Comfort Systems USA
Project-based specialty trade contractor: installs and services HVAC, plumbing, piping, controls, and electrical systems for commercial/industrial/technology buildings, increasingly via modular/prefab. Revenue recognized over time on construction contracts (~75% fixed-price); growing higher-margin service/maintenance and modular tail. Grows organically + via tuck-in acquisitions of regional MEP firms.
The thesis on this name
State of Data-Center Power
The mechanical/electrical-contracting toll that gets paid to physically build the cooling and power rooms regardless of which OEM wins inside them — a labor-and-execution moat, not a technology bet. Record backlog $12.45B in Q1 2026 (up from $6.89B YoY), advanced-technology (mainly datacenters) = 56% of Q1-2026 revenue, Q1 revenue +56.5% YoY to $2.87B, gross margin expanded to 26.3% from 22% (fact). The scarce input is skilled trades and execution capacity, which compounds pricing power during the buildout. Less single-OEM risk than any pure-play; the strongest expression of 'sell shovels to every datacenter regardless of the cooling architecture.'
State of Data-Center Power
The MEP contractor that physically builds datacenter mechanical/electrical rooms — backlog doubled to ~$12.45B, tech ~45% of revenue, record margins.
State of Data-Center Power
Backlog doubled to $12.45B, tech 45% of revenue; physically builds the mechanical/electrical rooms, PEG-cheaper than VRT.
Earnings, margins, COGS & capex
FIX is in an extraordinary up-cycle: FY2025 revenue rose 29.5% to $9.10B and Q1 FY26 surged 56.5% YoY to $2.87B (51% organic), driven by hyperscale data-center construction (technology/advanced-tech now ~56% of Q1 revenue vs ~45% of FY2025). Record gross margin of 26.3% (record) and 17.0% operating margin reflect favorable mix, change orders, and scale on labor-constrained work the company can price for. The model is asset-light and cash-generative — $1.04B FY2025 FCF on only $155M capex — though FIX is now stepping up modular capex toward ~5% of revenue to expand prefab capacity.
Income statement — where each revenue dollar goes
% of revenueOf every $1 of revenue, ~74¢ is cost of goods and ~9¢ operating expense, leaving ~17¢ of operating profit (~13¢ net).
Revenue trend
Margins
up
up
up
up
COGS structure
COGS is 'cost of services' — ~74-76% of revenue (FY2025 $6.91B / $9.10B). The dominant drivers are direct skilled construction labor (electricians, pipefitters, HVAC techs — the binding constraint), subcontractor costs, and materials/equipment (sheet metal, copper/steel piping, switchgear, chillers, controls). Labor scarcity is structurally tightening, but FIX is offsetting via modular/prefab (shop labor + factory throughput), favorable project pricing, and change orders that lift gross margin.
Capex
Light historically (~$155M, ~1.7% of revenue FY2025) for vehicles, tools, and prefab shops. FY26 step-up to ~5% of revenue funds a major modular/prefabrication expansion — targeting ~4M sq ft of modular capacity by end-2026 (~17% of revenue) — backed by multi-year hyperscaler commitments. M&A is a parallel capital use (e.g., a Western-US electrical contractor closing May 2026, ~$250M annualized revenue, 8-10% EBITDA margin).
Latest earnings
Large beat on both lines. Revenue $3,265.7M vs a Zacks consensus of roughly $2.94B (+10.96% surprise); diluted EPS $12.53 vs a $10.38 Zacks consensus (+20.71% surprise), and +91.9% against $6.53 in Q2 FY25. Net income $441.6M vs $230.8M. Notably, the beat was NOT bought: the stock rose only 2.24% on the print (2026-07-23) and then fell 5.33% on the call day and 6.02%/6.54% on 2026-07-28 and 2026-07-29 before recovering 11.70% on 2026-07-30 — a sector-sentiment tape, not a company-specific one.
