Variable Refrigerant Flow (VRF) systems employ the use of multiple indoor evaporators and one common condensor unit. The systems are ductless; rather than circulating air or waterthroughout the house, refrigerant is pumped from the condensing unit and compressor to the distributed evaporators in the house. Commonly used in Japan for many years, VRF systems are relatively new in the US. VRF systems have many benefits over traditional systems,particularly energy efficiency benefits, lower maintenance, installation benefits, and higher levels of control.

VRF is suited to the Smart House because of the modularity of the system. Evaporator units are lightweight and compact, which eliminates bulky ducts in the house and allows for multiple comfort zones and a higher level of control. Due to the ductless nature of the system, duct losses are eliminated, saving energy. Since evaporator units are modular, we have expanded options for energy monitoring and control. Many evaporator configurations are available, such as recessed ceiling evaporators, floor units, or wall mounted units.

More Information:

ASHRAE VRF Overview