That's completely up to you. I don't use tubs, so can't comment on whether they'd work or not in your situation.
I use 1/2" foam board insulation on all my glass enclosures. I wrap the back and sides, then lay a piece on top with a hole cut out for heat lamp.
It helps immensely with heat and humidity control. It gets cold and dry in MA and I have zero problem maintaining proper humidity.
You may also want to increase the size of you water dish or add another. Placement of the water bowl makes a difference as well.
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