• Air conditioners can freeze up due to poor airflow.Jupiterimages/Comstock/Getty Images
  
  Air conditioners are a nice feature in a home in the summertime as long as they are working properly. However, when the unit fails, they can turn into a costly problem. Knowing some of the reasons why the air conditioner stopped working may save you some time and money in the long run when the repairman comes to inspect the air conditioner.
  
  

Airflow

• In many cases the air conditioner can stop working because a lack of airflow has caused the system to freeze up. Systems are set up with the number of vents they have for a reason, and closing some of them off can create airflow issues. Also, filters that are clogged with debris will cause airflow issues. If the air that the unit cools cannot move out and into the house, the cold air backs up in the unit and makes it colder than it should be, which will freeze up the system. However, if the warm air from the house cannot be pulled in through the intake filter so that it can be cooled again, this will also cause too much cold air in the system.
  
  

Blower Moter

• A simple cause for the system not to work is that the blower motor has burned out. You can't do anything about this other than replace it. However, to keep it running as long as possible, you must maintain the system airflow properly.
  
  

Ducts

• Ductwork must be in place for air to flow through the house vents. If you have a leak in your duct, not only is the system going to run more frequently, but your house is not going to get cool. The overuse will cause the system to fail sooner rather than later.
  
  

Freon

• A leak in your cooling system will allow the freon to escape. Low freon will freeze your system up and eventually keep it from cooling at all. A unit running on low freon will burn out more quickly because it will constantly run even through it is putting out no air.