Comfort Systems does not issue numeric guidance. The 10-Q's forward language: "we anticipate high ongoing demand leading to solid earnings for the remainder of 2026" and expects "supportive conditions for our industry, especially for our manufacturing and technology customers" to continue for the remainder of 2026; management's release adds that pipelines make them "optimistic about our results for the remainder of 2026 and well into 2027." The Street is materially more conservative than the run-rate: Zacks FY2026 consensus is $43.09 EPS on $11.89B revenue, which implies 2H26 revenue of ~$5.76B against 1H26's $6.13B and 2H EPS of ~$20.06 against 1H's $23.03 — consensus already models the peak as in. Q3 consensus is $10.79 EPS on $2.98B. Zacks Rank #3 (Hold) with a "mixed" revisions trend.
- Q2 revenue
- $3,265.7M (+50.3% YoY; +43.8% same-store) — first $3B quarter
- Backlog
- $14.06B at 2026-06-30 (+73.1% YoY from $8.12B; +12.9% sequential from $12.45B); same-store $13.70B, +68.7% YoY and +11.2% sequential
- Technology customer revenue
- $1,917.4M = 58.7% of Q2 revenue, up from 43.0% a year ago; $3,533.9M = 57.6% of 1H26
- Diluted EPS
- $12.53 (+91.9% YoY); $23.03 1H26
- Operating cash flow
- $1,139.4M in the quarter (vs $252.5M PY) — the first $1B operating-cash-flow quarter; $1,528.3M 1H26 vs $164.5M
- Free cash flow
- $999.3M in the quarter; $1,241.5M 1H26 (company definition)
- Electrical segment
- Revenue $969.0M, +81.2% YoY (+$132.6M from Hunt/Feyen Zylstra/Meisner, +$301.7M same-store); now 29.7% of revenue vs 24.6%
- Dividend
- Raised to $0.90/quarter on 2026-07-23, a $0.10 (+12.5%) increase, payable 2026-08-24
- Net cash
- ~$1.80B ($1,854.8M cash vs $54.1M debt at 2026-06-30)
Growth drivers
- Hyperscale AI data-center construction — the demand engine; technology ~56% of Q1 FY26 revenue, the primary source of backlog growth
- Backlog conversion — record $12.45B backlog (+80.8% YoY) gives multi-quarter revenue visibility
- Modular/prefabrication scale-up — higher throughput and margin on labor-constrained work; ~4M sq ft target by end-2026
- Electrical mix shift — industrial electrical revenue +88% organically in Q1 FY26, a fast-growing higher-content scope
- Margin expansion from favorable pricing/change orders on scarce-capacity work + operating leverage
- Tuck-in M&A of regional MEP firms (e.g., Western-US electrical, ~$250M revenue, closing May 2026)
Reported financials — SEC EDGAR
Audited GAAP figures pulled from SEC filings · latest filing 2026-02-19. The audited primary-source spine — not financial advice.
Revenue — annual (GAAP)
Margins & balance sheet — FY’25
Bull & bear
The quarter answered the single question the entry was watching — is the backlog cresting — with a flat no. Backlog went to $14.06B (+73.1% YoY, +12.9% sequential, +68.7% same-store), organic revenue grew 43.8%, and margins held at 25.9% gross / 17.1% operating with the Q1 change-order benefit explicitly behind them. The balance sheet turned into a ~$1.80B net-cash fortress on a single $1.14B operating-cash-flow quarter, and the dividend went up 12.5%. The bull case is stronger on evidence than it was in June, and the stock is 16% cheaper than its peak close.
