I have a screened in Lanai with a full roof over it. I have a 220volt newer hot tub in it. I have never had any mold issues in the Lanai. When the hot tub is not in use there is a tight, insulated cover on it. The inside of the cover needs a cleaning a couple of times a year, and I do maintain the chemical balance in the tub according to the manufacturer's recommendations...it is no problem.
I would not be concerned or have buyers remorse. Enjoy your hot tub. It's great to sit in it and relax at night before going to bed.
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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