Ask This Old House plumbing and heating expert Richard Trethewey shows an efficient, low-maintenance way to humidify the air. (See steps below.)
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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.
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How to Install a Whole-House Humidifier | Ask This Old House
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