As long as it is a brief drop and the animals are all healthy you should be OK, but if there is any minor ailment for animals during the cool down they might have it really take hold and be a problem.

If you are worried a basic oil filled radiating style heater can be set to low to give off some warmth and they are very safe to let run for lengths of time, plus they are not very expensive.
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Herp Conservation Unlimited

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