The answer to 'air handler short cycling' is that the air handler in your HVAC system is turning on and off rapidly, often within short intervals. This can be caused by a variety of issues, including a problem with the thermostat, a clogged air filter, or issues with the compressor or refrigerant levels. Short cycling can lead to increased wear and tear on the system, higher energy bills, and uneven heating/cooling throughout your home.
Some common solutions include replacing the air filter, checking the thermostat settings, and having a professional HVAC technician inspect the system for any refrigerant leaks or other mechanical issues. It's generally best to have a professional diagnose and repair the problem, as improper DIY repairs can potentially make the issue worse or even damage the system.