Air Conditioning Repair Certification (ETI) Practice Exam

Improper installation of ducts is a significant factor that can lead to air leaks in an AC system. When ducts are not correctly sealed or fitted, gaps and joints can occur, allowing conditioned air to escape before it reaches its intended destination. This loss of air not only reduces the efficiency of the air conditioning system but also can lead to increased energy costs and uneven cooling throughout the space. Proper installation involves ensuring that all joints are sealed, ductwork is properly insulated, and there are no obstructions that could impede airflow.

Other factors listed, such as high humidity levels, using faulty refrigerants, or excessive noise from the unit, do not directly contribute to air leaks. High humidity can affect comfort levels and the overall performance of the AC but does not typically relate to physical leaks in the ductwork. Faulty refrigerants can lead to inadequate cooling but are not a cause of leaks in the duct system. Excessive noise can indicate operational issues with the AC unit but does not relate to airflow escaping through the ducts. Thus, the link between proper duct installation and air leaks is fundamental in understanding the efficiency and effectiveness of an air conditioning system.