My sewing space is totally underground. No windows at all. When the house was being built, I had extra lights put in. Do not really have a problem with humidity, guess because it is finished. This is the price I paid to get about 1800 square feet all my own. I only HAVE to clean it once or twice when the kids come home. Their bedroom is also down there. It does get cleaned at the end of each project. Try my best to stay organized.