> Is your $0.30-0.40/kwh rate based on your Solar cost?
It's just out of date from the math I did two years ago, I should have mentioned that.
> heat pumps are too expensive to operate with CA electrical rates.
It depends on your furnace. Typically it's going to be 80AFUE. $2.54/therm is $0.087/KWh-gas. If you pay $0.42/KWh-electricty, a heat pump with a COP >= 3.7 saves you money. Heat pumps with COPs above that at bay area temperatures are widely available.
If you have a 96AFUE furnace, the necessary COP is 4.6. That's a lot harder to find: I'm no expert on the heat pump market, but it seems like the standard units are mostly 3.5-4.0. I can find mini splits up to 4.5 (like [1]), but they're more expensive.
It's just out of date from the math I did two years ago, I should have mentioned that.
> heat pumps are too expensive to operate with CA electrical rates.
It depends on your furnace. Typically it's going to be 80AFUE. $2.54/therm is $0.087/KWh-gas. If you pay $0.42/KWh-electricty, a heat pump with a COP >= 3.7 saves you money. Heat pumps with COPs above that at bay area temperatures are widely available.
If you have a 96AFUE furnace, the necessary COP is 4.6. That's a lot harder to find: I'm no expert on the heat pump market, but it seems like the standard units are mostly 3.5-4.0. I can find mini splits up to 4.5 (like [1]), but they're more expensive.
[1] https://www.homedepot.com/p/GREE-Sapphire-9000-BTU-0-75-Ton-...