Natural ventilation, operable windows, clerestory windows, solar chimneys, wind catchers, passive ventilation systems, green roofs, living walls, urban heat island mitigation, cool roofing materials, shading devices, overhangs, louvers, mesh screens, evaporative cooling systems, desiccant cooling systems, radiant floor cooling, displacement ventilation, personalized ventilation systems, air-side free cooling, water-side free cooling, natural convection, stack effect, cross-ventilation, single-sided ventilation, clerestory-effect ventilation, thermal mass activation, night-time radiative cooling, mixed-mode ventilation.