AC Short Cycling: Cooling Starts Then Stops
If you smell gas or a CO alarm sounds, leave the home and call the gas utility or 911 from outside.
AC short cycling is repeated starting and stopping without a normal sustained cooling run. Thermostat, airflow, sizing, and equipment faults can produce similar behavior. Record the run pattern and room temperature, check an accessible filter, and arrange diagnosis if the cycling continues rather than trying repeated manual restarts at the thermostat.
Talk to a contractor about your AC short cycling
Call (877) 565-3062One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
HVAC Responder Editorial Team · Reviewed 2026-11-01 · Facts quoted from manufacturer documentation
What the source supports
According to AC Short Cycling? Learn Why and What to Do - Trane:
If you’re wondering “Why is my AC short cycling?” there are two main causes: thermostat issues or an improperly sized system.
Discuss your AC short cycling with a contractor
Call (877) 565-3062One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
Safe observations before the service call
Keep supply and return grilles unobstructed and note whether the thermostat sits near a heat source. Do not change installer settings to lengthen cycles.
Details to give the contractor
Say whether the cycling has always happened or appeared suddenly. Include recent filter or thermostat changes and whether the home ever reaches the selected temperature.
What happens when you call about your AC short cycling
- Your call routes to an independent local contractor registered for your ZIP code.
- Ask the fee and the arrival window.
- The decision to hire stays with you.
One call reaches a contractor registered for your ZIP; ask the fee and the arrival window.
Sources and review date
- AC Short Cycling? Learn Why and What to Do - Trane · Read 2026-11-01