I'd suggest to not lower your house temperature down to subfreezing. You might have a lot more to worry about than a few cans of paint. Every year up here in MN, a snowbird turns their heat off with disastrous results, usually a broken water pipe.
The other things that can happen are framing separating, wall coverings failing, appliances breaking, etc. If you can afford the trip South, budget in a few bucks each month for heat. You won't have to keep it 70f inside but should research a reliable temperature to keep it at.
BTW, this year is predicted to be mild and fuel costs are down so both of those should work in your favor.