ATLANTIC CITY, NJ — American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 90 was originally a single document. Then it was split into 90.1 and 90.2. A forum at the 2002 ASHRAE Winter Meeting asked, “Should Standards 90.1 and 90.2 Be Combined Into A Single Standard?”
The discussion centered on whether it would be advantageous to bring the two standards back together again. Standard 90.1 covers nonresidential buildings, while 90.2 is for residential buildings. The federal government has required states to adopt Standard 90.1 into their codes. However, the Model Energy Code, published by the International Code Council, is being used instead of 90.2.