Ambient temperature tends to be cheaper to maintain than heating for individual cages or tubs. But it depends.

How are you heating the room? If a space heater, what kind? And describe the construction of the room. Size, number of exterior/interior walls, etc.

My snake room is 17' x 9' and is in the back of my third garage stall. When it is below freezing outside I can heat the room to over 90* with less power than it takes to run seven 100 watt light bulbs. But I designed it from scratch for this, including 220 volt heaters and radiant blocking insulation.

Still, there may be some things you can do.
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Currently keeping:

6.10 Gonyosoma oxycephalum (Javan, mixed colors)

1.1 Philodryas baroni

1.1 Lampropeltis triangulum multistriata

1.0 Rhodesian Ridgeback

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