It is time to replace my forced air heating/cooling system.
Is there a formula for calculating the savings, if any, for converting from Nat Gas to a Heat Pump. I have a bid for a new system and the price is almost identical for either system (the HP slightly less).
Extra information: I installed 8kW of solar on my roof in December/11 and it has more than halved my winter electrical use which is very high as a run my business from my home.
Extra information: I live in San Jose, CA and the coldest it gets is the mid 30s (2 or 3 days/year) and the highest it gets in mid 90s (5 or 6 days/year)