![Amazon.com: AprilAire 400 Whole-House Humidifier, Automatic Water Saver Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 5,000 Sq. Ft., White : Home & Kitchen Amazon.com: AprilAire 400 Whole-House Humidifier, Automatic Water Saver Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 5,000 Sq. Ft., White : Home & Kitchen](https://m.media-amazon.com/images/I/713QElbV4GL.jpg)
Amazon.com: AprilAire 400 Whole-House Humidifier, Automatic Water Saver Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 5,000 Sq. Ft., White : Home & Kitchen
![The house I bought has an old furnace with this Aprilaire unit attached. I see it's a humidifier, but as far as I can tell its main purpose is to let AC The house I bought has an old furnace with this Aprilaire unit attached. I see it's a humidifier, but as far as I can tell its main purpose is to let AC](https://preview.redd.it/c6254pc7mpq71.jpg?width=640&crop=smart&auto=webp&s=befff76a2e7e7420e0260bfdf4fd2b195ec8502f)
The house I bought has an old furnace with this Aprilaire unit attached. I see it's a humidifier, but as far as I can tell its main purpose is to let AC
![AprilAire 700M Whole-House Humidifier, Manual Fan Powered Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 5,300 Sq. Ft., White: Faucet Aerators And Adapters: Amazon.com: Industrial & Scientific AprilAire 700M Whole-House Humidifier, Manual Fan Powered Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 5,300 Sq. Ft., White: Faucet Aerators And Adapters: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/71VpLvUWr7L._AC_UF894,1000_QL80_.jpg)
AprilAire 700M Whole-House Humidifier, Manual Fan Powered Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 5,300 Sq. Ft., White: Faucet Aerators And Adapters: Amazon.com: Industrial & Scientific
![AprilAire 400M Whole-House Humidifier - Manual - Large Capacity Water Saver Furnace Humidifier for Homes up to 4,000 Sq. Ft. - Walmart.com AprilAire 400M Whole-House Humidifier - Manual - Large Capacity Water Saver Furnace Humidifier for Homes up to 4,000 Sq. Ft. - Walmart.com](https://i5.walmartimages.com/asr/8bf73083-c80f-4531-81cb-9db57cc1f595.0a4a6a69ee99f429c6d8144b53821b32.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
AprilAire 400M Whole-House Humidifier - Manual - Large Capacity Water Saver Furnace Humidifier for Homes up to 4,000 Sq. Ft. - Walmart.com
![AprilAire 700 Whole-House Humidifier - Automatic - Large Capacity Fan-Powered Furnace Humidifier for Homes up to 4,200 Sq. Ft. - Walmart.com AprilAire 700 Whole-House Humidifier - Automatic - Large Capacity Fan-Powered Furnace Humidifier for Homes up to 4,200 Sq. Ft. - Walmart.com](https://i5.walmartimages.com/asr/d3b0953e-4a98-4c52-8edc-084322f48d9a.02d97e438080f5bd378cf698a8b3d5d0.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
AprilAire 700 Whole-House Humidifier - Automatic - Large Capacity Fan-Powered Furnace Humidifier for Homes up to 4,200 Sq. Ft. - Walmart.com
![Amazon.com: AprilAire 500 Whole-House Humidifier, Automatic Compact Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 3,600 Sq. Ft., White : Home & Kitchen Amazon.com: AprilAire 500 Whole-House Humidifier, Automatic Compact Furnace Humidifier, Large Capacity Whole-House Humidifier for Homes up to 3,600 Sq. Ft., White : Home & Kitchen](https://m.media-amazon.com/images/I/71f8hSLs-kL._AC_UF894,1000_QL80_.jpg)