Solution: The performance of an air conditioner involves several factors. I am assuming that your unit is operating okay, but is not cooling the area for which it is intended.
In trying to determine why is my air conditioner not cooling, you should first check the circuit breaker, or the fuses. You could also check to see if the thermostat was properly set.
If all these checks reveal no problems, then the unit may require recharging with refrigerant. You may need the services of a technician, if you are not sure how to recharge the refrigerant.
The location of your unit is important. If your unit is not large enough for the area it is intended to cool, then it will not function efficiently.
What is the size of the unit? The cooling capacity is measured in British Thermal Units (BTU), with the cooling capacity of a room unit ranging from 5,000 to 14,000 BTU per hour.
The efficiency of the unit in the cooling of the room, depends on its size. A larger unit does not necessarily perform better, as it may not cool an area evenly, whereas a smaller unit could be more efficient, over an extended period of time.
Is the location of the unit near a corner of the room? Can it send the airflow needed to cool the designated area? The blowers of the units are not very powerful, and are not built usually to cool connecting rooms. There are not generally designed to provide cool air in more than one open area.
If after using the trouble shooting tips mentioned above, your problem still exists, then you may need to purchase another window air conditioner or portable ac unit. It should be installed at the other end of your home.
Keep the additional AC unit on the same floor as the current one, if your home consists of more than one floor. Heat rises so you will need additional cooling upstairs. Although this may not be what you want to hear, you need to remember that portable units are only intended to cool one open area.