VRF (Variable Refrigerant Flow) innovative climate control technologies that allow for changes in temperature in different parts of a building at different times of day. The user simply sets the ambient temperature required and the system will maintain the room at that temperature no matter what happens outside or in the next room. Coping with External Temperature Variations Early in the morning, no matter what the time of year, the north facing rooms of a building are likely to be quite chilly, whilst those on the south side will feel a bit warmer. As the sun rises, the temperature inside the building will rise more quickly on the elevations facing the sun. Consequently, those rooms which do not benefit from this solar gain continue to maintain a requirement for heating at the same time that those south facing rooms need cooling. With conventional air conditioning systems the occupiers of the building would be unable to enjoy simultaneous heating and cooling.