I used a mini fridge the first year I did it, that was great, stayed at a constant temp. I opened it up every day to check on everyone and in the end when I woke them all up none had lost any weight, in fact, two snakes GAINED weight while in there. So its the way I go!!
-----
FireDrake
1.2 Corn Snake - Basilisk, Belladonna and Kestrel
1.1 Tangerine Honduran - Hellboy and Watchtower
0.1 Western Hognose - Midori
1.0 Ball Python - Mandrake
0.3 California King Snake - Deneb, Code and Phoenix
1.0 Jungle Corn Snake - Uruk-Hai
1.0 Apricot Pueblan Milksnake - Samhain
1.1 Macklots Python (Timor) - Velociraptor and Wraith
1.1 Mali Uromastyx - ET and Aughra
0.2 Bearded Dragon - Chupacabra and FoxGlove
0.1 Rose-hair Tarantula - Shelob
0.1 Cinnamon Pearl Cockatiel - Bubo
2.2 Society Finch - Pesto, Clockwork, Min and Spicy
1.1 Diamond Dove - Jade and Luna
3.0 Bettas - Hydra, Maticore and Kraken
1.0 DSH Cat - Bartelby Firecat