Racks have the same issues typically they are used in rooms at or near the correct cool side temps they too are not efficient heaters. Especially given uth do not heat air well there is really only one way to hold correct ambient temps room temp control.
No enclosure is better than an other each has it's own issues the thin walls of tubs have very poor insulation value systems using them have heat issues open top tanks have humidity issues and turned tanks and plastic have cost space issues. I live in a cold area and an old house so heating a room for me is crazy expensive and not practical.
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