A commercial HVAC technician installs, services, and repairs the heating and cooling equipment inside non-residential buildings — rooftop units, chillers, boilers, variable refrigerant flow systems, and the controls that tie them together — for customers such as offices, hospitals, schools, and data centers.
Most work for mechanical and HVAC contractors rather than one building owner.
This guide covers the equipment, the building types, the service and construction sides, unions, pay, and the routes in.
What equipment commercial HVAC technicians work on
Commercial buildings concentrate their heating and cooling into larger, more specialized equipment than a house ever carries.
The machines that define commercial HVAC work include:
- Packaged rooftop units (RTUs) — the self-contained heating and cooling units that sit on the roofs of stores, warehouses, and office buildings, and that make up so much of the low-rise commercial landscape.
- Chillers — central cooling plants that chill water for distribution around large buildings; on the refrigerant side, the low-pressure chiller class is its own category under the EPA's certification rules.
- Boilers and hydronic systems — the hot-water and steam side of commercial heating, paired with pumps, air handlers, and terminal units.
- Variable refrigerant flow (VRF) systems — refrigerant-based systems that condition many zones from one outdoor plant, common in offices, hotels, and schools.
- Building automation and controls — the control systems that schedule and modulate all of the above; deep controls work is its own specialization with its own role, the controls technician.
The refrigerant side of this equipment is regulated federally.
Under the EPA's rule at 40 CFR 82.161, a technician who could reasonably be expected to violate the integrity of a refrigerant circuit while maintaining, servicing, or repairing appliances containing regulated refrigerants must pass an exam from an EPA-approved certification program — and the certification types map to the equipment: Type II covers medium-, high-, and very-high-pressure appliances, while Type III covers low-pressure appliances, the class EPA says includes chillers using refrigerants such as R-11, R-123, R-113, or R-245fa.
That split says a lot about the trade: the larger and more central the equipment, the more of the job is about keeping a whole building's system balanced, not just one room comfortable.
Types of buildings and customers
The customer list is what separates commercial work from residential service.
Instead of homeowners, the people on the other side of the work order are facility and property managers, building engineers, owners' representatives, and — on construction projects — general contractors coordinating the mechanical scope with every other trade on the site.
The buildings themselves range across offices, hospitals and healthcare facilities, schools and universities, retail and restaurants, hotels, data centers, and industrial plants.
Each building type brings its own operating stakes: a hospital's surgical suites and a data center's server floors cannot drift out of temperature the way a living room can, which is part of why maintenance on commercial equipment is often planned under standing service agreements rather than waiting for a breakdown.
The demand side is real.
BLS expects commercial construction — data centers included — and residential construction to drive HVAC employment growth, along with increasingly sophisticated climate-control systems and retrofit and replacement work.
Most of these jobs sit with contractors, not with single buildings.
In May 2025, Building Equipment Contractors — the NAICS industry group that includes plumbing, heating, and air-conditioning contractors — employed 305,330 HVACR mechanics and installers, by far the largest industry for the occupation.
In 2025 overall, 68% of HVAC mechanic and installer jobs were with plumbing, heating, and air-conditioning contractors, and 6% of workers were self-employed, per BLS.
Service side vs construction side
Commercial HVAC splits into two kinds of work, and most technicians end up leaning toward one.
The service side maintains and repairs equipment in existing buildings: scheduled maintenance under service agreements, diagnostics when something drifts or fails, repairs and part replacements, and emergency calls.
BLS describes the HVAC trade's schedule here — most technicians work full time, schedules may include evenings or weekends, they may be on call for emergencies, and peak heating and cooling seasons can bring overtime or irregular hours.
Service work rewards diagnostics and customer relationships: the technician who understands a building's systems becomes the person that facility manager calls first.
The construction side installs new systems — in buildings going up and in retrofits of old ones.
The work follows plans and specifications, runs on project schedules, and is coordinated with sheet metal, electrical, plumbing, and other trades.
Construction techs see a system from rough-in to commissioning; service techs live with it for the decade after.
Neither side is a different licence or a different trade — it is the same equipment knowledge applied on different rhythms, and the trade's core credential, the EPA certification, is the same on both.
Union vs non-union commercial work
Union membership runs above the national rate in the occupation groups behind commercial construction, and the federal numbers frame it: in 2025, 10.0% of U.S. wage-and-salary workers were union members, per BLS.
