You don’t need a massive AC compressor to cool a house. A thermal chimney is a tall, black-painted hollow shaft built onto the sunny side of a house. As the sun beats on it, the air inside gets scorching hot and naturally rises out the top vent. This creates a powerful vacuum that violently sucks freezing cool air up from your basement or underground earth tubes, creating a constant, electricity-free breeze through the whole house. The HVAC lobby effectively banned this through modern “Energy Envelope” codes. By legally requiring homes to pass strict “Blower Door” air-tightness tests and mandating mechanical ventilation (HRVs), inspectors will fail any home that uses this brilliant open-air physics trick.
Source: OffGrid Secrets
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