The girl and I were leaving for a short weekend getaway Saturday morning, set for a return late Sunday afternoon. We usually keep the air on about 71 degrees in the summer. Since we would be gone for more than a day, one of us wanted to turn the air up to about 78-79 degrees to save some money. Then, we would turn it back down to 71 when we got home the next day. The other only wanted to turn it up to about 73, and said that it uses more electricity to turn the air back down when you get home if you have it turned up to 78-79, since it has to work so hard. I'm not disclosing who argued what. So who is right? What is a more efficient strategy?