Locating ERV Returns in Two-Story House

I’m adding an ERV to an existing 2 story home in zone 2 with separate HVAC systems per floor. The home tested 2.1 ACH50, is about 10 years old and… I’m adding an ERV to an existing 2 story home in zone 2 with separate HVAC systems per floor. The home tested 2.1 ACH50, is about 10 years old and…Read MoreGreenBuildingAdvisor