National Home Inspector Practice Exam 2025 - Free Home Inspector Practice Questions and Study Guide

The condition and cleanliness of the air filters in HVAC systems are crucial for several reasons. Air filters play a vital role in maintaining indoor air quality by trapping dust, allergens, and other particulates. When filters are dirty or clogged, they can impede airflow, leading to reduced efficiency of the HVAC system. This inefficiency may cause the system to work harder, increasing energy consumption and potentially leading to higher utility bills.

Moreover, failing to change or clean the air filters regularly can lead to more serious issues, such as overheating of the system, increased wear and tear on components, and in some cases, complete system failure. Inspecting air filters is a relatively simple yet highly effective way to ensure that the HVAC system operates smoothly, maintains proper indoor air quality, and extends the lifespan of the unit. Thus, this makes it a critical factor during an inspection of HVAC systems.