The answer to 'why is my ductwork blowing hot air' is that there are a few common causes, including a malfunctioning thermostat, a problem with the air conditioning unit, or leaks in the ductwork. If the ductwork is blowing hot air, it usually indicates an issue with the cooling system rather than the heating system.
Some common symptoms include the home feeling warmer than the thermostat setting, the air conditioning unit running constantly, and high energy bills. Solutions may involve adjusting the thermostat, cleaning or repairing the AC unit, or sealing any leaks in the ductwork. While some minor ductwork issues can be DIY-fixed, it's generally best to call a professional HVAC technician to diagnose and repair more complex problems to ensure the system is working safely and efficiently.