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The 1990s produced a wave of companies that tried to build national HVAC and mechanical contracting businesses. Most of them failed. One survived by doing almost the opposite of what the others attempted, and spent the next two decades waiting for the economy to need exactly what it had built.
📊 Snackable Stat: $11.94 B
Backlog at the end of 2025, up 99.3% year-over-year, with technology and modular bookings driving more than half the sequential increase.
Here’s what you’ll learn:
Why the U.S. mechanical and electrical contracting industry stayed fragmented for decades
How Comfort Systems built a decentralized holding company that grew nationally without destroying the local expertise that made its acquisitions valuable in the first place
Why the rise of AI demand, semiconductor reshoring, and data center construction converted a sleepy HVAC roll-up into one of the decade's best industrial compounders
Too Local to Grow, Too Big to Ignore
American commercial construction generates more money than most people realize, with the revenue going mostly to companies that most people have never heard of.
According to Comfort Systems' own 2024 10-K, commercial, industrial, institutional mechanical and electrical contracting generates approximately $550 billion in annual U.S. revenue. The market is enormous: wiring office buildings, piping pharmaceutical clean rooms, cooling data halls, and installing hospital HVAC. Its defining feature is geography. You cannot run an HVAC contracting business in Phoenix from an office in Atlanta. Work, labor, and relationships are local, and because the work is local, geography also sets a ceiling for growth.
A regional HVAC or plumbing contractor could build a strong business in its home market, with reliable crews, repeat clients, and a reputation that took fifteen years to earn. Expanding beyond that geography meant either hiring blind into new cities or buying a competitor at arm's length, where the seller walks out the door with everything that made the company worth owning in the first place. Neither path was reliable, so most regional contractors never tried.
Those who did try consolidation tended to treat it like manufacturing: strip the overhead, standardize the processes, squeeze the margins. A wave of publicly traded roll-ups ran this exact playbook in the late 1990s, and most of them failed. They killed the culture that made their acquisitions worth doing. Customers noticed when familiar crews and managers disappeared. Employees left for competitors who still treated them like tradespeople. The 1990s consolidation wave in specialty contracting is still remembered as an object lesson in how to win the deal and lose the business.
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Buying Everything, But Changing Nothing
Comfort Systems USA was formed in 1997 from the consolidation of twelve regional contractors, IPO'd that June, and set out to solve exactly the problem its competitors had botched.
The model: buy excellent regional contractors, give them access to capital and group-level purchasing leverage, and leave local management in place. Most corporate acquirers can't resist the urge to centralize or restructure. What Comfort Systems was buying would evaporate under that pressure, so retaining it meant treating each acquisition as a long-term partnership rather than an extraction event.
The model compounded slowly, then quickly. By the end of 2024, Comfort Systems operated 47 units across 136 U.S. cities. Revenue grew from $3.07 billion in 2021 to $5.21 billion in 2023, solid growth that didn't turn heads in a market conditioned to chase software multiples. The more important story was in the backlog, the project mix, and one acquisition announced on January 2, 2024.
On that day, Comfort Systems acquired Summit Industrial Construction, a Houston-based specialty contractor already deployed on several major chip fabrication projects. Summit covered modular systems, large pipe rack trestles, process piping, and specialty concrete, with the capacity to execute large-scale prefabricated builds for hyperscale tech clients and semiconductor manufacturers. It added an estimated $360 to $400 million in annualized revenue.
Two structural forces were building simultaneously. The CHIPS and Science Act, signed in August 2022, committed over $52 billion to domestic semiconductor manufacturing, and the AI infrastructure buildout was accelerating alongside it. Both created urgent demand for exactly the kind of skilled mechanical labor that was already in short supply: the electricians' union estimates electrical work accounts for 45% to 70% of the total cost of building a data center, and a Brookings Institution senior fellow called the shortage of qualified electricians "a leading barrier to data center construction." Comfort Systems had the crews. The market needed the crews.
From Ductwork to Data Centers
Revenue jumped from $5.21 billion in 2023 to $7.03 billion in 2024, a 35% increase, then to $9.10 billion in 2025, a further 30% gain. Net income crossed $1 billion for the first time in 2025, up from $522 million the year before, a 95% increase in a single year. For a mechanical contractor, those numbers belong in a different industry.
What drove it was project mix. Technology-related work climbed to 45% of revenue in 2025, up from 33% the year before. AI data centers and semiconductor fabs require specialized mechanical work that is awarded on capability, not price, and the margin profile shows it: gross margin expanded from 21.0% in 2024 to 24.1% in 2025, operating margin hit 14.4% for the full year, and free cash flow crossed $1 billion.
The service segment is quietly reinforcing the moat. Maintenance contracts grew 12% in 2025 to approximately $1.2 billion, roughly 13% of total revenue, and that recurring base acts as a ballast against the lumpier construction cycle.
Backlog at year-end 2025 stood at $11.94 billion, nearly double the $5.99 billion a year earlier, and by Q1 2026 had grown to $12.5 billion. The stock has gained more than 1,500% over the past five years.
Risks remain: tariff-related cost pressures could compress the margins the market has priced in, and concentration toward hyperscaler capex means a data center slowdown would show up in bookings before reported revenue. Its current valuation demands considerably less patience than the business spent the last decade rewarding.
None of that diminishes what was built. A company that spent twenty years assembling a national network of skilled tradespeople found itself in exactly the right position when the most capital-intensive construction boom of the decade arrived.
Key takeaways to consider…
Treat Acquisition Like a Partnership, Not Just a Transaction. When the value of an acquisition lives in its people and customer relationships, the fastest way to destroy it is to treat it like a transaction. Retention means leaving management in place and resisting the urge to standardize what made the target worth buying in the first place.
Decentralized Models Compound Differently. Most roll-ups eventually try to extract value by centralizing the things they bought. Comfort Systems ran the opposite playbook by centralizing capital and purchasing leverage, and decentralizing execution and management. The result is a network of regional operators who still run their businesses like owners because they effectively are.
Patience Can Be Positioning. The strongest competitive positions are often invisible until the market needs them. Building deep capability in a narrow skill set or geography looks like slow growth until a structural shift makes that capability suddenly scarce. You do not have to predict the wave; you have to be in the water when it arrives.
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🍫 Power Numbers
$9.10 billion - Full-year 2025 revenue, up 30% year-over-year
$1.02 billion - Net income in 2025
$1.45 billion - Full-year 2025 EBITDA
14.4% - Full-year 2025 operating margin
45% - Share of revenue from technology-related projects in 2025
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