Change your filters. We will remind you on Facebook at the beginning of every month.
Clean the drain line. Pour a little bit of bleach down the drain line pipe every six months — that will reduce the amount of algae build up in the drain line and reduce the chance of the drain line filling up with water.
Clear the bushes. Check for efficient air-flow around your unit. Make sure your air conditioner has plenty of “breathing” room. Avoid enclosing or covering it; keep leaves, plants and other vegetation at least 18″ away.
Schedule maintenance. Your home's units should be tuned up at least once per year.