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Orange County <br /> Effective: July 1 , 2013 <br /> Attachment <br /> From American Society of Heating, Refrigeration <br /> and Air Conditioning Engineers (ASHRAE) Standards <br /> 1 . Thermal comfort is that condition of mind that expresses satisfaction with the <br /> thermal environment. There are large variations, both physiologically and <br /> psychologically, from person to person, which makes it difficult to satisfy <br /> everybody in a space. The environmental conditions required for comfort are not <br /> the same for everyone. However, extensive laboratory and field data have been <br /> collected that provide the necessary statistical data to define conditions that a <br /> specified percentage of occupants will find thermally comfortable. <br /> 2. This standard specifies the combinations of indoor space environment and <br /> personal factors that will produce thermal environmental conditions acceptable <br /> to 80% or more of the occupants within a space. The environmental factors <br /> addressed are temperature, thermal radiation, humidity, and air speed; the <br /> personal factors are those of activity and clothing. <br /> htt ://www.ccnstructionbook.ccm/xq/ASP/Product)D. 695/id.402/subl D.636/qx/def <br /> ault2.htm <br /> 3. ASHRAE Standard 55-1992 Thermal Environmental Conditions for Human Occupancy, <br /> recommends the following acceptable temperature ranges at relative humidity (RH) of <br /> 50% and air speed less than 0.15 m/sec. (30 fpm). <br /> Acceptable Temperatures <br /> Season Clothing Temperature <br /> Winter Heavy slacks, long sleeve shirt 20-23.5°C <br /> and/or sweater (68-75°F) <br /> ,, <br /> Summer Light slacks and short sleeve 23-26°C <br /> shirt (73-79°F) <br /> http://www.ccohs.ca/oshanswers/phys agents/hot cold.html <br />