We recently bought a house in Cherry Hill, NJ (just outside of Philly). The house has a 4 year old 80% Gas furnace, and an ancient Air Conditioner that doesn't work anymore. Since the furnace is only 4 years old I'm not planning on replacing it. I got quotes from a few different installers, and none of the mentioned heat pumps, however I asked the last one if it was a good idea. She said it was a good idea and could end up saving us alot of money (of course I then wonder why if it was a good idea she hadn't mentioned it).
It was only about $300 more for the Heat pump (4TWX4036B1000A vs 4TTX4036B1000A), and although I don't have any way to tell, and have been unable to find enough information to calculate it, it seems likely it would easily be worth the extra $300. However the problem is that there is a $300 rebate on the Air Conditioner, but not on the heat pump. I didn't really understand why, since the NJCleanEnergy website says that it only has to have a HSFP of 8.5, and Trane's website says it has a HSFP of 9. This means that the differance is at least $600, which I'm not sure I'd be able to recover.
I've tried a few online calculators (including the HVAC OpCost one) and haven't really gotten any satisfactory answers, so does anyone have any better way to calculate it?