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How to Turn Off Your Humidifier for the Summer

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Humidifiers are great for relieving dry air symptoms that come with winter. But winter is finally out the door – you won’t be needing that humidifier for a while! Many people forget to turn off their humidifiers in the spring, which can prevent your central air conditioner or dehumidifier from working properly. Fortunately, shutting down your humidifier is fairly easy and should be done as part of any spring cleaning project you take on.

How to Prepare Your Humidifier for Shutdown

First, turn the humidistat on your whole house humidifier to the OFF position. If this isn’t possible, set it to the lowest possible setting (the humidistat is usually installed on the return air plenum, right above the humidifier. If not, it might be installed on the wall near the thermostat.).

Next, turn off the water supply to the humidifier. To do this, find the quarter inch water line (usually a copper or plastic pipe) and follow it out of the humidifier until you reach the water supply valve. Turn the valve  clockwise until it stops. If the valve on your whole house humidifier system is a saddle valve (the kind that clamps onto a copper water pipe) it might not allow for 100% shut off – this is okay.

When the water has been shut off, open the cover on the humidifier, remove the water filter and clean it out with soap and water. Store it in a dry place and wait for it to be reinstalled in the fall.

Once you’ve done this, close the duct damper on your whole house humidifier system, or turn it to the summer position. This will block the flow of cold air from the air conditioning system so it doesn’t go into the humidifier. If your system does not have a duct damper, you can disregard this step.

After you’ve finished turning off the humidifier and cleaning it all up, replace the cover. That’s it, you’re done!

If you want a licensed residential HVAC contractor to inspect or help you shut down your whole house humidifier system in MD or DC, call Michael Bonsby Heating & Air Conditioning today!

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