We are full mechanical air company HVAC installation.
We do design build and full installation. Mechanical piping, steam hot water, chill water, refrigeration piping.
We can use the brand that customer want. We usually do: Plans and stage what engineer specify we will provide exact brand was engineer specify.

Variable refrigerant flow (VRF) system:

Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982.[1] Like ductless minisplits, VRFs use refrigerant as the cooling and heating medium. This refrigerant is conditioned by a single outdoor condensing unit, and is circulated within the building to multiple indoor units.