The answer to 'HVAC system blowing hot air' is that there are several common causes, including a refrigerant leak, a malfunctioning compressor, or a problem with the thermostat. Symptoms can include the air from the vents feeling warm or hot, the system running constantly, and higher energy bills. Some solutions may include repairing a refrigerant leak, replacing a faulty compressor, or adjusting the thermostat settings.
In many cases, diagnosing and repairing an HVAC system blowing hot air requires the expertise of a professional HVAC technician. While simple thermostat adjustments may be a DIY fix, more complex issues like refrigerant leaks or compressor problems should be handled by a licensed and insured HVAC professional to ensure the work is done safely and properly.