To limit the probability that the energy model calculation method will use a supply cold water temperature that is random and not based on heating degree-days or ground and air temperatures, which could lead to inaccurate estimation of the energy used for service water heating,
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.