The American Society of Heating, Refrigerating and Air-Conditioning Engineers

The American Society of Heating, Refrigerating and Air – Conditioning Engineers (ASHRAE) is an international organiza­tion with over 50,000 members and numerous chapters located throughout the world. ASHRAE writes standards and guidelines to guide industry in the delivery of goods and services to the pub­lic. These standards and guidelines include uniform methods of testing for rating purposes, recommended practices in designing and installing equipment, and provide other industry-related information.

The original ASHRAE Standard 90-1975, “Energy Conservation in New Building Design,” was first published in 1975. The scope of this document covered both residential and commercial build­ings and became the historical and technical basis for most cur­rent model codes and standards for residential construction. Two

significant modifications to Standard 90 were 90A and 90B, pub­lished in 1980. These original ASHRAE standards served as the basis for ASHRAE Standard 90.2-1993 and the Model Code for Energy Conservation, published in 1977. This became known as the Model Energy Code (MEC) of the Council of American Building Officials (CABO) throughout the 1980s and 1990s. The Model Energy Code is now published as the International Energy Conservation Code (IECC) by the International Code Council (ICC).1

ASHRAE Standard 90.2, “Energy-Efficient Design of New Low – Rise Residential Buildings,” was first published in 1993. This stan­dard was specifically created to provide design requirements for the efficient use of energy for new residential dwellings that are three stories or less above grade. These include single houses, mul­tifamily structures (of three stories or fewer above grade), and manufactured houses (both mobile homes and modular homes).

This standard deals with the building envelope, heating equip­ment and systems, air-conditioning equipment and systems, domestic water-heating equipment and systems, and provisions for overall building design alternatives and tradeoffs. Compliance can be calculated using the prescriptive requirements method and the annual energy cost method (systems-analysis approach). Standard 90.2 has been modified since its publication by several published addenda and continues to be under “continuous maintenance” per ASHRAE procedures.