Complete 2 system furnace repair and preventative maintenance check. Found upstairs system 33 years old. Heating but struggling. It needs to be replaced soon. The downstairs system is low on refrigerant and has concerning amounts of mold in ducts and in system. Recommend replacing the evaporator coil to fix the leak and installing a pure air system to better filtrate the air and kill any bacteria, mold, allergens, and odors in the house to improve the wellness of residents.