Removed old HVAC equipment and installed a new YORK high efficiency gas furnace and cooling unit. Metal duct was properly sized and in great shape, but insulation had deteriorated, so we mastic air sealed all duct, installed new duct insulation, and foam encapsulated supply boots at registers and supply plenum. Enlarged return air ducting for improved flow. Replaced Freon lineset, all new drain lines with safety device for equipment, new stat, and two maintenance visits in future at no charge.