Heating and Cooling Degree Days Page: 4 of 5
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A4 Climate Change Indicators in the United States: Heating and Cooling Degree Days
www.epa.gov/climate-indicators - Updated August 2016
Figure 3. Change in Annual Cooling Degree Days by State, 1955-2015 Versus 1895-1954
-450 -350 -250 -150 -50 50 150 250 350 450
This map shows how the average number of cooling degree days per year has changed in each state over
time. The map was created by comparing the first 60 years of available data (1895-1954) with the most
recent 61 years (1955-2015). "Warmer" colors indicate an increase in temperatures between the two
periods, leading to more demand for air conditioning-that is, more cooling degree days. "Cooler" colors
indicate a decrease in temperatures, leading to less demand for air conditioning-that is, fewer cooling
degree days. Visit this indicator online at: www.epa.gov/climate-indicators for an interactive version of
this map.
Data source: NOAA, 2016s
Heating and cooling degree days suggest how temperature changes affect energy demand, but they do
not necessarily reflect actual energy use. Many other factors have influenced energy demand over time,
such as more energy-efficient heating systems, the introduction and increasingly widespread use of
cooling technologies, larger but better-insulated homes, behavior change, and population shifts (such as4
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United States. Environmental Protection Agency. Heating and Cooling Degree Days, text, August 2016; (https://digital.library.unt.edu/ark:/67531/metadc949361/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.