How can I guesstimate U-Factors for older unmarked windows? I do work legalizing unpermitted dwellings, of which my area has tens of thousands.   These were all built at a time when… How can I guesstimate U-Factors for older unmarked windows? I do work legalizing unpermitted dwellings, of which my area has tens of thousands.   These were all built at a time when…Read MoreGreenBuildingAdvisor

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