For cold-weather power outages, I keep a supply of UniHeat shipping packs on hand - they're for shipping plants, chick, reptiles, etc. If you have Amazon Prime you should have time to order and receive them before the outage.
If not, you should be OK if you can fill plastic bottles with hot water right before the outage and put them in the enclosures. And/or you could try the hand warmers that you can buy in drug stores or sporting goods shops, but BE CAREFUL with those, as they get really hot. Stick them into a sock or something before putting them in the enclosure.
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