- Backlog accelerated rather than stalled: $14.06B, +73.1% YoY and +12.9% sequentially, with same-store up 68.7% YoY — the growth is bookings, not acquisitions (Hunt added only $217.4M of the $1.61B sequential gain)
- Growth is overwhelmingly organic: of the 50.3% Q2 revenue increase, 43.8pts were same-store and only 6.5pts acquired; the electrical segment grew 81.2% with $301.7M of that same-store
- The 'margins are fake' objection weakened materially: the 10-Q attributes the $43.1M of favorable change orders to the FIRST quarter, and Q2 still printed 25.9% gross (vs 23.5% PY) and 17.1% operating (vs 13.8%) with no disclosed one-timer
- Cash conversion is extraordinary and self-funding: $1,139.4M operating cash flow and $999.3M FCF in one quarter took cash to $1,854.8M against $54.1M of debt — ~$1.80B net cash funding a stepped-up modular capex program, tuck-in M&A and a 12.5% dividend raise simultaneously
- Modular is being built out with cash, not credit: $188.9M of 1H building purchases, and the Texas modular operation alone added $1.87B of backlog YoY and $510.2M sequentially — the mechanism to convert labor-gated demand into revenue is visibly funding itself
- Management extended the visibility window on the record: pipelines make them 'optimistic about our results for the remainder of 2026 and well into 2027' — the first time the commentary reaches past the current year
- Valuation compressed while fundamentals expanded: at $1,729.69 the stock is ~16% below its 2026-06-22 closing high of $2,066.51 and trades at ~42.6x TTM EPS of $40.64 on TTM revenue that grew 46%
Every diversifier got smaller. Technology is now 58.7% of revenue (43.0% a year ago) and new construction 75.1% (57.9%), so the entire business is levered to one capex cycle at one moment in that cycle. The record cash flow is heavily customer-financed float that unwinds if bookings slow, capex is up 5.4x year-on-year, and the Street's own FY2026 numbers already model 2H revenue and EPS BELOW 1H. The market's reaction — a 2% pop on a 20% EPS beat followed by two 6% down days — says the multiple, not the print, is the risk.
- Concentration deepened rather than diversified: technology went from 43.0% to 58.7% of revenue in twelve months and new construction from 57.9% to 75.1%, while education (-13.6%), office buildings (-16.3%) and other ballast lines shrank in absolute dollars
- The cash flow is float, not earnings: $1,061.5M of the $1,528.3M 1H operating cash flow came from the swing in billings in excess of costs and deferred revenue — customer advance payments on projects not yet executed, which reverse as the work is performed and stop growing the moment bookings plateau
- Consensus itself assumes the peak is in: Zacks FY2026 of $11.89B revenue and $43.09 EPS implies 2H26 revenue of ~$5.76B vs 1H26's $6.13B, and 2H EPS of ~$20.06 vs $23.03 — the sell side is modelling a sequential decline off a quarter that just grew 50%
- Asset-light is eroding: capex ran $288.8M in 1H26 against $53.5M in 1H25 (5.4x), the 10-Q says full-year 2026 will be 'higher than our recent average', and property and equipment on the balance sheet jumped from $388.0M to $653.9M in six months — the modular bet converts an operating-leverage story into a fixed-cost one
- Fixed-price execution risk scales with the mix: 75.1% of revenue is now new construction, the 10-Q warns that cost overruns not recovered in change orders produce 'reduced profits or even significant losses' on fixed-price work, and the projects are getting larger and more concentrated (single Texas operations driving $219.4M and $186.6M of the quarterly increase)
- The tape is repricing the sector independent of the fundamentals: a +20.7% EPS surprise bought only +2.24%, followed by -5.33%, -6.02% and -6.54% days — the multiple is hostage to hyperscaler capex sentiment, and the stock is still ~42.6x TTM / ~40x FY2026 consensus EPS
- Backlog quality is untestable from outside: the same-store gain is concentrated in a handful of named operations and the filing gives no customer concentration, no cancellation history and no fixed-price share — a $14.06B number the reader has to take on trust
What it is worth
Forward P/E vs MEP/E&C peers, cross-checked with a reverse-DCF read on implied growth (web-grounded; not financial advice).
~$1,200-1,450
a data-center capex digestion or margin normalization to mid-cycle (~13-15% operating) with multiple compression to ~28-32x peer levels.
~$1,900-2,050
roughly current; ~40-42x on ~$35 FY26 EPS as growth decelerates toward ~11% but backlog underwrites the print.
~$2,400+
if FY26 EPS lands above the ~$34.65 Street figure (mid-to-high-20s same-store growth holds) and core margins stay near record, a sustained ~40x+ multiple supports upside.
At ~$1,983 and ~$70B cap, FIX trades ~42x forward EPS (Street ~$34.65 FY26) vs ~23x peer-group average and EME/MYRG in the high-20s-to-30s — a premium for best-in-class data-center exposure, net cash, and record margins; the multiple already embeds durable hyperscaler capex and only modest margin give-back.
