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==Application==
The CLTD/CLF/SCL method uses predetermined set of data to expedite and simplify the process of cooling/heating load approximation. The data is divided into many different sections based on many different variables. These variables include, building material of the envelope, thicknesses of the building materials, day of the year, time of day, orientation of the surface (e.g. wall or roof, 90 degrees or 180), and wall face orientation (cardinal directions, i.e. N, NW, S, SE, etc.), to name a few. In order to determine which set of CLTD/CLF/SCL data to look at, all the requisite variables must be defined.<ref name=SML/>
The respective tables of data were generally developed by using the more complex [[transfer function method]] to determine the various cooling loads for different types of heating.<ref name=MS/><ref name=Matalas>Matalas, Gintas P. 1972. Transfer Function Method of Calculating Cooling Loads, Heat Extraction And Space Temperature, ASHRAE Journal. Vol. 14, No. 12: 54–56.</ref> The results gained by doing so are then normalized for each type of heat gain used for the tables, CLTD, CLF, and SCL.<ref name=Lindsey>Lindsey, K. 1991. Revision of the CLTD/CLF Cooling Load Calculation Method. M.S. thesis, Oklahoma State University.</ref>
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