Builders hoping to meet the Passivhaus energy efficiency standard can now choose between four window manufacturers in North American, three in the U.S. and one in Canada. A fifth, also in the U.S., is said to be close to winning certification.
Two of the manufacturers have had windows certified by the Passivhaus Institut (PHI) in Germany, the other two by the rival U.S. organization, Passive House Institute U.S. (PHIUS).
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