It can be good or bad depending on what's driving the change. Improving efficiency, assuming it comes at a reasonable cost, is generally good.
If people are just going without, then that's generally bad.
If people are just going without, then that's generally bad.
Sometimes that's fine if you're just reducing waste. However other times it could mean that you can't keep your house at a reasonable temperature because you can't afford to run your heater/air conditioning enough. That's a form of going without.