Yeah, that could very well be true. I dont know, I really don't think about it or dwell about it too much. All I know is 70 degrees at the thermostat is too dang warm. The thermostat is in the hallway, downstairs, away from all sunlight and vents.. so that mean it's at least 5 degrees warmer than the rest of the house. It's downright sweaty upstairs...at 66. I think the temperature is all relative depending on how your house is set up. If your thermostat is at the warmest part of your house, obviously you would heat your house warmer than someone whose thermostat is at the coolest part of the house. If I say I can feel lightheaded with the thermostat at 70 while doing my daily stuff, well, it shouldn't be up for debate. Like pps have said, if my FIL is that miserable he is more than welcome to go to a hotel- my DH works at one so he could probably get it for free, anyway. But he is just controlling- well, guess what, "I" can't really leave because I have my three kids to care for, and I am not going to take them to a hotel. It's four degrees- if that makes me a bad hostess, oh well- if that's the worst of my problems, that's ok. I don't need the anxiety, or the stress, of worrying about it!