A plurality of home and commercial heating in the US involves direct burning of fossil fuels. So even if the grid is 100% renewables, you’re talking about spending thousands of dollars per house to replace oil and gas furnaces with heat pumps.
A rapid transition would be hellishly expensive, but new installations can certainly be looking at heat pumps.
I wonder if there is a way to structure penalties/incentives so that home builders and landlords end up installing systems with lower lifetime costs (and lower environmental impact), rather than whatever is cheapest upfront.
