I completed diagnostics and found the filter plugged. I removed but there was not another filter on site. A 16x25x1 was pulled out of the blower compartment. I recommend a 16x25x4 to add into the filter cabinet. I noticed urine on unit. This can eat away at the coil causing issues and leaking of refrigerant. The system is estimated 3 pounds low on r22 refrigerant. Based on age (18 years old), cost of seen and unseen repairs, having the outdated refrigerant, condition, lack of efficiency and not having a warranty I recommend replacement of AC. I quoted replacement. The homeowners purchased new AC, paid in full. 137341
