Came out here today to Capri ave for a planned service maintenance. Ran system checks and cycled furnace and everything is within manufacturers specifications. Filter was dirty after what appears to be a month indicating heavy dust accumulation and a duct cleaning being required. Recommend upgraded filtration system to better protect the furnace and help with dust reduction. Duct cleaning scheduled for friday morning. Homeowner has paid for half the duct cleaning today with the remaining half being paid on Friday.