Use two strips of heat tape under the tub(s):
Set hot side thermostat to 91-92*F.
Set cool side thermostat to 82-83*F.
Put a hide over each strip. If you use aspen bedding you can also pile it around/over each hide to further insulate the space underneath the hide.
You can also warm just the room with your snake enclosures. I've also seen where people turn a very small space, such as a walk-in closet, into a "snake room" and they heat that separately.
I have a few racks in a cooler part of the house. I put a blanket over them in the winter and it bumps up the ambient temp in the tubs by a few degrees.
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