HVAC technicians
Official title Heating, Air Conditioning, and Refrigeration Mechanics and Installers (SOC 49-9021)
Also called HVAC mechanic, HVAC installer, HVACR technician, Refrigeration mechanic, Refrigeration technician
In brief
In May 2025, BLS counted 409,670 US HVAC technicians, with median pay of $61,010 a year. Of the BLS counts since 2012, the May 2025 count is the highest. The earliest figure here is an estimate of 25,000 from 1930, not measured the same way as today's count. The last full technology era for HVAC technicians: R-410A era + inverter-driven mini-splits + smart thermostats, 2010 to 2022.
What the sources say
Official outlook
BLS projects employment to grow 10.9% from 2025 to 2035.
AI exposure studies
- 14% of this job's tasks are exposed to large language models. Not a forecast of job losses. Eloundou and others, 2023
- 0.65 estimated probability that the whole occupation could be computerised, over an unspecified number of years. Not a forecast of job losses. Frey and Osborne, 2013
Since the 2013 prediction
In 2013, Frey and Osborne put this job's probability of computerisation at 0.65. BLS counted 251,700 of these jobs in May 2013 and 409,670 in May 2025 (+63%, a change derived by Future History).
Data as of BLS OEWS May 2025; BLS Employment Projections 2025-35. BLS publishes these counts as yearly survey snapshots and cautions against reading them as a precise trend. In May 2021 BLS changed how it estimates these counts (a model-based method using three years of survey data) and moved fully to the 2018 occupation codes, so part of a change across 2021 can come from the method rather than the work.
Last updated .
Cite this page
Future History. (2026, October 11). HVAC technicians: jobs and pay since 1930 [Data set; data as of BLS OEWS May 2025; BLS Employment Projections 2025-35]. https://futurehistory.earth/timeline/49-9021
Future History. "HVAC technicians: jobs and pay since 1930." Data as of BLS OEWS May 2025; BLS Employment Projections 2025-35. Last modified October 11, 2026. https://futurehistory.earth/timeline/49-9021.
@misc{futurehistory_49_9021, author = {{Future History}}, title = {HVAC technicians: jobs and pay since 1930}, year = {2026}, month = oct, howpublished = {\url{https://futurehistory.earth/timeline/49-9021}}, note = {Last updated 2026-10-11. Data as of BLS OEWS May 2025; BLS Employment Projections 2025-35}, }
The access date is today's date on your device.
≈ $59,446 in 2024 prices (derived by us, CPI-adjusted)
On July 17, 1902, Willis Carrier submits drawings for the first modern air conditioning system, installed at the Sackett-Wilhelms Lithographing and Publishing Company in Brooklyn. The system controls humidity to prevent paper from warping during four-color printing: it is not a comfort system, it is a precision process-control system. The person who maintains it is a refrigeration engineer, drawing on skills developed in the commercial ice and meatpacking refrigeration trades. Carrier's 1911 paper "Rational Psychrometric Formulae" gives the new field its mathematical foundation; his 1915 co-founding of Carrier Engineering Corporation creates the first dedicated air conditioning manufacturer.
Carrier Engineering Corporation installs the first centrifugal chiller at the Rivoli Theater in New York: a mechanical design that uses a high-speed impeller rather than a reciprocating piston, enabling far larger cooling capacity than anything previously built. The centrifugal chiller makes large commercial air conditioning economical for the first time. The Rivoli installation is the public debut of air conditioning as a consumer amenity: the theater advertises "cool air" as a selling point, and the practice of going to an air-conditioned movie theater to escape summer heat becomes a fixture of American urban life for the next several decades.
Engineer Henry Galson develops a compact, affordable window air conditioning unit design. 43,000 units sell in 1947: the first year window air conditioning is available at a price accessible to middle-class homeowners. For HVAC mechanics, the window unit creates the residential service call as a routine job type: a homeowner, a broken unit, a technician dispatched to diagnose it. The skills are the same as commercial refrigeration work in miniature, but the customer relationship is entirely different from commercial accounts.
