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Variable refrigerant flow (VRF) systems

Outdoor units vary compressor speed and refrigerant flow to many indoor units over one refrigerant network. Heat-recovery systems can move heat from zones in cooling to zones in heating.

Equipment scope

Heat-pump VRF serves all connected zones in one mode at a time; heat-recovery VRF uses branch or mode-change devices so zones can heat and cool simultaneously. Indoor units can be ducted, ceiling cassette, wall-mounted or floor units. Ventilation is normally separate, often a DOAS. Design limits include connected-capacity ratio, piping length and elevation, refrigerant charge relative to occupied room volume under the adopted code, and low-ambient heating capacity. Each manufacturer's system is proprietary, so controls, branch devices and piping rules do not transfer between brands.

VRF guides by brand

  • LG VRF (Multi V)
  • Mitsubishi Electric VRF (CITY MULTI)
  • Daikin VRF (VRV)
  • Samsung VRF (DVM S2)
  • Fujitsu VRF (AIRSTAGE)
  • Panasonic VRF (ECOi)
  • Midea VRF (Midea VRF)
  • Lennox VRF (Lennox VRF)

VRF company directory

Independent public reference directory, not a Gulfstream client list. Listings do not imply affiliation, endorsement or current hiring. US research is expanding in verified batches; this is not a complete census. Territories vary by product line; confirm coverage with the company.

Manufacturers design, build and test equipment. Distributors supply equipment, quotations, parts and order support. Manufacturer reps support selections, specifications and represented product lines; some also distribute. Categories overlap only where supported by official sources.

Manufacturers

Daikin Applied

Commercial and industrial HVAC equipment including chillers, air handlers, rooftop systems and VRV (variable refrigerant volume, a VRF technology) solutions. Product brands and sales channels vary.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

Fujitsu General

Commercial AIRSTAGE variable refrigerant flow (VRF) systems and associated controls.

Official product source

No dedicated official careers page verified. No opening is implied.

Lennox Commercial

Commercial HVAC equipment and controls, including rooftop units, unit heaters, and variable refrigerant flow systems.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

LG Air Conditioning Technologies

Commercial Multi V variable refrigerant flow (VRF) systems and MultiSITE controls.

Official product source

Official careers · Checked 2026-10-22

LG Electronics North America careers; filter for HVAC roles and US locations.

Midea Building Technologies

Building HVAC equipment including variable refrigerant flow (VRF) systems. Confirm US product availability through the official company channels.

Official product source

No dedicated official careers page verified. No opening is implied.

Mitsubishi Electric Trane HVAC US

Commercial CITY MULTI variable refrigerant flow (VRF) systems and air-to-water systems for building climate control.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

Panasonic HVAC

Commercial HVAC solutions including ECOi variable refrigerant flow (VRF) systems, controls and accessories.

Official product source

Official careers · Checked 2026-10-22

Panasonic North America careers; filter for HVAC roles and US locations.

Samsung HVAC

Commercial DVM S2 variable refrigerant flow (VRF) systems, including heat-pump and heat-recovery configurations.

Official product source

Official careers · Checked 2026-10-22

Samsung US careers; filter for HVAC roles and US locations.

Distributors

Norman S. Wright Mechanical Equipment

Commercial HVAC equipment distributor with sales and application engineering support. Products include air distribution and cleaning, fans, filtration, dampers, louvers, chilled beams, heating systems, laboratory controls, VFDs, VRV systems, chillers, cooling towers, air handlers, energy recovery, DOAS and rooftop units. Hydronic offerings include boilers, pumps, heat pumps and plant specialties; the product overview does not identify specific brands.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

Sigler

Distributor of Carrier equipment. Commercial offerings include applied equipment, ductless and conventional split systems, rooftop and indoor package units, VRF, commercial controls and indoor air quality products.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

VRF career paths

Example paths, not guaranteed promotions or current openings.

Installation and refrigerant piping

Install outdoor and indoor units, braze and pressure-test refrigerant piping, evacuate and charge to the manufacturer's procedures. EPA 608 certification is required to handle refrigerant; manufacturer installation training is often required for warranty.

Apprentice → journeyman HVAC/pipefitter → VRF lead installer → foreman

Construction and TI roles

Startup, commissioning and service

Run manufacturer startup and test-run procedures, address units and controls, and diagnose using service tools and error codes. Brand-specific factory training is common.

Service technician → VRF specialist → service manager

Service division roles

Design, selection and sales

Produce manufacturer selection-software layouts and piping diagrams, check refrigerant concentration limits and coordinate submittals. Licensed system design remains the engineer of record's responsibility.

Applications support → VRF design/applications engineer → sales engineer → sales leadership

Rep and applications careers

Gulfstream recruits for commercial mechanical contractors. Company careers links are independent resources, not Gulfstream job listings or partnerships.

Equipment hub · Careers hub · Apply with Gulfstream

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