If you're going for a niche in the market, try for an indoor rifle range.
That being said, I believe a range should be well lit, and heated. Most places exchange outside air for the ventilation, and that makes it almost unbearable in the WI winters. Very similar to being on an outdoor range.
I travel about 30 minutes to the indoor range in the winters, and my options are incredibly limited. I live in West Bend, so MW Shooters in Lomira is the closest place for me.
Man, I really miss Jay's in Menomonee Falls..........