Lennox Poor Dehumidification Performance

Lennox air conditioner cycles normally but humidity in the home remains high and feels clammy.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Oversized AC system, High blower speed reducing latent removal, Leaky return ducts pulling humid air, Thermostat not set for dehumidification mode

How to Fix / Troubleshooting

Safety: Turn off power before adjusting blower speed taps or control wiring.

  • 1. Verify thermostat settings: On Lennox iComfort or similar, enable dehumidification features and set a humidity setpoint.
  • 2. Reduce blower speed (technician preferred): Lowering airflow can improve moisture removal. Adjust PSC speed taps or ECM settings per Lennox guidelines.
  • 3. Seal return ducts: Seal leaks in return ducts located in attics or crawlspaces to prevent drawing in humid air.
  • 4. Consider dedicated dehumidifier: In very humid climates, adding a Lennox whole-home dehumidifier may be necessary.

Note: Do not reduce airflow below manufacturer recommendations; this can cause coil freeze-up.

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Repair Difficulty

Medium 3/5

Required Part

Lennox ECM Blower Motor
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