The answer to 'maintenance blowing cold air' is that the most common causes are a refrigerant leak, a malfunctioning thermostat, or a problem with the blower fan. Symptoms may include the system blowing cold air even when the thermostat is set to heat, or the air not getting as warm as it should. Solutions can include repairing a refrigerant leak, replacing a faulty thermostat, or troubleshooting the blower fan.
For minor issues, you may be able to troubleshoot and fix the problem yourself. However, for more complex problems or if you're not comfortable working on the HVAC system, it's best to call a professional HVAC technician to diagnose and repair the issue. They have the proper training, tools, and expertise to safely and effectively resolve the problem.