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We just bought a house with a large, unfinished utility room in the basement, about 15 ft x 20 ft. The previous owner just used it for storage. It has washer/dryer hookups and contains the furnace and water heater; otherwise, it's mostly empty, with concrete floors.

We were thinking about finishing it with moisture-resistant drywall and using the extra space to install a small indoor hot tub.

Would this be possible to do? Or is it a bad idea, because the humidity in the room could rust, damage, or short out the appliances like the washer, dryer, furnace, and water heater?

The room does have a window, so we could open that whenever the hot tub cover is off in order to vent the steamy air; however, I'm still worried if this would be sufficient.

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    You really need a exhaust that is controlled by a humidistat. It is code in some locations now even for a bathtub with jets. – Ed Beal Jan 7 '18 at 12:02
  • Sounds like an answer @EdBeal – mmathis Jan 8 '18 at 15:27
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Expensive homes have indoor pools all the time, however they also have rather sophisticated air ventilation systems. Without it you would have uncontrolled mold accumulation. No matter how tight the lid is on the hot tub you are still going to introduce a lot of moisture into the house that other wise would not be there. I would recommend full exterior grade paint on in this newly and entirely finished utility room. Weatherproof exterior grade doors should be included in the room with no open air space shared by the main part of the house and this utility room. All adjoining spaces will need to be weatherproofed and caulked. No shared HVAC system components or duct work. And last but not least you will want a fully controllable and robust air ventilation system that is sensitive to temperature and humidity levels.

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