Buy a small heat pad and put it under the enclosure where the water bowl is. All you need is a 4-8 watt.. wont cost anything in electric. Heated water works wonders. My home is 30% and my enclosures 60% once water is heated from my RHP or Heat Mat/Tape etc.
PS: you need to keep the screen covered all the time. You can use Tin Foil or like I did when I used tanks Plexiglass from LOWES or Home Depo cut to the size. I had to use 2 pieces to equal 4’.
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