Comfort Systems USA (FIX)
Builds and services mechanical, electrical and plumbing systems for complex US facilities.
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Comfort Systems USA supplies the crews and know-how that make large buildings breathe, move water and receive power. Most money comes from big construction jobs, and the center of gravity is shifting toward data centers and factory-built system rooms. Repair and maintenance add repeat work, but growth increasingly hangs on a few huge technology customers, enough skilled workers and timely equipment deliveries.
Item facts: FY2025 · year ended Dec 31, 2025, from filings, earnings calls and company pages.
Judgment weights, not filed revenue
The band summarizes business focus and direction. ~ marks estimates.
6 in detail · 19 more below
New Construction
Field crews install the core mechanical and electrical systems in new buildings. This is roughly 45% of sales before factory-built work; companywide work under contract reached $14.06 billion in June 2026, making hiring, equipment arrivals and on-time completion the watchpoints.
Competes with U.S. Electrical and Mechanical Construction (EMCOR Group) · Commercial & Industrial Construction (MYR Group)
In plain English
Picture a new building as a shell that still needs lungs, veins and nerves. Comfort Systems designs and installs the cooling, plumbing, piping, power and controls that make it usable, often helping shape the plan before crews begin.
Owners or their main builders pay for skilled labor, bought equipment and management of the job. Many contracts set the price in advance, so good scheduling and productive crews protect the profit; labor shortages, late equipment or surprises can eat it.
Technology
Cooling, power, controls and installation for data centers produced 45.0% of FY2025 revenue, rising to 57.6% in the first half of 2026. One customer, unnamed and counted within Mechanical, alone supplied 12.8%; watch customer spending, local electricity supply and concentration.
Competes with Data-center mechanical and electrical construction (EMCOR Group) · Data Centers (Southland Industries)
In plain English
A data center is a warehouse full of computers, and all those machines need enormous amounts of power and cooling. Comfort Systems does not sell the computers; it builds the pipes, wiring, controls and equipment rooms that keep them running.
Operators of these giant computing sites, or the main builders they hire, pay for each construction package. Some have promised years of factory volume, encouraging Comfort Systems to add capacity. This is a view by customer type that runs through the construction and factory-built work, not a separate pile of sales.
Existing Building Construction
Crews add, replace or modernize systems inside buildings already in use. This supplied 23.3% of FY2025 revenue but fell about 16% in the first half of 2026; watch whether upgrades regain attention beside rapidly growing new construction.
Competes with Owner Direct Relationships (Limbach Holdings) · Building Services (EMCOR Group)
In plain English
Old buildings rarely stand still. A hospital may need more cooling, a factory may replace worn pipes, or an office owner may redo power and controls without tearing down the whole property. Comfort Systems plans and carries out those changes around what is already there.
The building owner or property manager pays for a defined renovation or replacement. The work can be tricky because crews must fit around operating rooms, hidden conditions and short shutdown windows. Solving those constraints well earns money; unexpected site problems can raise cost or delay completion.
Modular Construction
Whole equipment rooms are assembled in factories, shipped and connected at the building site. About 18% of FY2025 revenue came this way, and new orders were $510 million in the second quarter of 2026; how much each factory can finish is the key watchpoint.
Competes with Modular Power Solutions (Rosendin) · MegaMod (Vertiv) · Modular Solutions (Southland Industries)
In plain English
Instead of building every pipe-and-wire system outdoors piece by piece, Comfort Systems assembles room-sized sections under a factory roof. Finished cooling plants, power rooms and data-center assemblies travel by truck and are joined at the customer's site, much like delivering a fitted kitchen rather than cutting every cabinet in the house.
Customers pay for design, factory assembly, delivery and start-up. Repeating similar sections can save site time and make scarce workers more productive. The bet only works if committed orders keep the expanded factories busy and shipping stays on schedule.
Service Calls, Maintenance and Monitoring
Technicians answer breakdowns, perform planned upkeep and watch building systems for trouble. The line supplied 7.3% of FY2025 revenue; its job is to provide repeat work while technician availability, response time and customer retention govern growth.
Competes with Service Agreements (Trane Technologies) · BluEdge Service Platform (Carrier) · Building Services (EMCOR Group)
In plain English
When a cooling unit stops on a hot day, this is the phone call that gets it working again. The same crews also visit on a schedule to catch wear early, while monitoring systems warn when equipment drifts out of range.
Owners and national chains pay after a repair or at regular intervals under agreements that usually last at least a year but can often be cancelled quickly. A central call center sends work to nearby operating companies across many equipment brands. Repeat visits make this steadier than construction, although every dollar still needs an available technician.
Service Projects
These are replacements and improvements too large for a repair visit but smaller than major construction. They supplied 6.2% of FY2025 revenue; watch whether service technicians turn discovered problems into approved jobs without scarce crews being pulled elsewhere.
Competes with Owner Direct Relationships (Limbach Holdings) · Upgrade and Optimization Services (Trane Technologies) · Building Services Projects (EMCOR Group)
In plain English
Too large for one repair visit, too contained to remake a building: these jobs replace a large cooling machine, improve controls or renew a section of pipe or wiring. They have a clear start and finish, so they should not be mistaken for monthly repeat income.
Building owners pay after a failure, capacity need, rule change or desire to use less energy. Technicians often spot the need during routine visits, then hand the larger job to a project crew. Winning the work depends on customer approval and access to shut down the affected area.
New ConstructionField crews install the core mechanical and electrical systems in new buildings. This is roughly 45% of sales before factory-built work; companywide work under contract reached $14.06 billion in June 2026, making hiring, equipment arrivals and on-time completion the watchpoints.Field crews install the core mechanical and electrical systems in new buildings. This is roughly 45% of sales before factory-built work; companywide work under contract reached $14.06 billion in June 2026, making hiring, equipment arrivals and on-time completion the watchpoints.
