One of my friends that was married to the comptroller of a major company. She made good money and he made good money. They lived in a very nice neighborhood. She was VERY tight with their money. She insisted they keep the house AC set for 79 degrees in the summer. He was just sweaty all the time at home. He figured what is good for the goose is good for the gander. They kept the house at 45 degrees in the winter. He said one day he could see his breath in the kitchen. She just moved into the bathroom and virtually lived in there. It was all a matter of seeing who would break first. I told them both the were nucking futz.
One day the gas company came out to replace the gas meter because every other house in the area had gas bills in around a 100 to 200 bucks. Theirs was just the minimum fee. The gas guys came inside and saw how cold it was but they changed the meter anyway. It was the same amount the next month.
They finally decided on a compromise temperature in the house.