Call a professional: Each central air conditioner unit should be inspected, cleaned and tuned by a  professional. A professional tune-up typically costs between $89 and  $125. Keep the filter clean: Clean and replace the  air conditioner filter frequently (check the filter once a month). This  is especially important during the summer when dust and allergens  circulate. If the filter becomes clogged, your system will have to work  harder to supply the same amount of cool air. Made in the shade: Air conditioners with Read More...