The answer to 'why is my air conditioner blowing cold air' is that the air conditioner is functioning properly and cooling the air as it should. This is a common occurrence when the air conditioner is running and working correctly to lower the temperature in your home.
Some common causes for an air conditioner blowing cold air include a properly set thermostat, the compressor and refrigerant levels working as intended, and the air handler and ductwork delivering the cooled air throughout your home. As long as the system is maintaining the desired temperature, this cold air is a sign that your air conditioner is operating as it should.