Constant stopping, starting and continual operation will wear down any machine if the proper care and maintenance is not performed.  Your system works hard to keep you comfortable.  Having regular maintenance performed will help extend the life of your equipment as well as guard against common failures. Most manufactures will void  the warranty without annual preventive maintenance. Prillaman uses a 13 point checklist and recommends a spring and a fall maintenance to help insure your air conditioning and heat are ready when you need them.  We can also check air filters, humidifiers, and other whole house products.