The air conditioning is of vital importance to the comfort of operating the heavy-duty equipment, especially in the seasons when the temperature is elevated. However, the working environment of the air conditioning system of the heavy-duty equipment is of an extremely harsh character—unceasing vibration, suffocating dust, and endless utilization—such conditions are making the system more easily to become damaged. Therefore, the question of how long the air conditioning can be used in the daily operation of the equipment is one worthy of concern. For this reason, this article will be making a realistic evaluation of the average service life of the heavy equipment air conditioning system, exploring the factors which are influencing its longevity, identifying the warning signals of the failure, and providing the practical techniques to extend its lifespan, thereby assisting you to maintain the operator in the cool condition and to ensure the smooth proceeding of the project.