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Commercial rooftop units

Packaged rooftop units heat, cool and ventilate a large share of low-rise commercial space. Find sourced manufacturers and the roles that select, install, start up and service them.

Equipment scope

Rooftop units package compressors, coils, fans, heating sections and controls in one cabinet, typically on a curb above the space served. Options include gas heat, electric heat or heat pump operation, economizers, energy recovery and DDC integration. Tonnage, efficiency ratings and options vary by model line; a manufacturer listed here does not offer every configuration.

Rooftop units 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

AAON

Commercial HVAC products include rooftop units, air handlers, heat pumps, self-contained systems, and controls.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

Carrier

Commercial HVAC equipment, including AquaEdge water-cooled chillers and building-system controls.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

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.

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.

Rheem Commercial

Commercial air conditioners, heat pumps, split systems, air handlers, and water heating equipment.

Official product source

Official careers · Checked 2026-10-22

Applications are handled by the company, not Gulfstream.

Trane

Commercial air-cooled and water-cooled chillers, other HVAC equipment, building controls and equipment services.

Official product source

Official careers · Checked 2026-10-22

Parent-company careers at Trane Technologies; filter for the relevant brand, role and US location.

YORK (Johnson Controls)

Johnson Controls equipment brand offering air-cooled and water-cooled commercial chillers; brand and parent-company career listings may overlap.

Official product source

Official careers · Checked 2026-10-22

Parent-company careers at Johnson Controls; confirm the YORK brand, employer and US location for each role.

Rooftop units career paths

Example paths, not guaranteed promotions or current openings.

Service and maintenance

Diagnose refrigeration circuits, gas heat sections, economizers, belts and controls; EPA 608 certification is required for refrigerant work. Follow fall-protection and lockout procedures on roofs.

Service apprentice → RTU service technician → lead technician or service manager

Service division roles

Startup and controls

Verify airflow, refrigerant charge, safeties, economizer operation and BAS points at commissioning. Factory startup and contractor startup scopes differ by job.

Startup technician → controls or commissioning specialist → commissioning lead

Controls and commissioning careers

Applications and sales

Select units by load, airflow, ventilation and electrical service; coordinate curbs, adapters, crane picks and lead times for replacements and new work.

Inside sales → sales engineer → territory or 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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