Never had one in Wisconsin. Moved to Florida and our then 25 year old house came with one in the pool bath (outside shower head and sauna where a shower would be indoors)- outside entrance. Advantage to never having to clean another shower stall.The inspector said it worked. We use it to store stuff- such as leftover tile and pavers. Here we can get hot and sweaty sitting outdoors in the summer then jump in the pool.