This is partly solved with a right-sized furnace. A well insulated house with a huge furnace will run the furnace for two minutes an hour. Whereas a small furna

This is partly solved with a right-sized furnace. A well insulated house with a huge furnace will run the furnace for two minutes an hour. Whereas a small furnace might run forty-five minutes an hour. The overall gas usage will be the same, or maybe even lower, and there is significantly more even heating & mixing.