10'C = 50'F, 15'C = 59'F, 20'C = 68"F, 25'C = 77'F.
Of all the prey species that we raise, the rats are the least able to withstand the cold. I'd be very cautious about keeping them in a room that may get much cooler than 10'C. If you look at a map of the natural range of the rat, you'll see that there aren't any living wild in the Northwest Territories, or in the northern parts of the provinces.
Rats aren't very good at nest-building. When it gets cold, they just stay exposed and shiver like crazy, and they very quickly develop pneumonia. Baby rats born in a room that is too cool, won't stand a chance of surviving. They can't hibernate. They'll breed, but it will really drain the mama's strength.
The hamsters are the hardiest, they can survive quite well down to below freezing 0'C (32'F). They build very good nests, and then they curl themselves up into tight balls that conserve their body-heat really well. They can and will hibernate below 5'C, and will survive even if it is several degrees below freezing, provided they have good nesting material. Baby hamsters can be born and survive quite well even when their room is in the 5'C-to-10'C range.
Mice are intermediate. They build good nests, like hamsters, and they have some hibernating capability. They'll breed successfully even at temps below 5'C (41'F). Mice are much better at all bunking down together and keeping each other warm than rats are.
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Tricia
"Nothing is so firmly believed as that which we do not know."
<i>H. L. Mencken</i>
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