Not fundamentally difficult. It's called "insulation". Difficult to economically retrofit in many cases, however. That 1937 farmhouse with minimal insulation and originally fitted with a coal-burning boiler, will be hard to adapt into a highly insulated, tight-envelope modern house with a heat pump.
pdp10 t1_j1ilbpf wrote
Reply to comment by zenzukai in Canada moves to mandate electric vehicle sales starting in 2026 by rentalfloss
> hard to do for heating.
Not fundamentally difficult. It's called "insulation". Difficult to economically retrofit in many cases, however. That 1937 farmhouse with minimal insulation and originally fitted with a coal-burning boiler, will be hard to adapt into a highly insulated, tight-envelope modern house with a heat pump.