Low-Energy Cooling Strategies for Natural Buildings — FarmPal
Passive cooling reduces or eliminates AC in most climates. Stack ventilation: high openings exhaust hot air while low openings admit cool air a 20 ft ceiling height difference creates ~1 mph airflow at zero energy cost. Night flush cooling: open the building at night when outdoor temps drop below indoor (works best with >15°F diurnal swing), then seal at dawn thermal mass absorbs coolness and releases it all day. Earth tubes: bury 100-200 ft of 8-12" diameter pipe 6-8 ft deep where soil holds 55-60°F year-round; incoming air drops 15-25°F before entering the building. Courtyard effect: enclosed courtyards with water features and shade create micro-climates 5-10°F cooler than surroundings. Modern research (post-2020) confirms these strategies can maintain indoor temps below 78°F even when outdoor temps exceed 100°F in dry climates, and below 82°F in humid climates when combined with dehumidification.
Passive cooling reduces or eliminates AC in most climates. Stack ventilation: high openings exhaust hot air while low openings admit cool air a 20 ft ceiling height difference creates ~1 mph airflow at zero energy cost. Night flush cooling: open the building at night when outdoor temps drop below indoor (works best with >15°F diurnal swing), then seal at dawn thermal mass absorbs coolness and releases it all day. Earth tubes: bury 100-200 ft of 8-12" diameter pipe 6-8 ft deep where soil holds 55-60°F year-round; incoming air drops 15-25°F before entering the building. Courtyard effect: enclosed courtyards with water features and shade create micro-climates 5-10°F cooler than surroundings. Modern research (post-2020) confirms these strategies can maintain indoor temps below 78°F even when outdoor temps exceed 100°F in dry climates, and below 82°F in humid climates when combined with dehumidification.