How much do you spend to heat S&B over the winter. Update

pawatt wrote:
Sounds like it should work and reduce that heating cost quite a bit.

It just came to me though that wouldn't help much if you had to start spending the winters there. We used to keep our thermostat at 66 degrees when we were home, then 68, then 70, now we are cold unless we keep it at least 72 degrees.