Check the ventilation of the room in which you plan to install the hot tub. Steam should be able to escape freely into the outside air through ducts or windows. The room should also be well insulated for year-round use.
Install an exhaust fan if necessary. You may need one if you plan to install the hot tub in a room already prone to moisture buildup, such as the garage or a basement. Having an exhaust fan will help prevent harmful mold and bacteria buildup.
Install a water-resistant floor if the room does not have one. Recommended materials include ceramic tile, concrete, stone or vinyl. Don’t use carpet or soft woods that tend to absorb water and can get damaged easily.
Paint the walls with moisture-resistant paint. This will prevent cracking and peeling, which occur in rooms with high moisture content. Moisture-resistant wallpaper, tile and concrete are other viable options for the walls.
Hire a professional to check the floor structure in the room where you plan to place the hot tub. Water weighs about 8 lbs. per gallon and the tub alone can weigh several hundred pounds. Consider the weight of the bathers as well. An average hot tub holds five or six people.
Buy a hot tub specifically designed for indoor use. Consult with a hot tub dealer about the different options. Provide the dealer with useful information such as the size of the room and the frequency with which you plan to use the hot tub.
Hire a professional to install the hot tub and install any additional plumbing or electrical wiring that may be necessary.