6 systems, gas 90% ranging from 2010-2014. Home was empty, Brother of homeowner was there to allow me to at least locate and gather information from the systems to determine the best course for the property. Homeowner is selling and is in negotiations with a buyer; and on an inspection report there was talk about the cleanliness of the ducting. To best serve, I looked into all 6 units (4 on main, 2 on addition). Level 2 duct cleaning is recommended. This includes duct cleaning (including supply vents) blower wheel pull and clean x6, evaporator coil cleaning x6, decontamination of 6 indoor units, microbial misting through all 6 systems (this lines the ducting after cleanings preventing biological growth). Level 1 duct cleaning is just the ducting system with supply vent clean and microbial misting. Briefly spoke to Teeter on his brother phone. Emailed estimates. He will give us an answer after the weekend.