I live in Zone 4A – 2 story home built circa 2005. Air handler and HVAC ducts are in the attic. The upstairs HVAC equipment was replaced in 2015 with… I live in Zone 4A – 2 story home built circa 2005. Air handler and HVAC ducts are in the attic. The upstairs HVAC equipment was replaced in 2015 with…Read MoreGreenBuildingAdvisor

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