I tend to spend a bunch of time out in the garage but lately it seems, not much gets done. It is heated (natural gas) and I leave the thermostat set on 70 steady. It's REALLY well insulated and since the only door that gets opened 99.9% of the time in the winter is the human door, not much heat loss. Figured it out once, in the coldest month (temps between -20 and +10) it took roughly $15 of gas to keep a constant 70 degrees. This is the big garage out back. The one car attached garage is heated but,,,,,,,,I rarely turn it on because it's electric (came with the house). The little disc on the electric meter almost grenades from the centrifugal force, lol. Plus, it's not insulated anywhere close to the other garage. Spring can't get here soon enough IMO.