We have used SUNDANCE Energy Services Inc. for over 30 years. They are absolutely the greatest! Very courteous, and very professional. They always take the time to fully explain things. They were out here just recently for the annual service check. They changed the filter in the furnace, and checked out the fireplace. They really know what they are doing. I can not say enough good things about them! Just a very good and dependable company! Like I said before, the greatest!