pump system cost? As I know nothing about these things, is something like Sears installing it a really dumb move? Thanks for any advice offered.