The answer to 'my emergency HVAC service keeps shutting off' is that there are several common causes, including a tripped circuit breaker, a clogged air filter, or a problem with the thermostat or compressor. The symptoms may include the system turning on and off repeatedly, poor airflow, or the unit not providing any cooling or heating.
To troubleshoot this issue, you can start by checking the circuit breaker and resetting it if it has tripped. You should also check the air filter and replace it if it's dirty. If those simple fixes don't work, it's best to call a professional HVAC technician to diagnose and repair the problem, as it could be a more complex issue with the system's components or wiring.