The answer to 'why is my air conditioner blowing cold air' is that there are several common causes, including a refrigerant leak, issues with the compressor, or problems with the thermostat or control board. Symptoms may include the air conditioner running constantly, the air blowing out at a lower temperature than normal, or the system not cooling effectively.
If your air conditioner is blowing cold air, the first step is to check the air filter and clean or replace it if it's dirty. You should also ensure the thermostat is set to 'cool' and the temperature is set lower than the current room temperature. If those simple checks don't resolve the issue, it's best to call a professional HVAC technician to diagnose and repair the problem, as they have the expertise and tools to properly identify and fix the root cause.