I am in the heating business. Every structure has a given heat loss, determined by inside desired temperature and outside temperature....If you want 70 degrees inside and it is 30 degrees outside, you need to produce enough btu's inside to keep up with the heat loss outside. That is physics...can't change it. The only way to cut down on heat loss to the outside is to create more insulation to slow the heat loss process...more efficient heating systems help with reduced power generation, gas, electricity, solar water or electric, but it does not stop heat loss to the outside environment. The only way to cut down on total Btu/Hr heat loss to the outside is to lower your thermostat so the delta-t between inside and outside is a lower factor.