Depends on who you are talking about. Having no climate control to climate control will cost energy no matter how efficient the heat pump. No car to an electric car will cost energy.

For those who have all the that, the de-growth camp asks that people give up meat, down-size their houses and give up one of their cars. Maybe they should, but that will never win any popular support. The answer is always both though, we need to make things more efficient and produce more energy than ever using renewables.