What is short cycling in a gas furnace?

Short cycling in a gas furnace refers to the situation where the furnace frequently turns on and off in a short period of time, rather than maintaining a continuous operation to reach the set temperature. This can occur due to a variety of issues, including improper thermostat placement, an oversized furnace, or problems with the ignition system.

When a furnace begins to short cycle, it can lead to various operational inefficiencies and increased wear and tear on the components. Not only does this diminish the system's efficiency in heating the space, but it can also result in discomfort for the occupants as temperatures fluctuate drastically.

Understanding the concept of short cycling is fundamental in diagnosing and troubleshooting furnace issues, as well as in performing preventive maintenance to ensure the system operates smoothly and effectively. It’s important for HVAC professionals to recognize this symptom so they can implement the appropriate solutions to maintain optimal functionality and efficiency.