To limit the probability that the energy model calculation method will account for the effect of exterior manually-operated fenestration blinds and shading systems or interior blinds on solar heat gain from fenestration, which could lead to occupant-dependent factors being treated inconsistently in the calculations, which could lead to inaccuracy of the model, which could lead to overestimation of the energy used by the reference building or underestimation of the energy used by the proposed building, which could lead to excessive use of energy, which could lead to an unacceptable effect on the environment.