Upon arrival customer stated that ac unit had not been working since Friday. Stated that system did freeze and they had someone out, once filter was changed unit still did not cool properly. After inspection of 20 year old system found that outdoor unit did not have 24 volts going to contactor to pull in. Found that wire coming from contactor to capacitor were burnt wires. Contactor very pitted and so is the capacitor. Tested windings for fan motor and compressor and found that both have failures. Condenser coils very dirty as well. Checked furnace in crawl space. Insulation is falling off the supply plenum, duct work is very old. Furnace is not in good shape there is a lot of rusting in the housing of burners and heat exchanger, there are wires tied together in furnace. Disconnect switch is hanging and not attached properly. Blower motor capacitor is testing bad, blower motor is failing, and blower wheel is very dirty. Due to unit being obsolete and the many failures highly recommend