You’ve probably heard this advice before regarding the best way to run an air conditioning system: you should set your air conditioner to stay on all day (at a high temperature, such as the upper 70s) while you’re away from home, rather than leave it off and turn it on only when you get back home. The logic behind this piece of advice is that this 1) makes it easier to quickly cool down the house when you return, and 2) uses less energy, because an air conditioner drains more power at start-up than when running regularly.
But is this actually true?
