I'm in the same boat as you, cageybee. I have an automatic thermostat that is set at 62° when I'm not home or when I'm sleeping. However I tested a bunch of rooms upstairs and found that our guest bath stay in the 67°-72° range all day and night if I keep the door closed. Takes about 2 weeks to get a little carbonation and 4 weeks to be complete. The wife isn't exactly happy that the bathroom is now full of beer carbing up, but hey, it works!