Demand call for downstairs system partially frozen. Upon arrival customer stated that the compressor was starting to freeze up. He did provide me with air filters today and mentioned that he changes them about every 4 months. During my inspection when I was taking the filter out the system sounded like drowning victim. I checked pressures, electrical components and connections, and checked temperatures. The system wasn’t low on refrigerant and the only air restriction I found was the dirty air filter. I brought up the dirt in the system and the rusted drain pans, but customer isn’t interested in replacing the drain pans or cleaning the ductwork. System is running and cooling at this time.