Tolerating the summer heat with a malfunctioned air conditioner is something we would hate to think of. During summer we would love to think of only cool and refreshing temperature. Often home owners make the mistake of testing their air conditioner only on the first day of summer ignoring the unit until then, which is a very bad idea. If you find out that your air conditioner is blowing hot air instead of cold air then it is not at all a good sign. Once you find out that your cooling unit is not blowing cold air, then check whether the unit is set in cool mode if not then change the setting to cool mode, if the settings are right and the unit is still not cooling then check for the next cause. If the air filters are dirty then it can effect the cooling. Clean or replace the air filters and check the cooling. Working an air conditioner with a clogged air filter would damage the coils. To avoid such damages clean or replace the air filters on a regular basis.
Another probable cause for your air conditioner to not work properly may be due to a damaged compressor. A damaged compressor can be repaired only by a professional so you need to call technician to get it fixed. Another cause for a malfunctioning air conditioner is a broken refrigerant. Cool air will not be pumped out if the refrigerant is not working properly. Call for professional help to get it fixed.