???? ????? ???????/ ????? ??????? ??????? / routine maintenance ??????? ??????/ ?????? /central air conditioners ?????/ ??????? / inspection meticulous ???????? ??????? ??? ????????/ ???? ??????/ the motor ? ??????? ???????/the heat exchanger ? ??? ???? ?????/ ????? ???? check here / thorough cleaning ???????? ? ?????? ??????/air filter . ?????? ??