total certified projects and ~1.6 million ft² certified in 2024 alone, with 4.4 million ft² design-certified that year. While early adoption concentrated in German-speaking countries and Scandinavia, certified projects are now documented across diverse climate zones, including hot-humid and tropical regions.

History

The term passive house was originally used in the 1970s for buildings emphasizing passive solar strategies. Since the 1990s, it instead denotes meeting specific quantified PHI

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