SWOT
Strengths
- Largest pure-play US MEP contractor with national scale, a deep regional operating-company network, and entrenched hyperscaler relationships — hard to replicate
- Record financials: $12.45B backlog (+80.8%), 26.3% gross margin, $1.04B FY2025 FCF on light capex
- Fortress balance sheet — net cash (~$982M vs ~$145M debt), funding modular capex, M&A, and a rising dividend from internal cash
- Modular/prefab capability that converts scarce field labor into factory throughput — a structural margin and capacity edge
- Disciplined tuck-in M&A track record rolling up fragmented regional MEP firms
Weaknesses
- Revenue is project-based and cyclical — recognized over time on construction contracts, with ~75% fixed-price exposure to cost overruns
- Heavy and rising dependence on a single end-market (data centers, ~56% of revenue) and a handful of hyperscaler customers
- Skilled-labor scarcity is the binding growth constraint — management explicitly says it could take more work if it could staff it
- Record margins are partly flattered by non-recurring change orders ($43M in Q1) — core margin (~25.2%) is the cleaner read
- Limited recurring revenue relative to a software or services model — backlog must be continually replenished
Opportunities
- Multi-year AI/data-center capex super-cycle from hyperscalers (Microsoft, AWS, Google, Meta, Oracle) — durable demand visibility
- Modular expansion to ~4M sq ft (~17% of revenue) — capacity to capture demand it currently turns away, at better margin
- Electrification / higher electrical content per project — industrial electrical +88% organically
- Continued consolidation of a fragmented ~$200B+ US MEP market via accretive acquisitions
- Reshoring/industrial buildout and grid/power infrastructure as adjacent demand pools
Threats
- A data-center capex pause or AI-spend digestion would hit the dominant growth driver hard given concentration
- Skilled-trade labor inflation or shortage that caps revenue or compresses margin
- Margin normalization — record change-order and pricing benefits are unlikely to persist as comps toughen in 2H FY26
- Customer concentration / pricing power shifting to hyperscalers as they standardize and in-source design
- Rich valuation (~42x forward P/E) leaves little room for any growth or margin disappointment
Moats, dependencies & bottlenecks
Moats
Largest US pure-play MEP contractor; breadth, balance sheet, and bonding capacity hyperscalers require for mega-projects — hard for regional firms to match.
Multi-year commitments and proven delivery on mission-critical mechanical rooms create switching friction, but customers are large and sophisticated and can multi-source.
Factory throughput converts scarce field labor into capacity + margin; a real edge today but capital and know-how are replicable by EMCOR and others over time.
23,000+ skilled tradespeople in a structurally short market is itself a scarce asset; the constraint that gates rivals also protects FIX's pricing.
Net-cash balance sheet and surety capacity let FIX bid the largest projects competitors can't underwrite.
Dependencies
AWS, Google, Meta, Oracle) ~56% of revenue and most backlog growth; a capex digestion/pause is the single biggest swing factor.
pipefitters, HVAC techs) Binding growth constraint — management explicitly says it could take more work if it could staff it.
switchgear, chillers, copper/steel piping, controls Lead times and price (tariff-exposed metals/equipment) affect cost and schedule on fixed-price work.
Construction is inherently cyclical; current demand is a once-in-a-cycle AI infrastructure wave that will eventually normalize.
Tuck-in M&A (e.g., Western-US electrical, ~$250M revenue) supplements organic growth; not essential but additive.
