The answer to 'my HVAC system keeps shutting off' is that there are several common causes, including a dirty air filter, a malfunctioning thermostat, a refrigerant leak, or an issue with the compressor or blower motor. Symptoms may include the system cycling on and off frequently, poor airflow, or uneven temperatures throughout your home.
In many cases, you may be able to troubleshoot and resolve the issue yourself, such as replacing a dirty air filter or checking the thermostat settings. However, for more complex problems like refrigerant leaks or compressor failures, it's best to call in a professional HVAC technician to diagnose and repair the issue properly.