Thermostat frequently cycles the system on and off (short cycling)

Note: Short cycling can reduce efficiency and wear out equipment.

• Step 1 – Check cycle settings: In the thermostat installer or advanced settings, adjust the cycle rate or temperature differential to allow longer run times (e.g., 0.5–1.0°F differential).
• Step 2 – Verify thermostat location: Ensure the thermostat is not in a draft, near exterior doors, or directly in the airflow of a supply vent.
• Step 3 – Check for oversizing: If the system reaches setpoint very quickly and shuts off, the equipment may be oversized. Consult an HVAC professional for load analysis.
• Step 4 – Observe operation: After adjustments, monitor system operation over several hours to confirm longer, more stable cycles.