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Old 11-06-2012, 02:11 PM   #1
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Verify Humidifier is Working

I have a whole house humidifier on my heat pump. It goes to a bypass on the return vent.

How do I verify it works? When I turn the valve (one of those tiny ones attached to plastic tube), I see water coming down and going out to the floor drain. But how do I verify that it is going to the pad in the humidifier? I just don't feel any difference in house humidity levels.


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Old 11-06-2012, 02:38 PM   #2
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Post a pic of it. You should open it and look at the pad to see if it is scaled up or needs replacing anyway.


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Old 11-06-2012, 04:50 PM   #3
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You can often remove the cover and watch it go down the panel. On some systems with poor air flow it may blow the water out at you though. may need to connect to the hot water line instead of the cold water line. heat pumps often don't have a high enough air temp for water humidifiers to work right.
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Old 11-06-2012, 06:25 PM   #4
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You can also get a hygrometer (reads out humidity level) and see if it increases as your heating system runs. Even if the humidity number stays constant as temp in the house increases that is an indication that you are adding moisture to the air.

With the humidifier on my gas furnace I usually see a couple % increase in humidity along with a 1 or 2 degree temp rise for a typical heating cycle. But with the cooler supply temps of your heat pump I wouldn't expect that much. As BT mentioned connecting your humidifier to the hot water will help.
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