Condenser is 21 Years old, indoor furnace is 21 Years old, indoor Evaporator model/serial unavailable due to being blocked by metal ductwork could not determine age. Dust and debris throughout Return chase, Indoor Evaporator Coil is dirty and needs thorough chemical cleaning, outdoor condenser coil and needs thorough chemical cleaning. Outdoor Schrader leaking Freon slowly and will impact performance and eventually stop cooling. Metal ductwork needs to be re-insulated, copper line set needs to be insulated, indoor blower capacitor out of range and needs to be replaced, outdoor capacitor out of range and needs replacement. No float switch present in drain pan. Temperature split in cooling below average, heating split was average.