The Air Conditioning Contractors of America (ACCA) is founded, representing the growing industry of independent HVAC contractors. ACCA's most consequential technical contribution is Manual J: the residential load calculation standard that specifies how to size an HVAC system for a given house based on insulation, window area, orientation, climate, and occupancy. Proper Manual J calculation prevents the industry's most common installation mistake: oversizing, which causes short cycling, poor dehumidification, and equipment that wears out faster than it should. Manual J is the profession's first engineering standard for residential work, and its adoption separates quality contractors from those who "size by rule of thumb."
The Montreal Protocol is agreed on September 16, 1987, and enters into force January 1, 1989. For HVAC mechanics, the Protocol's phaseout of chlorofluorocarbon (CFC) refrigerants, R-12 (Freon) by 1996 in developed nations, is the first major forced technology transition in the occupation's history. Every technician trained on R-12 systems must learn the HFC replacements. The R-22 HCFC refrigerant used in residential central air conditioning gets a longer timeline under the Protocol (100% reduction by 2020 for developed nations), but the direction is clear: the refrigerants the trade has used for 50 years are going away, and new training is not optional.
EPA Section 608 refrigerant certification takes effect: the first federal credential required of HVAC technicians. Section 608, authorized by the Clean Air Act Amendments of 1990, makes it illegal to knowingly vent refrigerants while servicing, maintaining, repairing, or disposing of equipment, and requires that anyone purchasing refrigerant in containers larger than 2 pounds hold an EPA-approved certification. Four certification types are established: Type I (small appliances), Type II (high-pressure systems, covering most residential AC), Type III (low-pressure systems, covering large centrifugal chillers), and Universal (all three). The certification permanently changes the occupation: HVAC mechanics become federally credentialed tradespeople, not just skilled workers.
Two milestones converge in 2022. First: for the first time in US history, heat pump shipments exceed gas furnace shipments, approximately 4 million heat pump units vs. approximately 3.5 million gas furnaces, per AHRI data. Second: the Inflation Reduction Act is signed on August 16, 2022, creating a $2,000 federal tax credit for residential heat pump installations and the HEEHRA rebate program. The IRA accelerates a trend already in motion, driven by rising natural gas prices and improving cold-climate heat pump performance. For HVAC technicians, the heat pump shift requires understanding reverse-cycle refrigeration (cooling in summer, heating in winter with the cycle reversed), variable-speed compressor controls, and supplemental electric resistance backup heat. It is new training on familiar physics.
The EPA AIM Act R-410A phasedown takes effect. R-410A, the refrigerant that replaced R-22 in residential systems and has been the dominant US residential refrigerant since 2010, is itself an HFC with a Global Warming Potential (GWP) of 2,088 times that of CO2. EPA's implementing rules restrict R-410A use in new equipment from 2025, driving manufacturers to new lower-GWP blends: R-32 (GWP 675), R-454B (GWP 466, branded "Puron Advance" by Carrier), and R-454A (GWP 239). Each new refrigerant has different safety classifications, pressure profiles, and handling requirements. An HVAC technician trained on R-410A systems in 2020 needs a third round of refrigerant training by 2025. The occupation is, for the third time in 35 years, mid-transition between refrigerant generations.
Will AI replace HVAC technicians? What the research says
Each figure is stated by the named source; we publish no forecasts of our own. Where sources disagree, we show the disagreement rather than an average.
Each figure is stated by the named source; we publish no forecasts of our own. Where sources disagree, the spread is the honest signal.
What's changing day to day for HVAC technicians
Three parts of your work where AI is already doing real lifting, and what stays yours.
AI is sitting alongside you hereManage daily job schedule via ServiceTitan or similar field-service management platform: review AI-assigned jobs based on skill match and job value, communicate ETAs to customers via automated notifications, and log job completion notes that feed back into the scheduling algorithm for future dispatch recommendations.
