What is VRF systemin construction?

A heat pump VRF system puts every connected zone in the same mode, all heating or all cooling at once, which suits open plans with uniform loads. A heat recovery system adds branch controllers (some manufacturers use branch selector boxes and an extra pipe) so one zone can reject heat that another zone absorbs, heating and cooling simultaneously. Heat recovery costs more in equipment and piping, and the branch controllers are the component estimators most often miss.

Far less than a conventional system, which is much of its appeal in renovations. Wall mounted and cassette indoor units need no duct at all, while ducted indoor units serve short local runs rather than a building-wide trunk system. The project still needs outside air from a dedicated outdoor air system on most commercial work, plus condensate drains at every indoor unit, so the sheet metal scope shrinks but never reaches zero.

Branch controllers on heat recovery jobs, condensate pumps at indoor units that cannot gravity drain, the zone and central controls package, and the refrigerant charge calculation, which on a large system is a real cost line of its own. Manufacturer required startup and commissioning by certified technicians also carries hours a conventional split system bid would not. Pipe sizes change at every branch, so a single average lf price needs a sanity check against the piping diagram.