We built our indoor to start with but the room isn't connected HVAC wise to the rest of the house. We added an exhaust that goes directly outside keeping the room at a negative pressure from the rest of the house and then take fresh air in the house, which in turns either leaks back in to the pool room or though and equalization duct. This last winter we added a heat recovery ventilator to the mix, basically it passes exhaust pool air through a membrane and then the fresh incoming air passes through that same membrane. It moves about 50CFM in low and 100 CFM in high. In low I can see air leaving the pool room at 82F and leaving the house at 50F, incoming air can be 10F and entering the house at 65F, amazing little box.
The inside of our poolroom is durarock covered with dryvet, everything in the room is exterior grade. Dryvet is the modern version of stucco and looks as good as the day it was put in. We have never had any humidity problems with the house as a matter of fact we had to add a whole house humidifier the winter after we built.
I have a little more info on it in my link below.
Oh a pool cover is a must!
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