Manage daily job schedule via ServiceTitan or similar field-service management platform: review AI-assigned jobs based on skill match and job value, communicate ETAs to customers via automated notifications, and log job completion notes that feed back into the scheduling algorithm for future dispatch recommendations.[4],[11]
Feed the system accurate job notes, time logs, and outcome records -- AI dispatch quality is only as good as the technician data it learns from. High-quality closed-job records make you the algorithm's preferred match for premium jobs.
AI is sitting alongside you hereUse AI technical-manual assistants (Carrier Tell Me More, ServiceTitan Atlas) to query equipment-specific troubleshooting guidance, part replacement specifications, and wiring diagrams in the field
Use AI technical-manual assistants (Carrier Tell Me More, ServiceTitan Atlas) to query equipment-specific troubleshooting guidance, part replacement specifications, and wiring diagrams in the field; cross-reference AI answers against direct sensor readings before executing the repair.[3],[4]
AI manuals access is most valuable on commercial-grade or unfamiliar equipment. Build the habit of querying Tell Me More or Atlas before calling the manufacturer hotline -- reduced time-to-diagnosis is the most direct path to higher completed-jobs-per-day and, with commission structures, higher pay.
AI is sitting alongside you hereDiagnose equipment malfunctions by interpreting AI-generated fault alerts from predictive maintenance platforms (Carrier Abound Predictive Insights, Cimetrics Analytika) alongside direct sensor readings
Diagnose equipment malfunctions by interpreting AI-generated fault alerts from predictive maintenance platforms (Carrier Abound Predictive Insights, Cimetrics Analytika) alongside direct sensor readings; perform root-cause diagnosis on-site and execute the repair.[3],[6],[12]
Treat fault-alert platforms as a force-multiplier: arrive on-site with the AI fault evidence in hand so you spend less time diagnosing and more time repairing. Techs who can configure and interpret these platforms rather than just receive their output earn the BAS-specialist tier wage.
Where HVAC technicians go next
Natural next steps for someone with your foundation: not exits, evolutions.
- Energy Engineers, Except Wind and SolarNo timeline for this role yet
- Industrial Machinery Mechanics
- US median pay
- $64,520 (May 2025)
- BLS outlook 2025-35
- +17.8%
What each move takes
Energy Engineers, Except Wind and Solar
Senior HVAC techs who have built BAS fluency and conducted commercial energy audits already perform core energy engineering tasks. The gap is credentials and calculation methodology: energy engineers run building energy models (EnergyPlus, eQUEST), interpret ASHRAE energy audits, and specify efficiency retrofits at a project scale. A BPI Building Analyst cert + an ASHRAE Level II Energy Audit credential is the practical entry point; a bachelor's in mechanical or building systems engineering is the full transition. Commercial building operators facing tightening ESG mandates are actively promoting experienced HVAC techs into energy analyst roles when the credentials exist.
How has the work of HVAC technicians changed since 1902?
The tools that defined the work, one line per era. Select an era to see how it reshaped the work.
Compressor-coil refrigeration + copper pipe brazing (commercial-only era)
The earliest air conditioning mechanics worked with the same physical equipment that commercial refrigeration mechanics had used for a generation: reciprocating compressors driven by belt from electric motors, copper or steel coils carrying refrigerant (sulfur dioxide, ammonia, or the early CFCs like Freon-12 introduced in 1930), and brazed copper pipe connections. The tools were a torch, brazing rod, pipe benders, a manifold gauge set, and a vacuum pump. Diagnosing a refrigeration system required reading suction and discharge pressures and reasoning backward to the cause: low suction pressure meant either a refrigerant undercharge or a restriction; high discharge pressure meant condenser fouling or an overcharge. There were no certification requirements, no EPA regulations on refrigerant handling, and no training programs beyond apprenticeship under an experienced mechanic.
Effect on the workThe occupation was small and specialized, primarily commercial: meatpacking, breweries, hotels, and theaters. Residential applications were either absent or experimental. Freon-12 (R-12), introduced by Carrier and DuPont in 1930 as a non-toxic, non-flammable CFC refrigerant, made air conditioning safe enough for residential use and set the stage for mass adoption.
