I use a 3.5 cubic foot for mine. I vacuum freeze my mice and I (so far) can fit 70 in the mini freezer, which is enough for a year's worth of food for my ball. Then again, I only have one python at the moment. When I upgrade, a 5 cubic foot sounds better to me. Then again, my current 3.5 cubic foot has such a strong coldest setting that if I put any liquid in the regular fridge, it's frozen by the morning. So, small + powerful = ideal. The more room you have, the harder it has to work to cool. If you're stuck between a 1.5 and a 3.2, I'd suggest going for the 1.5. If that's not enough, just look for a size in-between. Craigslist has some nice, cheap fridges.
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