Performed furnace maintenance on 2 2008 York furnaces. Cycled furnaces for heat. Verified proper heating sequence of operations. Temperature rise across heat exchangers is within range. Cleaned furnaces exterior as well as blower assembly and heating compartments. Ran systems through 20 point inspection checklist. Went over findings and recommendations with homeowner. Homeowner wants to hold off on any repairs as she does want to replace the system soon. Asked if we work with Costco, advised that we do not work with Costco but we can price Match accordingly. Left replacement filters. Cycled system, system is operational upon departure.