>In DACH, there's not really an alternative for many homes.
And yet in Austria, most apartment buildings in big cities are still heated by burning heating oil, gas or even firewood. Worst of the worst for air quality.
Walk through Graz in sub-zero winters and it's like you're breathing in a barbeque bonfire. Even your clothes smell like soot when you get home if you've been out too long. Which is bizarre to me, considering how much posturing and chest thumping Austria is doing about how green and anti-Nuclear they are yet they love burring wood and oil. Male this make sense please.
Sure, rich people in the bacon belt living in single family homes in the suburbs or rural areas, have heat pumps, solar panels on the roof and a Tesla in the garage, but that's a different story compared to those living in the city stuck in the fossil fuel stone age, where they have no choice over their rented building's heating method.
How do you convert the city's apartment buildings to heat pumps? Is it a technological limitation? Money limitation? Bureaucratic and political limitation? All of the above?
Beurocratic and political limitation.
Firewood and heating oil isn't cheaper, it merely has lower upfront cost in exchange for a higher total cost. An efficient governance system (whether that's capitalism and banks with loans or renting out the hearpumps or a centrally planned replacement program or anything else) would figure out the financing and save the system money by updating.
Technology can make the incentives even larger. Excess money can make it easier for the governance system to reach the solution. But it's at the point where without any improvement to either an ideal system would figure out how to make the switch happen.
It's incentives. Landlord pays for the installation and decides, tenant for the operation/heating.
Best way to get around this is making heat pumps more accessible (easy to get, financing options), as well as legislation (banning gas/oil heating).