What can lead to short cycling in an HVAC system?

Short cycling in an HVAC system occurs when the unit turns on and then quickly turns off before completing a full cycle. This can lead to inefficient operation, increased energy costs, and reduced comfort. Low refrigerant levels can directly contribute to this issue by causing the system to fail to cool or heat effectively. When the refrigerant is low, the pressure drops, which can trigger the system's safety mechanisms. These protections kick in to prevent the compressor from running under unsafe conditions, leading to frequent on-off cycling.

While undersized ductwork can create airflow restrictions that may cause the system to struggle, overheating components usually lead to shutdowns rather than short cycling. Incorrect thermostat settings might also cause improper cycling, but typically, it's the direct impact of low refrigerant levels that is a principal cause of short cycling, as it affects the overall operation of the system significantly.