Are you talking about doing that if the power goes out? That's about the most difficult thing you could do, plus you have to have a gas stove if you are talking about in a power outage.

Two easy things, get some heat packs, hand warmers, etc. Or fill water bottles with the hottest water out of your tap, do not put them in the tubs or directly under the tubs. If I have a power outage I pack up all the snakes and put them in my incubator. Then I fill up water bottles with hot water and put them in my incubator, an old fridge. It keeps them at 80-85 degrees for about 8 hours.