To limit the probability that the energy model calculation method will not accurately or appropriately account for the electricity capacity of the circulation fan in the forced-air system in the proposed house where it has a lower flow rate than the circulation fan in the reference house, which could lead to inaccuracy in the calculation of energy consumption by HVAC equipment, which could lead to inaccuracy of the model, which could lead to 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.