NATE Air Distribution Practice Test 2025 – Comprehensive All-in-One Guide for Exam Success!

Question: 1 / 400

What effect does high humidity have on an HVAC system’s performance?

Increases system pressure

Decreases system efficiency due to reduced air density

High humidity has a significant impact on an HVAC system's performance primarily by decreasing system efficiency due to reduced air density. When the air is more humid, it contains a larger proportion of water vapor, which weighs less than the same volume of dry air. This change in air composition reduces the overall density of the air.

As a result, the HVAC system needs to work harder to move the same volume of air, leading to an increase in energy consumption. The air handling units and fans might struggle with the lighter, less dense air, while also trying to maintain the desired indoor conditions.

Additionally, high humidity can complicate the process of cooling because the system must also remove moisture from the air. This added load can strain the cooling components and result in lower efficiency ratings. Thus, option B accurately captures this relationship between high humidity and HVAC system performance.

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Improves air distribution

Enhances overall comfort

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