The answer to 'ductless system blowing cold air' is that there are several common causes, including a refrigerant leak, a faulty compressor, or a problem with the thermostat or control system. Symptoms may include the system blowing cold air even when set to warm, or the air not getting as warm as it should.
In some cases, the issue can be a simple fix like adjusting the thermostat settings or cleaning the air filters. However, more complex problems like a refrigerant leak or compressor failure will likely require professional HVAC service. It's generally best to call a licensed HVAC technician to diagnose and repair ductless system issues, as they have the specialized tools and expertise to properly identify and fix the problem.