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We keep the house at 68 degrees during the winter, and sometimes at night it drops to 65. Outdoors it can be as low as -7 degrees. My walls are not well insulated so it is always a bit chilly. I often crack my window, even in winter, even when it's below freezing, because I love the fresh snowy air. Which small pets can thrive in a cold house like this? I want something that can live in a 10 gallon aquarium. I'm open to reptiles, gerbils, fish or anything else that might fit in there. I just don't want it to get pneumonia. Please let me know which animals can live comfortably in my house, and if there are any special things I would need to do to make sure they're healthy and happy. Thank you!