The computation techniques specified in this guideline serve as modules for computations of the instationary thermal response of rooms and buildings; they are, therefore, part of the room model as per VDI 6007 Part 1. Contrary to other techniques, the computation of long-wavelength incident and emitted radation during the cooling design period (CDP) is limited to the computation of the cooling load as specified in VDI 2078, or of room temperatures; it does also apply, though, to a heating design period (HDP) in the case of a computation of the instationary heating load.