VRF is a large scale ductless HVAC system that can perform at a high capacity. It typically consist of 3 or more indoor units and single outdoor unit. Indoor unit is available in specified volume(tons) and outdoor unit is available in Horse power. VRF system is energy efficient because the variable speed compressor runs only at the capacity needed for the current conditions. These systems have Inverter compressors that allow lowering power consumption with partial cooling/heating loads and have the ability of modular expansion (especially applicable for large projects, that can grow in stages).