The VRF or French VRF (Variable Refrigerant Flow) created by Daikin in 1987 is a thermodynamic system direct relaxation every season. This system exists either in cooling or for cooling and heating, so it is called \"reversible system\" or more commonly heat pump. The VRV technology has evolved over the past 25 years to achieve results unthinkable five years ago. This system based on the compression and expansion of a gas is currently equipped with INVERTER compressor that is variable variable speed and consequently to flow thereby adapt in real time the speed of the compressor to the required power and thus control the energy absorbed. In respect of the environment and in accordance with the Kyoto Protocol, the VRF AIRWELL from 2003 use R410A refrigerant, which represents considerable progress both in ecological level and improvement of COP (coefficient of performance). The globally recognized VRF system is increasingly prescribed in the specification for the heating and cooling of office complexes from 100 m?, laboratories, and all premises where the temperature should be controlled.