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Leaking central A/C unit (Lennox G40uh)

The unit works fine (4 year old). When I lower the thermostat to around 72 degress F, I have massive condensation on the blower systems on the vents. Today I remove the filter on the return side to see if that will help. Any suggestions?

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Make sure your condensate drain is clear of algae and other things that can clog the drain line plumbing. This can also lead to hard to control mold and mildew problems inside. Take a "wet or dry" shop vac to the end of the condensate drain line and vacuum out whatever is in the line until it is clear. The drain should flow well and not a occasional drip.

To control the build up of this gunk, about once a month, pour a cup of white vinegar into the drain line near the beginning of the line and the acidity of the vinegar will kill and prevent the regrowth of the drain clogging gunk without harming the environment outside.

If you still have problems, find and reduce sources of humidity inside the building. If the AC is too large for the building, it can fail to run long enough to extract moisture. If the blowers are partly in a hot space and partly in the cool room, the colder setting can cause the humidity to condensate on it as it does naturally in the AC unit and in our weather.

Hope this helps you get started. If not, consult your local HVAC company. See if you have an ARS service near you.

Posted on Jul 28, 2009

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