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14.4 2009 ASHRAE Handbook—Fundamentals. solar calculations because June 21 and December 21 represent the solstices (longest and shortest days) and March 21 and September 21 are close to the equinox (days and nights have the same length). Generating Design-Day Data; Estimation of Degree-Days ; Monthly Degree-Days; Annual Degree-Days; Representativeness of Data and Sources of Uncertainty ; Representativeness of Data; Uncertainty from Variation in Length of Record; Effects of Climate Change; Episodes Exceeding the Design Dry-Bulb Temperature The Society and its members focus on building systems, energy efficiency, indoor air quality, refrigeration and sustainability within the industry. Their website can be found at www.ashrae.org. B. BTU: A British Thermal Unit is a measurement of the amount of heat required to raise or lower the temperature of one pound of water one degree ... The International Code Council (ICC) is a non-profit organization dedicated to developing model codes and standards used in the design, build and compliance process.