Nate Core Practice Test 2025 - Free Practice Questions and Study Guide

Improper air filtration can lead to decreased indoor air quality and potential health issues because it allows contaminants such as dust, allergens, mold spores, and pollutants to circulate freely within indoor environments. Effective air filtration is essential for trapping these harmful particles, which, when not adequately filtered, can exacerbate respiratory conditions, allergies, and other health problems. Moreover, lower air quality may result in discomfort and reduced productivity in occupants.

In contrast, reduced HVAC unit costs, improved energy efficiency, and quicker heating of spaces are benefits associated with proper air filtration and system maintenance. When air is properly filtered, HVAC systems can operate more efficiently, which can help control costs and improve energy consumption. However, if air filtration is inadequate, these benefits are often compromised, leading primarily to the negative consequences highlighted in the correct answer.