Performed AC diagnostic on 2005 York condensing unit. Upon my diagnostic came across a few points or concerns 1. Found that all indoor ductwork was not insulated and also had asbestos insulation. No insulation has caused all the ductwork to rust out due to condensation. 2. Dust in debris has built up within the indoor blower cabinet due to no filter in place 3. System contains a R 22 refrigerant leak due to past companies charging up system at least twice already and Injected a sealant. 4. System has leaked out R22 leak Once again but is slightly low Recommendation- 1. Find leak and repair in charge up with R22 2. System replacement options