Upon arrival inspected furnace and was not finding major concerns. Heat exchanger showed no signs of cracks, but combustion numbers were dangerously high at 400ppm COAF heat exchanger has failed and needs replaced or system entirely needs replaced. Recommend replacement consultation. Ac unit is operational and advised homeowner of new refrigerant and risks of 410. Recommended to stay with old refrigerant for as long as it keeps up unless quote accommodates otherwise.
