Comfort Systems USA, Inc.

The company carried a $12.45 billion backlog as of March 31, 2026, representing approximately 16 months of FY2025 revenue and providing well above-average forward project visibility. The 36.8% share of revenue from maintenance, renovation, and repair work (FY2025) adds a recurring service layer, but the majority remains project-based installation without contractual recurring characteristics.

Mechanical services generated 73.3% of FY2025 revenue and electrical services 26.7%, with both segments tied to the same construction and renovation cycle. Technology-sector projects represented 45.0% of FY2025 revenue and grew to 56% of Q1 2026 revenue, concentrating roughly half the company in a single end market.

Revenue is generated almost entirely within the United States, a profile reinforced by 19 of the company's 21 acquisitions being domestic. Operations in Canada and the United Kingdom are immaterial to consolidated revenue, leaving meaningful sensitivity to US construction and regulatory cycles.

The core business is labor-intensive, requiring skilled field tradespeople deployed to each project site, creating a near-linear relationship between revenue and headcount. The modular off-site construction program, targeting 4 million square feet of fabrication capacity by end-2026, introduces partial operating leverage but does not fundamentally alter the cost structure across the majority of revenue.

Installation into newly constructed facilities accounted for 63.2% of FY2025 revenue, a project-based category that is non-recurring and dependent on ongoing construction activity. The remaining 36.8% from maintenance, repair, and renovation carries higher repeatability, but the overall mix is weighted toward transactional project work rather than contractual recurring streams.