Advantages
- Largest US pure-play MEP contractor — scale, bonding capacity, and national reach for hyperscale mega-projects
- Net-cash balance sheet (~$982M cash, ~$145M debt) self-funding modular capex, M&A, and a rising dividend
- Record backlog ($12.45B, +80.8%) delivering multi-quarter revenue visibility competitors lack
- Modular/prefab know-how that monetizes scarce labor at higher margin and faster throughput
- Disciplined operator culture and acquisition machine in a fragmented market
- Direct, deep exposure to the AI data-center capex super-cycle with proven mission-critical delivery
Weaknesses
- ~56% revenue concentration in data centers / a few hyperscaler customers — a single-cycle dependency
- Cyclical, project-based, ~75% fixed-price revenue with cost-overrun and execution risk
- Record margins partly inflated by non-recurring change orders ($43M in Q1 FY26)
- Growth supply-gated by skilled-labor scarcity it cannot quickly relieve
- Limited recurring revenue — backlog must be continually replenished
- Rich valuation (~42x forward P/E) leaves no margin for error on growth or margin
Bottlenecks
- Skilled-trade labor availability — the #1 cap on revenue; FIX adds 3,000-4,000 workers/yr (now 23,000+) but demand outruns hiring
- Modular/prefab capacity — being expanded toward ~4M sq ft (~17% of revenue) precisely because it is the lever to break the labor bottleneck
- Equipment/material lead times (switchgear, chillers, transformers) that gate project schedules industry-wide
- Bonding/working-capital capacity on ever-larger mega-projects (mitigated by net-cash balance sheet)
- Project execution bandwidth — management is selectively turning away work it cannot staff
Top signals & trends
Top signals
The cleanest leading indicator of forward revenue; watch for any sequential stall as the read on whether the data-center wave is cresting.
FIX's demand is downstream of these budgets; any 'digestion' language is an early warning given ~56% concentration.
Headline 26.3% is flattered by $43M one-time items; the core trajectory tells you if pricing power is durable.
Execution on the prefab buildout is the mechanism to convert turned-away, labor-gated demand into revenue.
2H FY26 comps toughen materially; holding the guide would confirm demand durability.
Hiring pace is the binding constraint on how much backlog can actually be converted.
Trends
The core driver — hyperscale buildout pushed technology to ~56% of revenue and doubled backlog; the single most important tailwind.
Shifts scarce field labor into factory throughput — FIX's ~4M sq ft target turns a constraint into a margin/capacity edge.
Caps revenue and inflates cost, but the same scarcity gives FIX pricing power and protects it from sub-scale rivals.
Industrial electrical +88% organically; higher-content scope expands addressable revenue per data center.
Fragmented ~$200B+ US market gives FIX a long accretive tuck-in M&A runway (e.g., Western-US electrical, ~$250M).
Switchgear, transformers, and metals pricing/lead times pressure fixed-price contract costs and schedules.
Ecosystem & competitor graph
Suppliers feed the company; customers pull from it. Line thickness shows the strength of each tie (supply-chain dependency, customer earnings contribution). Hover to isolate a tie.
HVAC/chiller and cooling equipment maker — core mechanical content for data-center thermal systems.
Chillers, air handlers, and thermal management equipment installed in mechanical rooms.
HVAC equipment, building controls, and chillers — both supplier and controls partner.
Electrical switchgear, power distribution, and busway for data-center power rooms.
Data-center thermal management, power, and liquid-cooling systems integrated by FIX.
Electrical enclosures, connection, and power-management gear (Schneider is non-US/France-listed).
Hyperscaler — Azure AI data-center buildout; a primary end-customer of the mechanical/electrical scope FIX installs.
Hyperscaler data-center construction demand.
Google Cloud / AI data-center capex.
AI/data-center capex super-cycle customer.
OCI data-center expansion — fast-growing hyperscale demand.
General contractors / colocation operators (Turner, DPR, Digital Realty, Equinix) FIX often contracts under GCs or directly for colo operators (Digital Realty DLR, Equinix EQIX) on data-center projects.
Closest large-cap peer — diversified mechanical/electrical construction + facilities services with strong data-center exposure; bigger services tail than FIX.
Safety/specialty services and infrastructure contractor; adjacent rather than head-to-head on MEP, but competes for industrial/infrastructure capital and talent.
Electric power / infrastructure leader; overlaps on the electrical/grid and data-center power side, less on mechanical.
Electrical construction (T&D + commercial/industrial) with record backlog from grid modernization and data centers; competes on electrical scope.
Smaller MEP/building-systems contractor pivoting to owner-direct and data-center/mission-critical work; a niche competitor.
Fragmented field of regional mechanical/electrical firms; collectively the broadest competitive set and FIX's M&A target pool.