Stone and earthen floors absorb daytime heat, then release it once air cools. Open high windows or roof hatches after sunset to purge accumulated warmth. In humid climates, pair mass with ventilation paths that avoid condensing on cold surfaces, keeping comfort steady and mold at bay.
Vertical shafts power buoyancy: as warm air rises, it draws fresh air through lower inlets. Historic chimneys and even bell towers doubled as exhaust paths. Subtle baffles, insect mesh, and closable dampers let you regulate this engine without noise, fans, or unintended heat loss.