I called to get our 21 year old furnas, which we bought from Mitchells, checked for winter. Because we have it maintained every year by Mitchellls One Hour Heating and Air Conditioning it is still going strong. We have a few minor parts replaced but I have platinum service so it was no cost. I just paid for new filter, which you can not buy at local stores. Our tech Mike was great! I asked him questions and he was very patient with me! I will buy our next furnas from Mitchells and purchase the main tank plan.