ANSI/ASHRAE Standard 55-2020, Thermal Environmental Conditions for Human Occupancy is still THE standard for thermal comfort. Published since 1966. Continuously updated. Updated to align with the 2019 edition of ANSI/ASHRAE Standard 62.2, this user's manual provides sample calculations, best practices, and additional guidance for professionals concerned with ventilation and indoor air quality in residences. The addition of the thermal environmental control classification levels documentation requirement helps users, regulators, and rating systems recognize and promote the thermal comfort benefits of personal control over one's thermal environment. ashrae.org/55 VISIT AHR BOOTH C2906http://www.ashrae.org/55