The performance curves used for the

The performance curves used for the reference building model show that capacity continues to increase as outdoor temperature decreases since these performance curves allow extrapolation Conversely, the energy input ratio performance curves shows a slight upward trend at very cold conditions (extrapolated result). These trends may or may not accurately reflect actual performance at these colder outdoor conditions. The large difference between the reference building performance curves and the VRF or HP curves is relatively insignificant since cooling operation primarily occured at the higher outdoor temperatures where the curves are similar.