When it comes to air conditioning for buildings and in particular when it comes to air conditioning using air cooled direct expansion systems, every one degree increase in ambient temperature has a significant impact on power demand and efficiency of the unit.

The key reason for this is that like any heat transfer device, an air-cooled air conditioning unit requires a temperature differential  between the ambient air and the heat transfer medium, the refrigerant gas. During air conditioning cooling mode operation, the larger the differential between the hot refrigerant gas and the…