The answer to 'emergency HVAC service freezing up' is that a frozen HVAC system is a common issue that can be caused by several factors, including low refrigerant levels, airflow blockages, or a malfunctioning component. Symptoms may include ice buildup on the coils, reduced airflow, and the system shutting off intermittently.
If you encounter a frozen HVAC system, the first step is to turn off the unit and allow it to thaw. You can then inspect the air filters and clean or replace them if necessary. If the issue persists, it's best to call a professional HVAC technician, as they can diagnose the underlying problem and provide the necessary repairs.