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How to Install a Whole-House Humidifier | Ask This Old House

Ask This Old House plumbing and heating expert Richard Trethewey shows an efficient, low-maintenance way to humidify the air. (See steps below.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Richard visits Charlotte, NC to install a whole-house humidifier. A whole-house humidifier should be installed by a professional HVAC contractor. Steps for How to Install a Whole-House Humidifier: 1. Disconnect the flexible supply ducts from the sides of the heat pump. 2. Remove the existing main trunk from the top of the heat pump. 3. Build a new sheet metal trunk. 4. Cut three 4-inch-diameter holes into the top of the new main trunk. 5. Over each hole fasten a take-off fitting with balancing damper. 6. Mount a louvered sheet metal elbow to the top of the heat pump, then attach the new main trunk to the elbow. 7. Attach one 12-inch-diameter take-off fitting onto the side of the main trunk. Fasten a second fitting to the bottom of the trunk. 8. Cut a 2 1/2-inch hole in the back of the trunk, then insert the humidifier wand. Secure the wand to the trunk with sheet metal screws. 9. Run a new copper cold-water supply line from the water heater to the humidifier. 10. Connect a drain line from the humidifier to the existing drainpipe on the heat pump. 11. Have a licensed electrician run a new 220-volt circuit to the humidifier. 12. Control the humidifier with a humidistat set to approximately 35 or 40 percent. Richard installed a Nortec Humidifer [https://www.condair.com/], model number RH2. Expert assistance with this project was provided by AirTight Mechanical [https://www.atftservices.com/]. About Ask This Old House TV: Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook. Looking for more step by step guidance on how to complete projects around the house? Join This Old House Insider to stream over 1,000 episodes commercial-free: https://bit.ly/2GPiYbH Plus, download our FREE app for full-episode streaming to your connected TV, phone or tablet: https://www.thisoldhouse.com/pages/st... Follow This Old House and Ask This Old House: Facebook: http://bit.ly/ThisOldHouseFB Twitter: http://bit.ly/ThisOldHouseTwitter http://bit.ly/AskTOHTwitter Pinterest: http://bit.ly/ThisOldHousePinterest Instagram: http://bit.ly/ThisOldHouseIG http://bit.ly/AskTOHIG For more on This Old House and Ask This Old House, visit us at: http://bit.ly/ThisOldHouseWebsite How to Install a Whole-House Humidifier | Ask This Old House    / thisoldhouse