Monthly Archives: September 2025

What is a Manual J (VRF Load Calculation Report)? Variable Refrigerant Flow (VRF) systems provide exceptional comfort and efficiency by modulating refrigerant flow to multiple indoor units, allowing precise zoning and even simultaneous heating and cooling. However, the performance of a VRF system is only as good as the design that underpins it. At the [...]

Variable Refrigerant Flow (VRF) Systems Overview VRF systems use a centralized outdoor condensing unit (or a bank of them) that varies refrigerant flow to multiple indoor units so each room/zone gets exactly the capacity it needs. That allows simultaneous heating and cooling of different zones, fine temperature control, and strong part-load efficiency compared with a [...]