Dedicated outside air systems (DOAS) with heat recovery ventilation are now required in some jurisdictions, including Washington State. This table details the key elements that differentiate advanced performance DOAS—previous known as very high efficiency DOAS—from the more typical DOAS with heat recovery required by Washington State Energy Code (WSEC 2021).

Washington State University’s Shelby Ruiz breaks down a commercial building HVAC design approach that can help designers exceed Washington State Energy Code while reducing viral risk and improving thermal comfort and indoor air quality. Hear from Ruiz as she explains how advanced performance DOAS aligns with and departs from the recent updates to the Washington State Energy Code.