E C B1 B2 T where

C = the constant energy use above the change point, B1 = the coefficient or slope that describes the linear dependency on temperature, B2 = the heating change point temperature, T = the ambient temperature for the period corresponding to the energy use, + = positive values only inside the parenthesis.

The three-parameter change-point linear model for cooling is described by

C = the energy use at the change point, B1 = the coefficient or slope that describes the linear dependency on temperature below the change point, B2 = the coefficient or slope that describes the linear dependency on temperature above the change point B3 = the change-point temperature, T = the temperature for the period of interest, + = positive values only for the parenthetical expression.

The four-parameter change-point linear cooling model is given by

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