Second point has no point, heat pumps are overhyped on expensive electricity, accumulator tanks still need be heated up by something. Lot's of energy must be sp

Second point has no point, heat pumps are overhyped on expensive electricity, accumulator tanks still need be heated up by something. Lot's of energy must be spent. 3 point is silly, such "houses" have massive thermal inertia, it's gonna take a while to heat those rooms when you start using them and heat is gonna "bleed" internally anyway. It will cost you a lot anyway, can't escape entropy.