Furnace “Short Cycles”

A short-cycling furnace is one that turns on and off frequently, rather than running in longer, more efficient cycles. This can lead to inefficient heating, higher energy bills, and potential damage to furnace components.

What Causes Short Cycling?
Short cycling can be caused by several factors:
Oversized Furnace:
A furnace that’s too large for your home may turn off before the desired temperature is reached, leading to short cycles.
Thermostat Issues:
Faulty thermostat wiring, improper thermostat settings, or a malfunctioning thermostat can cause short cycling.
Airflow Problems:
Clogged air filters, restricted registers, or ductwork issues can prevent the furnace from operating efficiently, leading to short cycling.
Other Factors:
Dirty heat exchanger, low refrigerant levels (in air conditioners), or a faulty flame sensor can also contribute to short cycling.

How to Address Short Cycling:
1. Check Air Filters: Replace or clean your air filters regularly.
Inspect Thermostat: Ensure the thermostat is functioning properly and set correctly.
2. Address Airflow: Make sure registers are open and not blocked, and check for ductwork leaks.
3. Professional Inspection: If you suspect a more serious problem, consult a qualified HVAC technician.
4. Proper Furnace Sizing: If you suspect an oversized furnace, have your HVAC professional assess your home’s heating needs and recommend an appropriately sized furnace.

In summary, short cycling is a common problem that can significantly impact your home’s comfort and energy consumption. By understanding the potential causes and taking appropriate steps, you can help prevent or address this issue.