Service maintenance refers to a program of regular preventive care for most major appliances, including heating systems. The service maintenance agreement is usually obtained through the heating services contractor, and can save the homeowner money by preventing costly repair bills. In addition, purchasing such an agreement can provide you with greater operational efficiency when you take advantage of regular maintenance service schedules. If your heating system is properly maintained, it should save you money by operating more efficiently. Contact your local heating professional for more specific information.