This house temperature thing is not borne out in fact. I've lived in Asia, Europe, and North America and whenever friends from the US or Canada visit us in the winter, they tell us that our house feels very cold. We keep the thermostat at 19-20C, so 66-68F, and always have to crank it up for them.
Several years ago we lost power for a week at our place in southern Florida after hurricane Wilma. No air conditioning for several days. It was a bit warm during the day, but the nights, with open windows, we're bliss!