This very much depends on how you do the heating / cooling. An efficient way to heat a house is to have a heatpump plus low temperature floor heating (and cool

This very much depends on how you do the heating / cooling. An efficient way to heat a house is to have a heatpump plus low temperature floor heating (and cooling). This system works best by keeping the floor at a constant temperature, day and night. Of course, a house also needs to be properly insulated and have ventilation with heat recovery