Yes, heating consumes a lot of energy. On the other hand, most buildings even in fairly cool climates are absolute sieves when it comes to energy efficiency, mo

Yes, heating consumes a lot of energy. On the other hand, most buildings even in fairly cool climates are absolute sieves when it comes to energy efficiency, mostly because energy has been artificially cheap, historically. It's possible to construct buildings that require very little heating, but of course turning all the existing buildings into Passivhäuser overnight is not really a reasonable proposition.