Certified Apartment Maintenance Technician (CAMT) Practice Exam 2025 - Free CAMT Practice Questions and Study Guide

An air filter primarily improves system efficiency by trapping dust, dirt, allergens, and other particles from the air that circulates through the HVAC system. By removing these contaminants, the filter helps maintain optimal airflow within the system, which directly contributes to its performance. Clean filters allow the HVAC unit to operate more efficiently, reducing the strain on the system and potentially lowering energy costs. When an air filter is clogged or dirty, it can create airflow restrictions, leading to reduced efficiency and potentially causing the system to work harder to maintain desired temperatures. This can result in higher energy consumption and more frequent repair needs, making regular filter maintenance a fundamental aspect of HVAC upkeep.

Other options, such as heating the air, reducing noise levels, and controlling humidity, do not primarily describe the function of an air filter within an HVAC system. Heating is achieved by the furnace or heating element, noise levels are more related to the overall design of the system, and humidity control is typically managed through specific equipment like dehumidifiers or humidistats, rather than the air filter itself.