VRF (Variable Refrigerant Flow) air conditioning is the standard solution for commercial buildings requiring climate control across many zones. If you own or manage a commercial property in Surrey, Sussex or South London, you have almost certainly encountered VRF systems — here is a clear explanation of what they are and whether one is right for your premises.
What VRF Air Conditioning Is
A VRF system uses one or two large outdoor units connected to many indoor units — potentially 10-50+ indoor units in different rooms — all via a single refrigerant piping network. Each indoor unit is independently controllable. The outdoor unit continuously varies its compressor speed to match the total demand from all active indoor units — hence “variable refrigerant flow.”
The key difference from a multi-split system (which also has one outdoor unit and multiple indoor units) is scale and sophistication. A domestic multi-split serves 2-5 indoor units. A commercial VRF system can serve 50+ indoor units from a single large outdoor unit or pair of outdoor units, with sophisticated controls and energy monitoring.
VRF vs Multi-Split — When to Use Each
Multi-split (up to 5 indoor units): Smaller offices, shops, clinics and other commercial premises requiring climate control in up to 5 rooms. Lower capital cost, simpler installation and controls. Sufficient for most small commercial premises.
VRF (5+ indoor units, typically 8+): Larger offices, hotels, retail premises, school buildings and commercial properties requiring climate control across many zones. Higher capital cost but significantly more efficient at scale, better individual zone control, and more sophisticated energy management.
Heat Recovery VRF
Standard VRF systems (heat pump systems) can either cool all zones or heat all zones simultaneously but cannot do both at the same time. Heat recovery VRF systems — also called 3-pipe systems — can simultaneously cool some zones while heating others. The heat extracted from cooled zones is transferred to heated zones rather than being rejected outside — achieving very high system efficiency. For buildings with mixed cooling and heating requirements throughout the year (a hotel lobby that needs heating while south-facing rooms need cooling), heat recovery VRF is significantly more efficient than a standard heat pump VRF.
Main VRF Brands
Mitsubishi Electric City Multi: The most widely specified VRF system in the UK. Excellent reliability record, good parts availability, strong technical support.
Daikin VRV: Close competitor to Mitsubishi. Daikin coined the term VRV (Variable Refrigerant Volume) and the technologies are equivalent. Also widely specified and supported.
Samsung DVM: Good quality VRF at competitive pricing. Growing market share in UK commercial. Less established service network than Mitsubishi and Daikin.
LG Multi V: Credible option for cost-sensitive commercial projects. See our commercial guide for further details.
Cost
A VRF system for a medium-sized office building (10-20 indoor units): £18,000-40,000. Larger installations are quoted individually. Call 07833 053749 or contact us for a commercial consultation.