We agree to provide you with our "Sure Comfort" tune-up and cleaning of your heating and/or air conditioning system at the frequency either you request or manufacturers approved time intervals. Your furnace will be as clean as new. Note: some fuel furnaces require a power vacuum to clean the heat exchanger, which is not included. If so we will advise and make arrangements at additional cost if requested. Air duct cleaning is not included but can be arranged for at a competitive rate. Work will be scheduled at your convenience during regular business hours.