I’ve just recently moved into a 1970’s house in Salem Oregon that could really use some significant HVAC and insulation upgrades…The roof is framed with 2×4 trusses and barely has… I’ve just recently moved into a 1970’s house in Salem Oregon that could really use some significant HVAC and insulation upgrades…The roof is framed with 2×4 trusses and barely has…Read MoreGreenBuildingAdvisor

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