In Canada this problem is solved with an air to air heat exchanger. For a 2,500 sq ft. private indoor pool cost was about $2,000. Basically incoming air [ minus 50 C ] comes in thru abaffle/tube system that is surrounded in a box of baffled outgoing air allowing the exhaust heat to transfer to incoming air.
Another method for just removing humidity without air exchange a silica jel that is very cheap in 100 pound bags that absorbs water/humidity. [used in small sachets in electronics] The crystals absorb water and it wil in fact drip out of the bottom of the sack to be disposed of [donot use for anything]
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