What term describes a cooling approach that maintains a comfortable indoor temperature without relying on energy-intensive equipment?

• A. Active cooling
• B. Mechanical cooling
• C. Central AC
• D. Passive cooling

Answer: (D)

Passive cooling describes cooling a building through design and environmental strategies rather than powered equipment. It relies on architectural features and site choices to keep indoors comfortable without using energy-intensive systems. Think shading devices that block direct sun, orientation and openings that promote natural cross-ventilation, and materials with high thermal mass or good insulation that slow heat flow. In practice, a well-designed building can stay cooler by letting cool outdoor air enter and hot indoor air escape, and by storing heat when it’s hot so it’s released later when it’s cooler.

This approach contrasts with active or mechanical cooling, which relies on energy-powered equipment like fans, compressors, and refrigerants to lower temperatures, such as central air conditioning.