The air conditioning unit is not blowing cool air. What should I do?

Probably the temperature set that you have chosen is higher than the temperature of the room. In order your unit to operate in cooling mode you reset the desired temperature lower than the room’s temperature. Maybe on the other hand, you have forgotten to change the operating mode from fan or heating to cooling mode. Check on your remote control that it shows cooling mode. The condenser may be dirty, so it should be cleaned, or there is inadequate air flow around it. The evaporator or the filters might be dirty and they should be cleaned. Also, there might be a lack of refrigerant maybe due to leakage. A certified technician should at first check for possible leaks and add refrigerant if it is needed.