Window units + residential split-system emergence (pre-boom)
The 1931 window air conditioner design and Frigidaire's 1929 split-system room cooler opened the residential market conceptually, but price kept mass adoption out of reach. The breakthrough came in 1947 when engineer Henry Galson developed a compact, affordable window unit design; 43,000 units sold that year. For HVAC mechanics, window unit installation and service added a new residential dimension to what had been primarily a commercial trade. Residential service calls (one homeowner, one unit, one technician) required different skills from commercial work: working in attics and crawl spaces, managing homeowner expectations, and carrying the full repair kit in a service van. The split-system central air conditioner (an outdoor condensing unit connected by refrigerant lines to an indoor air handler or coil) was developed commercially in the late 1940s and introduced residentially in the early 1950s, establishing the architecture that dominates the market today.
Post-war suburban central AC boom + service industry formalization
The post-war suburban housing boom created the modern HVAC service industry. By the late 1960s, most new American homes were built with central air conditioning: a transformation driven by the Sunbelt migration, the availability of low-cost residential split systems, and the massive expansion of suburban tract housing. Levittown-style developments wired every house for central air; the Sunbelt cities of Phoenix, Houston, Dallas, and Atlanta would have been uninhabitable at scale without it. For HVAC mechanics, this created the first residential service volume sufficient to sustain a dedicated service truck per technician, a parts warehouse, and a dispatcher. The Air Conditioning Contractors of America (ACCA) was founded in 1969 to represent the industry; ACCA's Manual J residential load calculation standard (systematizing how to size an HVAC system for a given house) emerged in this era as the profession's first engineering standard for residential installation.
Effect on the workEmployment in the air conditioning and refrigeration mechanic category grew rapidly through the 1960s, between 1960 and 1970. The growth was driven almost entirely by the residential installation boom and the service demand it created.
Digital manifold gauges + computerized HVAC controls (first generation)
The energy crisis of 1973-1974 drove the first wave of HVAC efficiency regulation: minimum efficiency standards for central air conditioners, which forced manufacturers to redesign systems and gave technicians a new variable to understand, SEER (Seasonal Energy Efficiency Ratio). Digital manifold gauge sets (replacing analog bourdon-tube gauges) began appearing in the early 1980s, allowing technicians to read suction and discharge pressures with greater precision. Programmable thermostats (the Honeywell Round T87 had been the standard for decades; digital programmable models appeared in the late 1970s and became common in the 1980s) added a control-systems dimension to residential HVAC service. A technician who could only repair mechanical failures now had to understand why a programmable thermostat was not cycling the system correctly.
EPA Section 608 refrigerant certification (1992) + Montreal Protocol phaseouts
The Clean Air Act Amendments of 1990 established EPA Section 608, which required that any technician who purchases or handles refrigerants in HVAC/R service must hold EPA Section 608 certification: four type-based credentials covering small appliances (Type I), high-pressure systems (Type II, covering R-22 and R-410A systems), low-pressure systems (Type III, covering large centrifugal chillers), and a universal certification covering all three. The regulation took effect in 1992 and permanently changed the professional identity of HVAC mechanics: for the first time, it was a federally credentialed trade. Alongside Section 608, the Montreal Protocol's phaseout schedule for CFCs (R-12, by 1996 in developed nations) forced the first major refrigerant transition: every mechanic who had trained on R-12 systems had to learn the new HFC replacements (R-134a for automotive, R-22 continuing for residential HVAC). The R-22 phaseout itself was a decade-long process: new R-22 equipment production was banned by January 1, 2010; new R-22 refrigerant production and import was banned by January 1, 2020. Every R-22 system still in service after 2020 could only be maintained with recovered and recycled refrigerant or repaired by converting to an R-22 alternative.
Effect on the workSection 608 certification created a new entry barrier to the trade and a professional credential that distinguished licensed HVAC technicians from uncertified handymen. The R-22 phaseout created a decade of retrofit and replacement work as the US residential R-22 systems aged out or were replaced voluntarily.
