HVAC - EPA Certification Practice Exam 2025 - Free EPA Certification Practice Questions and Study Guide

The filter in HVAC systems serves multiple important functions, one of which is to protect the compressor from debris and dust. The compressor is a critical component of the air conditioning or refrigeration system, as it compresses the refrigerant and circulates it through the system. If debris or dust enters the system, it can lead to mechanical damage, reduced efficiency, or even complete failure of the compressor. By filtering out these contaminants, the system helps ensure that the compressor operates smoothly and lasts longer, maintaining overall system integrity.

Other options, while they may seem relevant, do not accurately describe the primary purpose of the filter. For instance, cooling the refrigerant or controlling humidity levels involves other components within the system, such as the evaporator and the desiccant respectively. Improving airflow speed is more about fan performance and duct design rather than the function of the filter, which is primarily to maintain cleanliness and protect system components.