I never had a basement, and I was ignorant of the benefits of a portable dehumidifier. But last spring I found myself on dehumidifier TikTok and decided to take my indoor air quality up a notch. This past summer I lived in a damp cabin in Maine where the humidity level was often at 80 percent, according to my air quality monitors. And so these are the best models out of the many we tested, from our best for basements pick, the Honeywell Smart Portable Dehumidifier ($260), to our best portable version for travel or small spaces, the Eva-Dry Renewable Mini Dehumidifier E-333 ($25). For more ways to improve your indoor quality, check out our guides to Best Air Purifiers, Best Air Quality Monitors, Best Window Air Conditioners, Best Space Heaters, and Best Fans.