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ASHRAE Membership

ASHRAE membership is open to any person associated with heating, ventilation, air conditioning or refrigeration. ASHRAE is unique because its membership is drawn from a wide range of disciplines relating to the HVAC&R field. Over 56,000 individuals from more than 100 nations belong to the Society.

Discounts on Publications

ASHRAE members earn 15% off publications. Hundreds of titles are available including the complete collection of ASHRAE Standards including 90.1, 62.1 and 189.1.

Develop Leadership Skills

When you join ASHRAE, you are making an investment in yourself. When you become active in the Society by giving your time and sharing your knowledge, you get even more out of that investment.

Network with Industry Professionals

Each month, all over the world, ASHRAE chapters convene for an informational program featuring a speaker or topic that is key to professionals in the industry. Meet with your peers and share ideas.
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Resources & Publications

ASHRAE Terminology


ASHRAE Terminology, a free resource, is a comprehensive online glossary of more than 3700 terms and definitions related to the built environment, with a focus on heating, ventilating, air conditioning, and refrigeration (HVAC&R), as well as building envelope, electrical, lighting, water and energy use, and measurement terms.

This searchable glossary was designed for use by engineering professionals but is also useful for architects, building owners and operators, educators, public officials, and homeowners.

The terms in ASHRAE Terminology have been assembled and defined and are updated on an ongoing basis by ASHRAE Technical Committee (TC) 1.6, Terminology. TC 1.6 is concerned with terminology, nomenclature, definitions, abbreviations, symbols, and the International System (SI) and Inch-Pound (I-P) units used in the fields of heating, ventilating, air conditioning, water heating, and refrigeration.

Start using ASHRAE Terminology >>

Also see the ASHRAE SI Guide for HVAC&R.


Popular Search Terms

Recently, users have been interested in finding more information about these search terms:

  • auxiliary
    • auxiliary air - unconditioned or partially conditioned supply or supplemental air delivered to a laboratory at the laboratory fume hood to reduce room air consumption.
    • auxiliary devices - (also known as controls), equipment such as relays and switches to manipulate signals.
    • auxiliary energy see auxiliary thermal source.
    • auxiliary fuel - fuel used in an auxiliary thermal source.
    • auxiliary thermal source - a source of thermal energy, other than solar, used to provide the service water heating, usually in the form of electrical resistance heat or thermal energy derived from combustion of fossil fuels.
  • cowl - air terminal device intended to be installed above a natural ventilation exhaust duct with the aim (by creating negative pressure and depending on wind speed) of avoiding reverse flow and increasing flow rate. It may or may not have moving parts.
  • energy efficiency ratio (EER) - (1) ratio of net cooling capacity in Btu/h to total rate of electric input in watts under designated operating conditions. (2) ratio of the net total cooling capacity to the effective power input at any given set of rating conditions, in watts per watt.
  • ice maker - automatic ice-making machine in which ice is formed, harvested, and stored.
  • irradiance - (1) at a point of a surface, quotient of the flux incident on an element of a surface containing the point, divided by the area of that element, measured in watts per square meter. (2) radiant flux density. See also solar irradiance.
  • solar irradiance - rate at which solar energy is received, per unit area. See also irradiance.


ASHRAE Publications

You may be interested in these ASHRAE publications: