Explain the difference between passive and active cooling strategies and give tropical examples of each.

• A. Passive: shading, ventilation, daylighting; Active: fans, air conditioning, dehumidification; tropical contexts often rely on passive prominently.
• B. Passive cooling includes fans and dehumidification; active cooling includes shading and daylighting.
• C. Active cooling is never used in tropical climates.
• D. Passive cooling requires mechanical systems.

Answer: (A)

The main idea is that cooling can come from the building design and its environment (passive) or from mechanical systems (active). Passive cooling relies on design features that cut heat input and promote natural heat removal: shading devices keep the sun off walls and roofs, and daylighting is used with strategies that minimize heat gain while still providing light; ventilation uses openings, winds, and building layout to create cross-ventilation and stack ventilation so air moves through the spaces. In tropical climates, these passive approaches are emphasized because they reduce heat buildup and energy use, making interiors comfortable without relying on machines. Active cooling relies on equipment like fans to move air, air conditioning to lower temperature, and dehumidification to reduce humidity, used when passive methods aren’t enough. The tropical message is that passive cooling is the primary tool, with mechanical cooling as a supplement when needed.