AprilAire 500 Whole-House Humidifier - Automatic - Large Capacity Water Saver Furnace Humidifier for Homes up to 3,000 Sq. Ft. - Walmart.com
Amazon.com: AprilAire 4655 Manual Whole Home Duct or Wall Mounted Humidifier Control Humidistat for AprilAire Whole House Humidifiers, Low Voltage 24VAC : Home & Kitchen