Comfort Systems USA pairs a record $14.06 billion backlog and 25.9% gross margins with data-center and modular-construction growth, but its premium valuation leaves shares vulnerable to any hyperscaler spending slowdown.
Overview
Comfort Systems USA (NYSE: FIX) is a U.S. mechanical, electrical, and plumbing contractor that has repositioned from regional commercial services toward mission-critical data-center and industrial infrastructure. Mechanical Services contribute about 70% of revenue and Electrical Services about 30%; technology and advanced manufacturing together account for 75.1%, with technology alone at 57.6%. Its national network of more than 170 locations and expanding factory-prefabrication platform support large, labor-constrained projects. Q2 2026 revenue increased 50.3% year over year to $3.27 billion, diluted EPS rose to $12.53, gross margin reached 25.9%, and operating margin was 17.1%; backlog hit a record $14.06 billion. Management raised full-year same-store growth expectations to the mid-to-high 30% range and sees visibility through 2026 and into 2027. **The modular model is driving both execution advantages and unusually strong margins**, while a net-cash balance sheet supports expansion and acquisitions. Shares at $1,635 trade at 33.3x FY2026E forward EPS and 4.4x FY2026E sales, a substantial premium to historical and market benchmarks. Near-term catalysts include capacity expansion toward 5 million square feet, Hunt Electric synergies, and continued hyperscaler spending; the premium leaves limited tolerance for backlog or CapEx disappointment.