Indoor Swimming Pools in Winter

I'm only briefly in here because I'm in the middle of something else but I actually know the answer to this. Swimming pools do work inside in winter. The pool at the Harbor Quarter Gym is actually outside because the roof is open. That's why you can't use it in the winter in its original state. If you were to put a glass roof up, you would be able to use it in the winter. Windenburg is cold and snowy in the winter. I know that it almost looks like it is an indoor pool but it is not. Some of the other worlds have hot days in the winter during which you can swim outdoors such as the desert worlds and Sulani.

I have multiple indoor pools that sims use in winter. Among those that I have added include: an indoor pool in the Fontainebleau Penthouse in the Arts Quarter of San Myshuno that has glass walls to see the city; an indoor pool in a massive gym that I reconstructed in Oasis Springs where I let sims from different worlds visit in winter for swimming; the gym in Del Sol Valley has a pre-made indoor pool. It's not quite the subject but I added an outdoor pool to the gym in Willow Creek and various outdoor pools in some of the worlds.