And some countries already are. For example, in Lithuania there are subsidies (~40% of installation price) for replacing gas, wood or coal furnaces with heat pu

And some countries already are. For example, in Lithuania there are subsidies (~40% of installation price) for replacing gas, wood or coal furnaces with heat pumps. (Also subsidies for installing solar panels and batteries too.) It's just that... Theres so many households and only so few manufacturing/importing/installing capabilities. And the subsidies aren't limitless too :-)