Dear god! 78-80? Wow. We keep the heat in our house around 60-63...and I'm one of those people who is always cold. Going to sleep when cold is a problem. Solution: cats, DH (who makes a fantastic space heater), microwaveable heating pad in bed with me, or taking a hot shower/hot bath right before bed. Works every time. I can't imagine keeping the heat at 78-80.