stockrowWhat it does
Comfort Systems USA is a U.S. mechanical and electrical contractor founded in 1997 and headquartered in Houston. Brian Lane is President and Chief Executive Officer. The company designs, engineers, installs, renovates, maintains, repairs and replaces mechanical, electrical and plumbing systems in commercial, industrial and institutional buildings.
Its mechanical work includes heating, ventilation and air conditioning, plumbing, piping, controls, off-site construction, monitoring and fire protection. Its electrical work includes electrical construction and engineering, electrical logistics, system installation and electrical service. In plain terms, it equips buildings with systems that provide heating, cooling, ventilation, water distribution, power and associated controls.
The company operates through 50 operating units with 190 locations in 142 U.S. cities. Local management teams run day-to-day operations, while regional and centralized functions support areas including safety, insurance, benefits, training and cash management. It employed 22,700 people as of December 31, 2025.
Work ranges from designing and installing systems for a new facility to upgrading an occupied building or responding to a maintenance call. The company also fabricates some ductwork, conduit and piping and assembles certain components before site installation. It provides remote monitoring of building-system measures including power use, temperature, pressure, humidity and air flow.
How it makes money
Comfort Systems earns most of its revenue from project-based construction and replacement work. Customers request bids for installation projects, and the company estimates labor, materials and other costs before offering a contract price and payment terms. Much of this work is fixed-price: the company can earn additional payment through change orders when specifications or site conditions require extra work, but unrecovered cost overruns can reduce or eliminate project profit. It also undertakes some cost-plus and time-and-materials work, generally with lower margins because the contractor bears less overrun risk.
The business has two segments. The Mechanical segment includes HVAC, plumbing, piping, controls, monitoring, fire protection and off-site construction. The Electrical segment installs and services electrical systems and performs electrical construction, engineering and logistics work. Mechanical segment revenue was $6.7 billion in FY2025 and Electrical segment revenue was $2.4 billion in FY2025; management said on the Q3 2026 call that construction represented 90% of revenue and service represented 10%.
Most revenue is tied to projects rather than recurring contracts. Approximately 92.7% of 2025 revenue came from installation in new or existing facilities. Projects averaged approximately $2.9 million and typically took six to nine months to complete as of December 31, 2025. Contracts normally provide for milestone or cost-incurred billings, though customers can retain a portion of payment until completion.
The remaining business is maintenance and repair of installed systems. This work may be performed after a service call, typically billed after completion, or under service agreements that generally run for one or more years and often renew automatically. The company also serves national and regional accounts with multiple sites through a national call center.
| Product or service | Revenue, FY2025 | Share | Change on the year |
|---|---|---|---|
| Mechanical Segment | $6.7 billion | 73.3% | 20.7% |
| Electrical Segment | $2.4 billion | 26.7% | 61.9% |
Customers and how it sells
Comfort Systems serves commercial, industrial and institutional customers, including building owners, developers, property managers, general contractors, architects and consulting engineers. Its work is performed in manufacturing, healthcare, education, office, technology, retail and government facilities, as well as multi-family residential projects.
Technology was 45.0% of 2025 revenue, followed by manufacturing at 22.1%. Healthcare, education, government, office buildings, retail, restaurants and entertainment, multi-family and residential, and other sectors comprised the remainder. The largest customer represented 12.8% of consolidated 2025 revenue, and the largest customer can change from year to year.
The company operates across the United States, with 190 locations in 142 cities. It uses local operating companies for most customer relationships and delivery, supplemented by regional leadership and a national accounts group for multi-location service opportunities. It can also allocate engineering, field and supervisory labor among operating locations.
Management said on the Q3 2026 call that industrial customers accounted for 76% of revenue in the first nine months of 2026 and that technology, included within industrial, accounted for 59%. Institutional markets accounted for 16% and commercial markets for about 8% of revenue. Management also said most service revenue is generated from commercial customers.
| Segment | Revenue, FY2025 | Share | Change on the year |
|---|---|---|---|
| Mechanical Segment | $6.7 billion | 36.7% | 20.7% |
| New Construction | $5.8 billion | 31.6% | 44.4% |
| Electrical Segment | $2.4 billion | 13.3% | 61.9% |
| Existing Building Construction | $2.1 billion | 11.6% | 8.91% |
| Service Calls, Maintenance and Monitoring | $661.6 million | 3.63% | 5.21% |
| Service Projects | $568.8 million | 3.12% | 21.3% |
Suppliers and costs
Labor, materials and overhead make up most cost of service, and labor management and utilization have the greatest effect on project performance. Direct purchases of commodities and finished products are estimated at between 40% and 45% of average project cost.
