If you are working out how to grow an HVAC business without simply buying more leads, start with the demand you already touch: the calls that get booked, the estimates that get sold, and the customers who come back.
This page is the growth view of HVAC marketing, and it works the levers that raise revenue before and after a lead arrives, so that the next lead you buy is worth more than the last one.
The field you are growing in
US plumbing, heating and air-conditioning contractors (NAICS 238220) reported $297.6 billion in revenue across 112,088 firms in 2022, according to the Census Bureau's 2022 Economic Census.
Note the scope: that total includes plumbing and commercial mechanical contractors, so treat it as the combined trade, not the residential HVAC market alone.
It is a field of small shops: in 2023 the industry had 111,207 employer establishments, about 58% of them with fewer than 5 employees and about 77% with fewer than 10 (Census County Business Patterns).
Add 178,663 nonemployer businesses with no paid employees, which took in $14.0 billion in 2023, about $78,000 each (Census Nonemployer Statistics).
Combined, that is roughly 290,000 plumbing and HVAC businesses in the US, about 62% of them with no employees (a figure computed by mixing the two Census programs).
One sign of consolidation at the top of the market: on November 12, 2024, Sila Services, a residential HVAC, plumbing and electrical provider operating across the Northeast, Midwest and Mid-Atlantic, announced that Goldman Sachs Alternatives' private equity business would acquire a majority stake from Morgan Stanley Capital Partners, with no financial terms disclosed.
The shape of the field sets the real contest: with about 58% of employer establishments under 5 employees and about 62% of businesses having none at all, the shop up the street is the competitor in front of you, and the ones that win book, close and re-sell better than the ones that merely advertise more.
The six growth levers
Growth in a residential HVAC company comes down to six levers, and only the last one is about buying more demand.
Booked-call rate
The share of callers and form fills that end in a booked appointment; a missed call wastes demand you have already generated.
Estimate close rate
The share of replacement estimates that sell; homeowners who reported an HVAC replacement project spent an average of about $8,400 (Harvard JCHS tabulation of the 2023 American Housing Survey), so each point of close rate is real money.
Maintenance agreements
Recurring visits keep you first in line when aging equipment finally fails, and they are revenue you do not re-buy every month.
Capacity
Techs, trucks and payroll set the ceiling on how much booked work can actually be delivered.
Owned local visibility
Your Google Business Profile, reviews and service pages produce contacts you do not pay for by the piece.
Paid demand
Ads and bought leads multiply the other five; they cannot fix them.
The order matters more than the list: the first five change how many booked and completed jobs a given set of contacts produces, and that is what makes paid demand cheaper per booked job, not the other way around.
The funnel your growth plan acts on
From contacts to installs (illustrative)
At those placeholder rates, 100 contacts become 65 booked appointments and, at a 45% close on estimates, about 29 sold installs.
Growth is arithmetic on this funnel: ten more points of booking and five more points of close turn the same 100 contacts into more booked appointments and more sold installs, provided the calendar can take the work, while a traffic spike at a leaking bottom stage just buys more unsold estimates.
That is why the measurement comes first: HVAC KPIs lists the numbers to pull weekly, booked-call rate and close rate included, before any new spend gets justified.
Capacity comes before demand
Growth plans can die in the calendar rather than the ad account: you cannot book estimates your techs cannot run.
BLS counted 409,670 wage-and-salary jobs for heating, air-conditioning and refrigeration mechanics and installers in May 2025, with a median wage of $61,010, about $29.33 an hour (BLS Occupational Employment and Wage Statistics; the count covers all industries, including commercial refrigeration, and excludes the self-employed).
The trade itself is projected to grow faster than the all-occupation average: BLS projects employment of HVAC mechanics and installers to grow 10.9% from 2025 to 2035, from 440,900 to 489,100 jobs including the self-employed, against a 3.5% all-occupation average, with about 40,600 openings a year.
Those openings include replacements for workers who leave the occupation, so they are not all new jobs, and no verified technician-shortage count exists to plan around.
As illustrative arithmetic only, not a benchmark: if a tech at your close rates and mix produces $200,000 of yearly revenue, a two-tech hire is a $400,000 capacity decision that has to pencil before any marketing dollar is added on top.
The replacement pipeline you already own
Aging equipment is demand that has not called you yet: among the 117.74 million US homes that use space heating, 38.20 million, about one in three, had main heating equipment 15 or more years old in 2020, and 23.54 million had equipment 20 or more years old (EIA Residential Energy Consumption Survey; the ages are household-reported).
