Abstract
Abstract Degree-days are variables utilized for the planning, estimation and assessment of heating requirements and cooling demands of building interiors. Heating Degree-Days (HDD) are the number of degrees that a day's mean temperature is below 65° Fahrenheit (18° Celsius). Cooling Degree-Days (CDD) are the number of degrees that a day's mean temperature is above 65° Fahrenheit (18° Celsius). Long and short term climate changes have the potential to change heating and cooling. Original data were NOAA Climate Division areal averages for monthly total HDD and monthly total CDD. Raw data were downloaded from a NOAA online database. Univariate statistics for all eight North Carolina climate divisions were calculated. The time series of annual total HDDs and CDDs is complete from 1895 to 2017. A spline routine was fit through the series in order to best visualize trends. Results indicate that annual total HDD and CDD have changed over time, but the time series relationships are not linear. The most recent decades show that annual CDDs are rapidly increasing, while HDDs steadily decline. Energy demands for summer cooling will not be offset by decreased energy demands in winter.
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