I just use blue masking tape to keep it in place. I'm sure packaging tape would also be fine, but just difficult to remove if you ever want to. People who think some tape on a UTH will melt or start a fire are forgetting that this is why they use thermostats... to keep the temps low LOL. Our own hands when warm are almost 100 degrees, so if our hands can't melt tape, the UTH won't melt it.![]()
The ultratherms on reptilebasics list their dimensions, so you can just measure whatever size you need that fits about 1/3~1/2 of the tub.
You can definitely poke a ton more holes in your tub, like 10 on each side and see how it goes. But if your house/room is higher humidity to begin with, that may also be why, and it's fine as long as there is good ventilation in the tub.
What is the cool side temp?
You can use another UTH and thermostat set for the cool side. Or you can just heat your whole room to an adequate temp.









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