Gibson Condensation / Humidity Issue

Furnace cabinet sweats or shows condensation on the outside

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Possible Causes

High indoor humidity, Cold air leaks around Gibson furnace cabinet, Poor duct insulation near unconditioned spaces, Condensate drain splashing or leaking onto cabinet

How to Fix / Troubleshooting

Safety first: Turn off power before sealing any openings around the furnace.

Steps to check:

  • Air leaks: Inspect around the furnace for gaps where cold air may be entering and seal with appropriate materials (mastic, foil tape).
  • Condensate leaks: Ensure condensate hoses are not dripping onto the cabinet and are properly routed to a drain.
  • Humidity control: Use a dehumidifier if indoor humidity is excessively high.
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Repair Difficulty

Easy 2/5
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