Hot tub use creates significant steam and moisture buildup, which can damage the interior of your garage and create potential health risks for bathers. Your garage should have a ventilation system that allows steam to escape, but won't let in cold air.
Learn about why putting a hot tub in your garage is not a bad idea.. DANA: Now
I have to ask… why would you want to put your hot tub inside of your house in. insist on installing your hot tub indoors (including in the basement or garage).