ASHRAE Standing Standard Project Committee 55 (SSPC 55)
Thermal Environmental Conditions for Human Occupancy
Welcome to the Homepage of SSPC 55!
This project committee is responsible for maintaining ASHRAE Standard 55,
Thermal Environmental Conditions for Human Occupancy (ANSI Approved)
This standard specifies the combinations of indoor space environment and personal factors that will produce thermal environmental conditions acceptable to 80% or more of the occupants within a space. The environmental factors addressed are temperature, thermal radiation, humidity, and air speed; the personal factors are those of activity and clothing.
|ANSI/ASHRAE Standard 55 is under continuous maintenance by SSPC 55 for which the Standards Committee has established a documented program for regular publication of addenda or revisions.
ANSI/ASHRAE Standard 55-2013 is the latest
edition of Standard 55. The 2013 edition
combines Standard 55-2010 and the eighteen
approved and published addenda to the 2010
edition into one easy-to-use, consolidated
standard. The standard outlines conditions
in which a specified fraction of the
occupants will find the environment
thermally acceptable. The standard is
intended for use in design, commissioning,
and testing of buildings and other occupied
spaces and their HVAC systems and for the
evaluation of thermal environments. Because
it is not possible to prescribe the
metabolic rate of occupants, and because of
variations in occupant clothing levels,
operating set points for buildings cannot
practically be mandated by this standard.
Standard 55 was first published in 1966 and
republished in 1974, 1981, and 1992.
Beginning in 2004, it is now updated on a
regular basis using ASHRAE’s continuous
maintenance procedures. According to these
procedures, Standard 55 is continuously
revised by addenda that are publicly
reviewed, approved by ASHRAE and ANSI, and
published and posted for free on the ASHRAE
For more information on submitting a proposed change to this or any other ASHRAE Standard that is under continuous maintenance.
To download the latest published addenda to ASHRAE Standards
Click Here to sign up for the SSPC 55 Listserv
June 20, 2016