R-410A era + inverter-driven mini-splits + smart thermostats
R-410A became the dominant US residential refrigerant after the R-22 new-equipment ban in 2010: a higher-pressure HFC blend requiring new tools (higher-capacity recovery machines, different manifold gauge sets calibrated to R-410A pressure ranges) and new skills (R-410A systems run at roughly twice the pressure of R-22, requiring more careful handling and different leak-detection techniques). Simultaneously, inverter-driven variable-speed mini-split heat pump systems, common in Japan and Korea since the 1980s, entered the mainstream US market around 2010-2017, offering ductless heating and cooling for retrofits and additions. Mini-splits require a distinct installation skill: running refrigerant lines through wall penetrations, mounting wall-mounted air handlers, and commissioning variable-speed inverter systems. Smart thermostats (Nest Learning Thermostat, 2011; Ecobee, 2012) added Wi-Fi connected controls that could be diagnosed remotely and required technicians to understand cloud-connected HVAC systems.
Effect on the workThe R-410A transition drove training demand across the installed HVAC workforce; the mini-split market grew from a niche to a sizeable share of US HVAC installations by the early 2020s. Smart thermostat proliferation added a new service category: technicians troubleshooting connectivity and compatibility issues rather than purely mechanical failures.
Heat pump electrification wave (IRA 2022) + R-410A AIM Act phasedown (2024)
Two seismic forces converged on the HVAC trade in 2022-2024. First, the Inflation Reduction Act (signed August 16, 2022) created a federal tax credit for residential heat pump installations (under the Energy Efficient Home Improvement Credit, 25C), plus the High Efficiency Electric Home Rebate Act (HEEHRA) program providing point-of-sale rebates for heat pumps in low-and-moderate income households. These incentives drove heat pump sales above gas furnace sales in the US for the first time in 2022, according to AHRI (Air Conditioning, Heating, and Refrigeration Institute) data. Second, the AIM Act (enacted December 2020) authorized EPA to phase down HFC production and consumption; EPA's implementing rules set 2024 as the effective start of the R-410A phasedown, with equipment manufacturers required to shift to lower-GWP refrigerants (R-32, R-454B "Puron Advance," and R-454A) for new equipment. For HVAC technicians, the combined effect means: (a) heat pump installation is now the highest-growth segment of the job, requiring refrigerant cycle knowledge applied in reverse-cycle (heating) mode, electrical knowledge of variable-speed compressors, and familiarity with cold-climate heat pump performance; (b) new refrigerant training is not optional, every technician who works on new equipment must learn the handling properties, safety profiles, and leak-detection methods for the new low-GWP blends.
Effect on the workBLS projects employment growth 2024-2034 (425,200 to 459,700): the BLS Employment Matrix notes demand outstripping the training pipeline. Heat pump installer demand is the single fastest-growing skill segment within the occupation.
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Browse all rolesHeating, Air Conditioning, and Refrigeration Mechanics and Installers employment and pay by year
In other countries
The latest figure each country's statistics agency publishes for this job. Each uses its own occupation definition, survey basis and currency, so the numbers are not directly comparable with each other or with the US figures.
Canada (NOC 72402)
- Employment, 2020
- 29,605, Statistics Canada Census 2021 Official statistic Report an errorStatistics Canada Census of Population 2021: number of persons with employment income in NOC 72402 Heating, refrigeration and air conditioning mechanics, Canada, reference year 2020. A recipients basis (anyone with employment income during the year), slightly broader than a point-in-time employed count. Statistics Canada Open Licence.
- Median pay, 2020
- C$72,500, Statistics Canada Census 2021 Official statistic Report an errorStatistics Canada Census of Population 2021 (Table 98-10-0586): median employment income for NOC 72402 Heating, refrigeration and air conditioning mechanics, Canada, reference year 2020, full-year full-time workers (the basis comparable to the US OEWS full-time median). Statistics Canada Open Licence.
United Kingdom (UK SOC 5225)
- Employment, 2015
- 8,000, ONS ASHE 2015 Official statistic Report an errorONS Annual Survey of Hours and Earnings (Table 14): employee jobs in SOC 5225 Air-conditioning and refrigeration installers and repairers, United Kingdom, 2015 (ASHE "number of jobs", thousands x1000; excludes self-employment). Open Government Licence v3.0.
