You all are going to laugh at me, but when the cold weather first hit, I had the thermostat set at 69ºF and I was freezing. Jeans, two sweatshirts, thick socks, freezing. I knew I couldn't leave the thermostat on 69 forever, but I also wanted to survive the winter. And so, over the last couple of weeks, I've gradually turned down the heat and now I'm proud to say I'm comfortable at 63ºF. How low can I go?