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All brands · Refrigeration troubleshooting

Attic very hot / mildew / ice dams

What is going on

Possible causes and checks for: attic very hot / mildew / ice dams.

Likely causes

  • Inadequate attic venting

Check in this order

  1. Soffit + ridge/gable/roof vents
  2. Gable fan
  3. Whole-house fan sized for change every 8–10 min

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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.