Excessive condensation on copper pipes occurs due to high relative humidity and large temperature differentials. Copper is an exceptional thermal conductor, meaning cold groundwater traveling through the pipe quickly chills the exterior metal surface. When warm, humid indoor air touches this chilled surface, moisture in the air cools past its dew point and condenses into heavy liquid droplets. This thermodynamic process is especially prevalent during humid summer months in uninsulated basements, crawlspaces, and utility rooms. Verification: Wrap copper pipes in thick closed-cell foam insulation sleeves to stop warm air contact.
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