Water dripping or pooling from your home's residential HVAC ductwork is typically caused by uninsulated or improperly insulated metal ducts passing through unconditioned, hot, and humid spaces like an unconditioned attic or crawlspace. When warm, humid summer air contacts the cold exterior surface of metal ducts carrying chilled air from your air conditioner, moisture in the air condenses rapidly into water droplets, exactly like condensation forming on a cold glass of iced tea on a hot day. Another common culprit is a blocked or cracked condensate drain line overflowing onto the duct insulation. You can troubleshoot by inspecting duct insulation integrity and checking drain lines. You can verify that the problem is resolved when wrapping ducts in thick vapor-barrier insulation or clearing clogs stops condensation and keeps duct surfaces completely dry.
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