[header] How to keep your ac running strong [title] Have your unit serviced regularly. [substeps] One of the best things you can do to ensure that your air conditioner remains functional is to have the unit serviced on a regular basis. Regular service is important, because it will keep the unit performing optimally. 
Also, service and repair should always be performed by a licensed technician. Performing maintenance on your own could lead to more severe problems, and could void any existing warranties on the unit.