I built a fully enlosed (except for the front) rack out of pvc. Ambient room temperatures are around 67 degrees in the area of my house where the rack is. my rack is for 15qt tubs, and I was heating with 4" heat tape under the back of the tub. I ended up putting another strip of heat tape under the front end of the tub and setting that to 80 degrees, My ambient temps were still in the mid 70's, which is okay, but I added an oil radiant heater near my rack and now have ambients around 80-81.
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