Refrigeration and Air Conditioning Mechanics (313A) Exam 2026 – 400 Free Practice Questions to Pass the Exam

A relative humidity level of around 50% is typically considered optimal for human comfort. This level strikes a balance that allows the body to effectively regulate temperature through the evaporation of sweat, facilitating comfort in varying temperatures. When humidity levels fall too low, around 30% or below, individuals may experience dry skin, irritation in the respiratory tract, and other discomforts. On the other hand, excessively high humidity, particularly at or above 60%, can lead to a feeling of mugginess and reduced effectiveness of perspiration in cooling the body, potentially making environments feel hotter than they actually are. Therefore, maintaining relative humidity around the 50% mark not only enhances comfort but also supports better indoor air quality and overall health.