- Median pay, 2015
- £30,766, ONS ASHE 2015 Official statistic Report an errorONS Annual Survey of Hours and Earnings (Table 14.7a): median gross annual pay for all employee jobs in SOC 5225 Air-conditioning and refrigeration installers and repairers, United Kingdom, 2015. Open Government Licence v3.0.
Australia (ANZSCO 3421)
- Employment, 2025
- 37,600, ABS Labour Force Survey Official statistic Report an errorABS Labour Force Survey (Detailed), table EQ08: employed persons in ANZSCO 3421 Airconditioning and Refrigeration Mechanics, national (summed across sex and state/territory), annual average of 4 quarterly estimates.
- Median pay, 2025
- A$109,200, ABS Employee Earnings May 2025 Official statistic Report an errorAnnualised (x52) from A$2,100 median weekly earnings. ABS Survey of Employee Earnings and Hours, May 2025: median pay for full-time non-managerial employees paid at the adult rate, before tax. Surfaced via the Jobs and Skills Australia occupation profile.
View all 28 years of cited US data, each linked to its source
| Year | US employment | Annual pay (median unless marked) | Source | Report |
|---|---|---|---|---|
| 1930 | 25,000 | n/a | Est., DOE Researched context | Report |
| 1950 | 90,000 | n/a | Est., DOE Researched context | Report |
| 1970 | 190,000 | n/a | Est., DOE Researched context | Report |
| 1980 | n/a | $16,000 | Est., BLS Occupational Outlook Handbook Researched context | Report |
| 2000 | 197,930 | $32,770 | BLS OEWS 2000 Official statistic | Report |
| 2003 | 212,200 | $35,160 | BLS OEWS May 2003 Official statistic | Report |
| 2004 | 225,630 | $36,260 | BLS OEWS May 2004 Official statistic | Report |
| 2005 | 241,380 | $37,040 | BLS OEWS May 2005 Official statistic | Report |
| 2006 | 250,970 | $37,660 | BLS OEWS May 2006 Official statistic | Report |
| 2007 | 262,570 | $38,360 | BLS OEWS May 2007 Official statistic | Report |
| 2008 | 261,610 | $39,680 | BLS OEWS May 2008 Official statistic | Report |
| 2009 | 244,410 | $41,100 | BLS OEWS May 2009 Official statistic | Report |
| 2010 | 224,320 | $42,530 | BLS OEWS May 2010 Official statistic | Report |
| 2011 | 231,160 | $43,380 | BLS OEWS May 2011 Official statistic | Report |
| 2012 | 240,480 | $43,640 | BLS OEWS May 2012 Official statistic | Report |
| 2013 | 251,700 | $43,880 | BLS OEWS May 2013 Official statistic | Report |
| 2014 | 261,390 | $44,630 | BLS OEWS May 2014 Official statistic | Report |
| 2015 | 274,680 | $45,110 | BLS OEWS May 2015 Official statistic | Report |
| 2016 | 294,730 | $45,910 | BLS OEWS May 2016 Official statistic | Report |
| 2017 | 307,060 | $47,080 | BLS OEWS May 2017 Official statistic | Report |
| 2018 | 324,310 | $47,610 | BLS OEWS May 2018 Official statistic | Report |
| 2019 | 342,040 | $48,730 | BLS OEWS May 2019 Official statistic | Report |
| 2020 | 344,020 | $50,590 | BLS OEWS May 2020 Official statistic | Report |
| 2021 | 356,960 | $48,630 | BLS OEWS May 2021 Official statistic | Report |
| 2022 | 374,770 | $51,390 | BLS OEWS May 2022 Official statistic | Report |
| 2023 | 397,450 | $57,300 | BLS OEWS May 2023 Official statistic | Report |
| 2024 | 396,870 | $59,810 | BLS OEWS May 2024 Official statistic | Report |
| 2025 | 409,670 | $61,010 | BLS OEWS May 2025 Official statistic | Report |
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