I try and try to explain this to my 81 year old dad. There is absolutely no savings in keeping the thermostat set to 85 degrees when it's over 100 outside. He's ridiculous. He believes he's saving money. I'd just be happy if he left it on 72 or 73 so the women I pay to help with him don't call me complaining about the heat in his house.she STILL doesn't realize that turning ANY A/C system off but especially a window unit for over half the day AND during the peak heat of the day doesn't save a ****in dime. It just overworks the unit when you do turn it on.