Variable Refrigerant Flow (VRF) is everywhere these days. If you work in HVAC, you can’t escape it. The brochures promise efficiency, flexibility, and comfort – sometimes they sound like VRF can solve ...

Variable refrigerant flow (VRF) systems were first introduced to the HVAC community in Japan in 1980 as a highly efficient heating and cooling option in multi-zone comfort applications. It took the ...