Just better building standards will get you a long way. I live in a house with rather poor energy rating by Swedish standards (E on an A to F scale), yet with 4

Just better building standards will get you a long way. I live in a house with rather poor energy rating by Swedish standards (E on an A to F scale), yet with 4 people and some sunshine we keep 75m2 (half the house) heated to 20c with -5c outside.