Among workers in construction and extraction occupations, 16.4% were members and 17.4% were represented by a union; in installation, maintenance, and repair occupations — the group that contains HVAC mechanics — 12.5% were members and 13.6% were represented.
Within the construction industry itself, 11.1% were members (12.0% represented).
BLS publishes these rates only for broad occupation groups, not for HVAC technicians specifically, and no controlled "union premium" figure for the trade exists.
The earnings comparison BLS does publish is a raw one, for those broad groups: in 2025, full-time union members in construction and extraction occupations had median weekly earnings of $1,561 versus $1,004 for non-union workers in the same group; in installation, maintenance, and repair occupations, $1,571 versus $1,140.
Treat those as descriptive, not causal — the gap is not adjusted for occupation mix, region, age, or experience.
On the union side of commercial work, the United Association (UA) represents approximately 409,000 plumbers, pipefitters, sprinkler fitters, HVACR service technicians, welders, and related trades across North America, and it lists HVACR service technicians among its trades.
UA apprenticeships are registered with the U.S. Department of Labor and include 2,000 hours of paid on-the-job training a year plus 216 hours of related classroom instruction.
Non-union ("merit shop") contractors are the rest of that picture: with 16.4% union membership in construction and extraction occupations and 12.5% in installation, maintenance, and repair, most workers in the occupation groups behind commercial work are not union members.
Dues, lists, and local rules vary by union local, so ask the specific local or contractor rather than generalizing.
How commercial HVAC differs from residential work
Residential and commercial techs share a trade — the same refrigeration cycle, the same EPA certification rule — but the day looks different on each side of the line.
Residential work centers on split systems and furnaces in occupied homes, with the homeowner as the customer; commercial work centers on the larger packaged and central equipment above, with facility managers and contractors as the customers and maintenance agreements as the recurring business.
One difference gets overstated online: pay.
BLS publishes no separate wage for commercial versus residential HVAC work — OEWS counts SOC 49-9021 as one occupation, and its May 2025 median of $29.33 an hour ($61,010 a year) covers all HVACR mechanics and installers, both sides of the market.
Any page quoting a "commercial HVAC median" against a "residential median" is splitting a number BLS does not split.
Residential service is its own track with its own equipment, sales rhythm, and career ladder — the HVAC technician guide covers it end to end.
How to get into commercial HVAC
There is no commercial-only entrance exam; you enter the trade and steer toward commercial work as you build equipment experience.
BLS says HVAC technicians typically need a postsecondary nondegree award — programs of 6 months to 2 years — followed by lengthy on-the-job training, and that some train through multi-year apprenticeships instead.
The union route is one version of that: UA apprenticeships are registered with the U.S. Department of Labor and combine 2,000 hours of paid on-the-job training a year with 216 hours of related classroom instruction.
The credential that matters from day one is federal, not commercial-specific.
Under the EPA's rule at 40 CFR 82.161, any technician who could reasonably be expected to violate the integrity of a refrigerant circuit while maintaining, servicing, repairing, or disposing of appliances containing regulated refrigerants must pass an exam from an EPA-approved technician certification program.
Which certification type you hold shapes which equipment you can work on: Type II covers medium-, high-, and very-high-pressure appliances, and Type III covers the low-pressure class that includes chillers — so a tech moving toward central plant work adds Type III to the card.
A common path looks like this: complete a trade school program or start as a helper, earn the EPA certification the refrigerant work requires, then learn the commercial equipment on the job through a contractor or a registered apprenticeship.
Depth on specific equipment — chillers, boilers, VRF, controls — is what steers a technician toward the commercial side of the trade.
Certification and licensing rules change — verify before you commit
Find commercial HVAC jobs
The outlook behind the job search is strong.
BLS projects employment of HVAC mechanics and installers to grow 10.9% from 2025 to 2035 — against a 3.5% average for all occupations — with 40,600 openings a year on average, and it names commercial construction, data centers included, among the drivers.
The employers are the mechanical and HVAC contractors described above, concentrated wherever commercial construction is active.
What employers look for follows from the work: a current EPA certification, demonstrated experience on the equipment you claim — rooftop units, chillers, boilers, VRF, or controls — and, for many roles, the willingness to carry on-call time.
Pay varies by market and specialization; for the percentile tables, see the commercial HVAC technician salary page.
Ready to look?
Browse open commercial HVAC technician jobs — listings are grouped by role, so you see only the positions built for this trade.
Career information, not legal advice.