To limit the probability that the energy model calculation method will not accurately account for details of the reference house with regard to the recovery of sensible heat from a heat-recovery ventilator, 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.
To limit the probability that the energy model calculation method will not account for heat-recovery ventilation of the reference house in a manner that is consistent with the basis of the prescriptive requirements, which could lead to the energy model calculations not conforming to the energy performance level of the reference house, which could lead to overestimation of the building energy target, which could lead to excessive use of energy, which could lead to an unacceptable effect on the environment.