The furnace frequently turns on and off in short bursts, and the house temperature fluctuates.

Safety: Repeated short cycling can stress components and reduce efficiency.

Steps:

• Thermostat location: Ensure the thermostat is not near heat sources, drafts, or direct sunlight.
• Adjust settings: On programmable thermostats, increase the temperature swing or cycle length if available.
• Airflow checks: Confirm filter and vents are clear to avoid overheating and rapid limit cycling.
• Professional assessment: If cycling persists, a technician should evaluate furnace sizing and control strategy.