Ask Absolute · Cooling

Why does my AC keep turning on and off?

Direct answer

Frequent short cycles may be caused by thermostat issues, restricted airflow, overheating, electrical faults, refrigerant problems or equipment sizing.

What this usually means

Short cycling increases starts and stops, which can reduce comfort and add component wear. A dirty filter is worth checking, but repeated cycling should not be dismissed as normal.

Diagnosis should consider cycle timing, thermostat location, airflow, temperature conditions and component operation.

What you can safely check

  • Replace a visibly dirty filter
  • Confirm thermostat location is not being heated or cooled unusually
  • Notice how long each cycle lasts
  • Record any displayed fault code
When to call a professional

Schedule diagnosis if short cycling continues after a filter and thermostat check, especially when comfort is declining.

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