SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/home-a-hvac-drain

What can a plugged condensate drain on your AC or furnace cause?

Water damage in the house, and humidity problems.

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  1. Water damage in the house ✔
  2. A natural gas leak
  3. A drop in the water bill

Why: The condensate drain carries away water the system makes. ENERGY STAR says a plugged drain can cause water damage in the house and affect indoor humidity levels.

Huh, didn't know that: A pre-season HVAC tune-up includes checking and inspecting this drain.

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What happens when you throw a blue hat into the ocean? It gets wet.
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References

Answer: Water damage in the house. The condensate drain carries away water the system makes. ENERGY STAR says a plugged drain can cause water damage in the house and affect indoor humidity levels.

  1. ENERGY STAR: Maintenance Checklist www.energystar.gov/saveathome/heating-cooling/maintenance-checklist
    A plugged drain can cause water damage in the house and affect indoor humidity levels.
    Checked 2026-10-10.

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