The answer to 'why is my ductless system blowing hot air' is that there could be several common causes, such as a refrigerant leak, a problem with the reversing valve, or a malfunctioning thermostat. These issues can prevent the system from properly cooling your home and cause it to blow hot air instead.
Some key symptoms to look for include the system running constantly, the air coming out of the vents feeling warm, and your energy bills increasing. If you notice these issues, it's best to call a professional HVAC technician to diagnose and repair the problem, as ductless systems require specialized knowledge and equipment to service properly.