Space blanket, down comforters, fleece blankets over the tanks/racks. The hot water bottles aren't a bad idea if you can swing it, just make sure the animals have a gradient so they can figure out on their own how close they want to be. I wouldn''t pack them in pillow cases, so that they CAN thermoregulate as needed---remember too hot is more dangerous that 60F temps. I would let them room together until the power is back on. They'll pile together naturally, and that will help them hold their heat.
If you can keep it in the upper 60s, they'll be fine. Keep an eye on them for upper respiratory infections afterwards, especially if the temps drops lower than that, and be ready to quarantine them if they shows signs of sickness. But 60s won't kill them outright.
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