Derek Cole explains why lowering your thermostat when you leave home doesn't always save energy. If your house sits at 78°F all day, cooling it back to 75°F at 4 or 5 PM during peak heat means your AC works harder than if you'd kept it cool the whole time.
I'm against sitting it back too much when you're going to work. The problem is, you know, you get home at 5:00 or 5:30 and everybody tries to bring it down to the temperature they want. Well, it's been sitting all day at 78 degrees. It's going to be hard for it to get to 75 when it's the hottest part of the day at 4 or 5 o'. Clock.
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