Materials and components include ductwork, pipe, valves, fittings, electrical wire, conduit, fixtures, fabricated steel and sheet metal. The company generally obtains them from a variety of domestic and foreign suppliers at competitive prices, and it does not have significant contracts guaranteeing supply. It fabricates some ductwork, conduit and piping itself, including at centralized fabrication locations.
Named manufacturers of important equipment include Trane, Carrier, York and Daikin for HVAC equipment; Baltimore Aircoil and SPX for cooling towers; Schneider Electric, Eaton and ABB for electrical switchgear; Caterpillar, Cummins and Kohler for generators; and Johnson Controls, Automated Logic and Siemens for building automation. Orders for commercial HVAC equipment, electrical switchgear and large power generators can have lead times exceeding six months. The company seeks to reduce commodity and tariff exposure by buying early and by including selected escalation or escape provisions in bids and contracts.
- Revenue$9.1B
- Cost of revenue−$6.9B
- Selling, general and administrative−$883.3M
- Operating income$1.3B
Competitive position
Comfort Systems operates in mechanical and electrical contracting markets that contain thousands of local and regional companies. Most of its operating units compete locally or regionally. Customers select contractors based on price, relationships, quality, timeliness, reliability, financial strength, bonding access, service range and scale. The company states that price for value is generally the most influential consideration in provider selection.
Smaller owner-operated contractors commonly compete through pricing and established local customer relationships. Larger contracting companies, utilities and MEP equipment manufacturers may compete in some of the same service lines and locations, and some have greater financial resources or can offer financing and broad service or product packages. No individual competitors are identified.
The company seeks to compete through design-and-build work, maintenance and replacement services, multi-location coverage, a broad service range, design and building-information-modeling investment, prefabrication, resource sharing among locations, workforce training and surety relationships. It has 50 operating units, whose local teams retain responsibility for day-to-day operating decisions, while regional leadership supports cooperation between locations and implementation of operating practices. The company monitors project selection, estimating, pricing, safety, execution and labor utilization across its operations.
Our reading: Its local operating presence and national ability to move labor are meaningful operating advantages, but they are not exclusive because competition is fragmented and barriers to entry are low in many markets. [item1; item7]
Our reading: Design capability, multi-location coverage, scale and access to bonding can support customer selection, but price remains central to project awards. [item1; item7]
Structural risks
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Economic downturns can reduce construction activity, particularly new installation and renovation work. Building construction, renovation and replacement decisions are generally made project by project and can be deferred when customers face economic or financial uncertainty.
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Much project work is fixed-price. If estimates of labor, materials, timing or other project costs prove wrong, or if cost overruns cannot be recovered through change orders, profitability can decline and individual projects can incur losses.
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The business depends on attracting and retaining qualified craft workers, engineers, technicians, supervisors and managers. Management said on the Q3 2026 call that labor availability is the principal constraint on its ability to take on work.
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Material, equipment and component supply can be delayed, particularly for commercial HVAC equipment, electrical switchgear and large power generators. Higher labor costs, commodity costs, tariffs and supply-chain interruptions can affect project execution and margins.
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Acquisitions can introduce integration, employee-retention, legal-liability, financial-reporting and internal-control risks. The company may not realize anticipated cost savings, financial benefits or synergies from acquired businesses.
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Operations are subject to licensing, building-code, wage, safety, environmental and other regulations. The company also retains substantial exposure to workers’ compensation, employer’s liability, auto liability, general liability and employee health claims through large deductibles.
Bottom line
Our reading
Our reading: Comfort Systems is a project-led mechanical and electrical contractor whose service work adds recurring maintenance and repair activity, while most revenue depends on winning and executing construction and replacement projects. [item1; item7]
Our reading: Its operating model combines local customer relationships and decision-making with national scale, resource sharing, fabrication and a growing modular capability. [item1; call_qa]
Our reading: Demand and backlog have risen with industrial and technology work, but fixed-price execution, skilled-labor availability, equipment costs and construction-cycle exposure remain central to its results. [item1a; item7; call_qa]