It's more expensive per unit power but heat pumps are more efficient than natural gas boilers. I can't easily retrofit, but a very high SEER heat pump comes out

It's more expensive per unit power but heat pumps are more efficient than natural gas boilers. I can't easily retrofit, but a very high SEER heat pump comes out to a similar annual cost as my existing 96% efficient natural gas boiler. But only a very high efficiency one; a middle of the road heat pump loses, partly because I have a very high efficiency condensing boiler and partly because PA has fairly affordable gas rates.