Troubleshooting HVAC problems can be difficult, and it's always best to consult a professional technician. However, there are some basic steps that a homeowner can take to troubleshoot HVAC problems: Check the thermostat settings Check the air filters Check the airflow Check the refrigerant levels Check the drainage Check the electrical connections Check the unit's operation Check the compressor If you cannot troubleshoot the problem yourself or if it persists, it's best to contact one of our professional HVAC technicians to diagnose and repair the problem.