Heating tune up in Flowery Branch. Tested operation of 1 system. Discovered system with heavy a,out of organic growth, dirt blower wheel, dirty ductwork, no water safety, weak secondary controller, failing outdoor fan motor, worn main electrical switch, bypassed outdoor disconnect, compressor sounding rough, and dirty indoor coil. System is is rough shape and is 15 years old. Typical lifespan of a system is 10-15 years. Due to high repair cost replacement is HIGHLY recommended.