There are several reasons your air conditioner may not be functioning properly, but typically it is one of following things:
The refrigerant is low, or there is a leak
The thermostat is not reading the correct temperature and is faulty
The Unit has a drainage problem
You have a clogged or dirty filter
The compressor or fan is worn out
The ductwork is clogged or constricted
The ductwork is leaking air
Note: One of the most common problems we see is the improper operation of your air conditioner. Please be sure you have all doors and windows to the outside closed when operating your air conditioner.