ASHRAE 90.1 is an American National Standard published by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) which provides minimum requirements for energy-efficient designs for buildings except for low-rise residential buildings. 

The original standard was named ASHRAE 90 in 1975 which was later updated to be ASHRAE 90.1 in 2001. Also, in 1999 the ASHRAE Board of Directors voted to place the standard on continuous maintenance, based on changes in energy technology and energy prices. ASHRAE 90.1 has been updated in 2004, 2007, 2010, 2013, and 2016 to reflect the latest changes and efficient technologies.

Standard 90.1 has been a benchmark for commercial building energy codes in the United States and a key basis for codes and standards around the world for more than 35 years. Cove.tool supports 3 versions of ASHRAE 90.1 which are 2007, 2010, and 2013. Also, cove.tool takes care of selecting the default version of ASHRAE 90.1 accepted by each state in the United States when you enter the location of your project. 

Find out more about ASHRAE 90.1 here.

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