Air Conditioning VRF & VRV

VRF (Variable Refrigerant Flow) and VRV (Variable Refrigerant Volume) are 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.

With VRF/VRV technology, however, the desired temperature is set on the user control panel and the system will constantly adapt and change with the external conditions to maintain that temperature without further user interference. It does this by ensuring that the air introduced into the room is cooled or heated to the correct temperature with the degree of cooling or heating automatically adjusted. The temperature of air introduced to different rooms will differ according to the conditions in that location.

Differing User Requirements

The occupiers of different rooms within a building may prefer their rooms a bit warmer or cooler than others. With VRF/VRV, the ambient temperature of each room can be individually set and the system will automatically deliver air to each room heated or cooled to meet the temperature requirement, no matter what temperature users of other rooms require.

VRV/VRF (variable refrigerant volume/flow)

More 'intelligent' than the standard split air conditioning systems, the VRV/VRF (variable refrigerant volume/flow) system allows the operation of up to 16 o. indoor fan coil units to be operated from a single external condensing unit. With obvious advantages of space saving and significant cost savings on installation, this air conditioning system type is now more popular than before in large high rise multi office type buildings or any building where plant space is at a premium.

With large refrigerant pipe runs of up to 100m and level differences of up to 50m, buildings 15 storeys high can be served from roof mounted condensing units. Extensions of the VRV/VRF concept allow for simultaneous heating or cooling from individual coil units served from the same condensing unit. Heat recovery within the system makes effect of waste heat therefore, ensuring maximum energy efficiency.

Fully optimized air conditioning systems to operate on both R22 refrigerant and R407c, a non-toxic, zero ozone depleting refrigerant.


Following installation, Cool Runnings provide a full commissioning service to comply with all manufacturers recommendations including the provision of operations and maintenance manuals and as fitted drawings.

After Sales Service

Cool Runnings also offer a dedicated after sales service. When a system as technical as air conditioning has been installed we make sure that you also receive the best in maintenance and emergency support, a pre-planned preventative maintenance programme is essential to ensure maximum efficiency and to avoid costly and inconvenient breakdowns. Where required we can offer 24hr breakdown cover.


Subject to a regular maintenance contract being taken, all our installations carry comprehensive parts warranty period for 3 years.


All Cool Runnings engineers are subject to ongoing technical training and improvements. The company operate and ongoing apprentice training program to ensure a consistency of approach and quality for all our customers. Project managers are also subject to training in ever changing legislation with technical advances, a policy which guarantees their ability to supply the best and most up-to-date solutions for any requirement, including office air conditioning and industrial air conditioning systems.