AprilAire Humidistats are a line of whole-home humidifiers that work with a home's HVAC system to add moisture to dry indoor air. AprilAire offers a range of humidifiers to fit different-sized homes and different humidity needs. Its humidifiers work by drawing dry air into the unit, adding moisture, and then distributing the moistened air back into the home through the HVAC system's d... https://www.partshnc.com/m/aprilaire/aprilaire-humidifier-parts