HVAC industry size and outlook for contractors

Why HVAC market numbers are messy

Ask how big the HVAC industry is and you will find numbers that disagree by billions. Most private market reports estimate equipment sales, global revenue or broad building services, and their methods are not public. Government data is narrower but transparent: it counts establishments, employees, payroll and occupations. For a contractor planning hiring, pricing and territory, the government numbers are the more useful starting point.

One quirk matters. The North American Industry Classification System puts HVAC contractors in industry 238220, the same code as plumbing contractors^[5]. Every Census count below therefore includes plumbing firms. Occupation data from BLS is cleaner, because it counts HVAC mechanics and installers as a job wherever they work.

The industry in numbers

Two things stand out. First, this is an industry of small companies: more than three in four establishments have fewer than ten employees, and solo operators outnumber employer firms. Competition in most markets is fragmented, which means local reputation, call handling and service agreements decide share more than national brands do. Second, payroll is substantial: the average payroll per employee of $73,693^[1] includes technicians, installers, office staff and managers, and total industry payroll was $89.5 billion.

How HVAC compares with neighboring trades

HVAC sits alongside electrical contracting as one of the two largest residential trades by employment. Electrical contractors counted 83,342 establishments with 1,015,983 employees in 2023^[1], fewer firms than plumbing and HVAC but a similar workforce. The two trades also share a pattern: more than half of establishments have fewer than five employees, and both rely on licensed technicians who take years to train.

The differences matter for planning. HVAC demand is more seasonal and weather-driven, it carries a large replacement market for equipment with a finite life, and it has a strong maintenance-agreement model. That combination makes HVAC companies more sensitive to peak-season call handling and to the size of their agreement base than most other trades. A contractor that knows its agreement count, its peak-week answer rate and its technician headcount knows most of what the industry numbers can tell it.

The workforce outlook

Employment of HVAC mechanics and installers is projected to grow 11% from 2025 to 2035, much faster than average, with about 40,600 openings a year^[3]. Most of those openings replace workers who retire or leave. For contractors, that means hiring remains the main constraint on growth: you can usually find more work before you can find more qualified technicians.

The office matters too. Building equipment contractors, the wider group that includes HVAC, plumbing and electrical firms, employed 14,490 dispatchers and 21,580 customer service representatives in May 2025^[7][8]. Those roles decide how many calls turn into booked work, and they are hard to staff for evenings, weekends and peak-season surges.

Where the companies are

California had the most plumbing, heating and AC contractor establishments in 2023, 11,686 or 10.5% of the national total, followed by Florida with 9,353 and Texas with 8,966^[9]. Large counts mean more competitors, but also larger markets. The useful local number is households per contractor, which you can calculate for your own counties from Census County Business Patterns and housing data.

What drives demand

• Air conditioning is nearly universal: 88% of US households use it, and two-thirds use central AC or a central heat pump as their main equipment^[4]. AC use is highest in the South at 93% and the Midwest at 92%, and lowest in the West at 73%^[4].
• Heating and cooling are the largest home energy uses, 52% of household energy consumption in 2020^[10], which keeps efficiency upgrades and maintenance relevant.
• Refrigerant rules are changing equipment: EPA's Technology Transitions rule set a 700 GWP limit for refrigerants in new residential and light commercial AC and heat pump systems from January 1, 2025^[11]. Expect questions about refrigerant availability and repair-or-replace decisions on older systems.
• Incentives have shifted: the federal 25C credit covers qualifying property placed in service before December 31, 2025 only^[12]. Update sales material that still promises the credit.
• Installation quality matters: improper installation can reduce HVAC efficiency by up to 30%^[13]. Commissioning and documented installs are a selling point, not just a cost.

What the numbers mean for your plan

• Hiring is the growth limit. With technician demand projected to grow much faster than average, your recruiting, training and retention plan matters more than your marketing plan. Budget for apprentices and for the senior technicians who train them.
• Competition is local and fragmented. In a market made mostly of small firms, being the company that answers, arrives on time and follows up wins share without outspending anyone.
• Peak-season capacity decides the year. Heat waves and cold snaps compress demand into a few weeks; companies that can answer and triage every call in those weeks take customers who stay for years.
• Replacement demand is changing. Refrigerant rules and the end of the 25C credit change how you present repair-or-replace options. Train salespeople on the current rules rather than last year's talking points.
• Wages keep rising. Payroll per employee in the industry is already high, so price books and agreement prices need a yearly review tied to your own labor cost.

Seasonal swings and office capacity

HVAC demand follows the weather. BLS notes that technicians may be on call for emergencies and work overtime or irregular schedules in peak heating and cooling seasons^[3]. The same is true of the office. A company that books comfortably in April can miss a large share of calls in the first week of a heat wave, when everyone with a failed system calls at once.

Plan peak capacity explicitly: how many calls the office can answer per hour, how many technician slots exist per day, and what happens when both are full. A clear triage script (no cooling with a vulnerable occupant first, comfort calls next, maintenance rescheduled), a callback list and overflow call coverage protect revenue and reputation in the weeks that matter most.

Limits of the data

Government data lags. County Business Patterns figures for 2023 were the latest full count in late 2026, and occupational projections are estimates. Establishment counts also include commercial and industrial contractors that never compete for residential work. Use the numbers to understand direction and scale, then check them against what you see locally: competitor listings, job ads and your own call volume.

Sizing your own market in an afternoon

1. 01

   List your counties or ZIP codes

   Start with where you actually run trucks, not where you would like to.

2. 02

   Count households and owner-occupied homes

   Use the American Community Survey tables on data.census.gov for households, tenure and year built.

3. 03

   Count competitors

   County Business Patterns gives establishment counts for industry 238220 by county. Remember it includes plumbers; maps listings help separate them.

4. 04

   Estimate system counts

   Apply the regional AC use rates from EIA to your households for a rough count of cooling systems, and add heating systems.

5. 05

   Compare with your customer base

   Divide your active customers and service agreements by the system estimate. That share, and how it changes yearly, is your real market position.

Example: a fictional contractor serves three counties with about 180,000 households and estimates roughly 160,000 cooling systems. It has 4,800 active customers and 1,900 maintenance agreements, so it serves about 3% of systems and holds agreements on about 1%. The plan that follows is not about market size at all; it is about converting more one-time customers into agreements in the area it already covers.

For the wider picture across trades, see the home services market overview, and for what an older housing stock means for replacement demand, read aging housing stock and repair demand.