A dehumidifier can easily put those temps in the 90s If your exchanging enough air, and if you exchanging a ton of air, the dehumidifier won't help much. If your saying your not venting at all your going to have smell issues from not filtering that are more noticeable than fan noise. If you run a decent (80-120 dollar) 200cfm in line fan at 30 to 50 percent it won't be that loud. If that's more than you want to deal with, how about running the dehumidifier outside of the closet to keep temps down, and get a fan going in there