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Why does my furnace cycle on and off frequently?

By Bob Millaway, South Jersey Community Expert & REALTOR®

Short cycling happens when the furnace turns on and off too often. Common causes include a dirty air filter, a clogged flame sensor, an oversized furnace, or a faulty thermostat. A dirty filter restricts airflow, causing the system to overheat and shut down. Start by replacing the filter and checking the thermostat. If the problem persists, call an HVAC technician to diagnose the issue.

Why It Matters

Short cycling wastes energy, increases wear on your furnace, and leads to uneven temperatures and higher utility bills.

Related Questions

How old should my HVAC system be before replacing? What size HVAC system do I need for my home? Why is my AC not blowing cold air? Why is my furnace not turning on? How can I improve my indoor air quality?

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