Watsco, the largest HVAC/R distributor in North America, says in its 2025 annual report that the residential replacement market "has increased in size and importance over the past several years", and puts the mechanical life of central air conditioners and furnaces at "approximately 8 to 20 years" depending on region and usage.
That installed base is why maintenance agreements are a growth lever rather than paperwork: a signed agreement puts you first in line for the call when a 15-year-old furnace fails, and HVAC maintenance agreements covers the pricing and the pitch.
Unit economics before you scale
Scaling multiplies whatever unit economics you already have, good or bad, so know them before adding spend.
The cost base is measured: in 2022, plumbing, heating and air-conditioning contractors spent 31.5% of revenue on materials and supplies, 27.0% on payroll, 7.9% on fringe benefits and 7.1% on work subcontracted out (2022 Economic Census).
Do not subtract those lines from 100% and call the remainder profit: the Census does not itemize interest, taxes and insurance, so what is left is not a margin.
The nearest federal figure on profit in these sources comes from tax returns: IRS data show corporate plumbing and HVAC contractors reported net income of about 4.8% of receipts in tax year 2022, after owners' pay, and about 70% of those returns reported a net income.
That is taxable income on corporate returns, plumbing and HVAC combined, so it describes the industry instead of setting a target for a residential shop.
What HVAC business growth looks like in two disclosures
Two 2026 franchise disclosure documents show how wide the spread in contractor revenue is.
Aire Serv's 2026 Franchise Disclosure Document reports that 172 US franchised businesses open for all of 2025 averaged $1,561,361 in gross sales, with a median of $944,801; only 57 of the 172 reached the average.
One Hour Heating & Air Conditioning's 2026 disclosure document reports average gross revenue of $4,082,652 per franchisee, with a median of $2,217,669, for the 88 franchisees operating all of 2025, and $605,630 per territory across those franchisees' 364 territories.
Read those numbers with their limits: they are franchisee-reported and unaudited, they are revenue rather than profit, and a named franchise system is never the average HVAC company.
The gap between each average and its median is the useful part: in both systems the average sits well above the median, and at Aire Serv only 57 of 172 businesses reached the average, so a minority of operators set the headline number.
If the aim is an eventual sale rather than scale, HVAC business valuation covers how buyers read a contractor's numbers.
How to scale an HVAC business, in order
Fix booking and closing first
Raise booked-call rate and estimate close rate on the volume you already get, because every later dollar is multiplied by these two rates.
Build the repeat base
Sign maintenance agreements and reactivate past customers, so replacement demand shows up as owned demand before you pay for new contacts.
Add capacity deliberately
Hire against a weekly job count you can actually run, and price the hire against the revenue it can realistically produce.
Then buy demand
Only after the first three hold, add paid channels one at a time and judge each on cost per booked install.
Where buying more leads fits
Lead buying is the last stage to add, and HVAC lead generation covers the owned, paid and bought channels in detail.
The judgment that matters is cost per booked install rather than cost per lead, because a cheap contact that never books or closes costs you everything you paid for it.
To find out which stage leaks first at your company, start with the free audit: a prioritized plan of what to fix, within 3 business days, no call required.
Frequently asked questions
How do I grow my HVAC business without buying more leads?
Raise what happens after the contact first: booked-call rate, close rate on replacement estimates, maintenance agreements, and repeat work from past customers. Each one turns more of the demand you already have into booked work, and any leads you buy later multiply that instead of papering over it.
How many HVAC businesses are there in the US?
In 2023 there were 111,207 employer establishments in plumbing, heating and air-conditioning contracting (Census County Business Patterns) plus 178,663 nonemployer businesses with no paid employees (Census Nonemployer Statistics), roughly 290,000 combined, about 62% with no employees (computed across the two Census programs). Both counts include plumbing, so they give no HVAC-only count.
What percent of HVAC businesses fail?
No HVAC-only failure rate is in the sourced data, which covers construction as a whole: of private construction establishments that opened in the year ended March 2015, 83.3% survived one year and 57.5% survived five years (BLS Business Employment Dynamics), and an establishment that disappears may have been sold or merged rather than failed.
What is the difference between growing and scaling an HVAC business?
Growing adds revenue by adding resources roughly in step: more techs, more trucks, more leads. Scaling raises revenue per resource first (booking rate, close rate, repeat work), then adds resources on top of working numbers, which is the cheaper order.
How fast should an HVAC company grow?
No sourced benchmark exists for HVAC growth rates, so judge speed against your own capacity and cash flow. For context, BLS projects employment of HVAC mechanics and installers to grow 10.9% from 2025 to 2035 against a 3.5% all-occupation average, so projected demand for the work itself is growing.