The answer to 'air filter short cycling' is that the air filter is likely clogged or dirty, causing the HVAC system to short cycle (turn on and off rapidly). This can lead to increased energy usage, reduced comfort, and potential damage to the system.
Common causes of air filter short cycling include a dirty or clogged filter, a filter that is the wrong size for the system, or a filter that has been installed incorrectly. Symptoms may include frequent cycling, uneven temperatures, and higher energy bills. To solve the issue, you should first try replacing the air filter with a clean, properly sized one. If the problem persists, it's best to call a professional HVAC technician to diagnose and address the underlying issue.