Which factors are addressed to control thermal comfort under IEQ?

• A. Lighting levels
• B. Noise levels
• C. Temperature, humidity, and air movement
• D. Color temperature and accents

Answer: (C)

Thermal comfort in IEQ centers on how warm or cool occupants feel, which depends on environmental conditions and how the body exchanges heat with the surroundings. The main factors you can control to influence this sensation are room temperature, relative humidity, and the movement of air across the body. Temperature sets the overall warmth or coolness of the space; humidity affects how effectively sweat evaporates, altering perceived comfort at a given temperature; and air movement changes heat loss from the body, making a space feel cooler with higher air flow or warmer with stagnant air. Lighting and color aspects relate to visual comfort and aesthetics, while noise affects acoustic comfort; neither directly alters the thermal sensation. Thus, temperature, humidity, and air movement are the factors addressed to control thermal comfort under IEQ.