A heating degree day (HDD) or cooling degree day (CDD) is an index used to determine the amount of energy needed to heat or cool a building. The number of heating or cooling degrees in a day is defined as the difference between a base temperature – 65° Fahrenheit – and the outside temperature. If, for example, the temperature outside is 55° F, then we would say it is a ten-degree day. Organizations, such as the State of Iowa, use this information to estimate seasonal heating and cooling demands.
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|
Jan
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Feb
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Mar
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Apr
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May
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June
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July
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Aug
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Sept
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Oct
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Nov
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Dec
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
HDD
|
1469
|
1151
|
904
|
501
|
222
|
44
|
10
|
31
|
136
|
462
|
881
|
1320
|
|
CDD
|
0
|
0
|
1
|
3
|
66
|
180
|
275
|
218
|
67
|
10
|
0
|
0
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