Nobody likes allergies. Even more so, the word “moist” is a big no-no. Investing in a good dehumidifier is a great way to reduce excess moisture in your space, especially if you’re prone to allergies. Plus, the small appliance is typically low-maintenance to empty, especially if your dehumidifier has a water basin. But here’s the catch-22: what’s the difference between a dehumidifier and a humidifier? “A dehumidifier removes moisture from the air, as opposed to a humidifier which adds it,” Dr.