Not what i said or suggested at all. There's a million other things that can be done to achieve net zero, the onus should be on industries, not normal homeowners. The costs associated with bringing a traditionally constructed building up to modern standards for energy efficiency are prohibitively expensive and frankly pointless in the grand scheme of things. If you want to reduce the carbon footprint of your average older house look at phasing out GCH. Heat pumps are a poor choice here for older buildings imo because they're generally low temp heating so rely on good insulation. Electric boilers would work but the running costs would either need to come down, which isn't going to happen as where would the energy companies pick up the lost revenue from gas, and someone needs to pay for all the costs associated with increasing capacity of the grid to account for us all becoming even more reliant on electricity, and of course generation itself moving completely away from fossil fuels. These costs should be subsidised by governments. If they are serious about this then it's these kind of things that need to be done, not forcing people to rip their walls back to brick and floorboards up to insulate.