In plain English
Picture a new building as a shell that still needs lungs, veins and nerves. Comfort Systems designs and installs the cooling, plumbing, piping, power and controls that make it usable, often helping shape the plan before crews begin.
Owners or their main builders pay for skilled labor, bought equipment and management of the job. Many contracts set the price in advance, so good scheduling and productive crews protect the profit; labor shortages, late equipment or surprises can eat it.
Competes with U.S. Electrical and Mechanical Construction (EMCOR Group) · Commercial & Industrial Construction (MYR Group)
TechnologyCooling, power, controls and installation for data centers produced 45.0% of FY2025 revenue, rising to 57.6% in the first half of 2026. One customer, unnamed and counted within Mechanical, alone supplied 12.8%; watch customer spending, local electricity supply and concentration.Cooling, power, controls and installation for data centers produced 45.0% of FY2025 revenue, rising to 57.6% in the first half of 2026. One customer, unnamed and counted within Mechanical, alone supplied 12.8%; watch customer spending, local electricity supply and concentration.
In plain English
A data center is a warehouse full of computers, and all those machines need enormous amounts of power and cooling. Comfort Systems does not sell the computers; it builds the pipes, wiring, controls and equipment rooms that keep them running.
Operators of these giant computing sites, or the main builders they hire, pay for each construction package. Some have promised years of factory volume, encouraging Comfort Systems to add capacity. This is a view by customer type that runs through the construction and factory-built work, not a separate pile of sales.
Competes with Data-center mechanical and electrical construction (EMCOR Group) · Data Centers (Southland Industries)
Existing Building ConstructionCrews add, replace or modernize systems inside buildings already in use. This supplied 23.3% of FY2025 revenue but fell about 16% in the first half of 2026; watch whether upgrades regain attention beside rapidly growing new construction.Crews add, replace or modernize systems inside buildings already in use. This supplied 23.3% of FY2025 revenue but fell about 16% in the first half of 2026; watch whether upgrades regain attention beside rapidly growing new construction.
In plain English
Old buildings rarely stand still. A hospital may need more cooling, a factory may replace worn pipes, or an office owner may redo power and controls without tearing down the whole property. Comfort Systems plans and carries out those changes around what is already there.
The building owner or property manager pays for a defined renovation or replacement. The work can be tricky because crews must fit around operating rooms, hidden conditions and short shutdown windows. Solving those constraints well earns money; unexpected site problems can raise cost or delay completion.
Competes with Owner Direct Relationships (Limbach Holdings) · Building Services (EMCOR Group)
Modular ConstructionWhole equipment rooms are assembled in factories, shipped and connected at the building site. About 18% of FY2025 revenue came this way, and new orders were $510 million in the second quarter of 2026; how much each factory can finish is the key watchpoint.Whole equipment rooms are assembled in factories, shipped and connected at the building site. About 18% of FY2025 revenue came this way, and new orders were $510 million in the second quarter of 2026; how much each factory can finish is the key watchpoint.
In plain English
Instead of building every pipe-and-wire system outdoors piece by piece, Comfort Systems assembles room-sized sections under a factory roof. Finished cooling plants, power rooms and data-center assemblies travel by truck and are joined at the customer's site, much like delivering a fitted kitchen rather than cutting every cabinet in the house.
Customers pay for design, factory assembly, delivery and start-up. Repeating similar sections can save site time and make scarce workers more productive. The bet only works if committed orders keep the expanded factories busy and shipping stays on schedule.
Competes with Modular Power Solutions (Rosendin) · MegaMod (Vertiv) · Modular Solutions (Southland Industries)
Service Calls, Maintenance and MonitoringTechnicians answer breakdowns, perform planned upkeep and watch building systems for trouble. The line supplied 7.3% of FY2025 revenue; its job is to provide repeat work while technician availability, response time and customer retention govern growth.Technicians answer breakdowns, perform planned upkeep and watch building systems for trouble. The line supplied 7.3% of FY2025 revenue; its job is to provide repeat work while technician availability, response time and customer retention govern growth.
In plain English
When a cooling unit stops on a hot day, this is the phone call that gets it working again. The same crews also visit on a schedule to catch wear early, while monitoring systems warn when equipment drifts out of range.
Owners and national chains pay after a repair or at regular intervals under agreements that usually last at least a year but can often be cancelled quickly. A central call center sends work to nearby operating companies across many equipment brands. Repeat visits make this steadier than construction, although every dollar still needs an available technician.
Competes with Service Agreements (Trane Technologies) · BluEdge Service Platform (Carrier) · Building Services (EMCOR Group)
Service ProjectsThese are replacements and improvements too large for a repair visit but smaller than major construction. They supplied 6.2% of FY2025 revenue; watch whether service technicians turn discovered problems into approved jobs without scarce crews being pulled elsewhere.These are replacements and improvements too large for a repair visit but smaller than major construction. They supplied 6.2% of FY2025 revenue; watch whether service technicians turn discovered problems into approved jobs without scarce crews being pulled elsewhere.
In plain English
Too large for one repair visit, too contained to remake a building: these jobs replace a large cooling machine, improve controls or renew a section of pipe or wiring. They have a clear start and finish, so they should not be mistaken for monthly repeat income.
Building owners pay after a failure, capacity need, rule change or desire to use less energy. Technicians often spot the need during routine visits, then hand the larger job to a project crew. Winning the work depends on customer approval and access to shut down the affected area.
Competes with Owner Direct Relationships (Limbach Holdings) · Upgrade and Optimization Services (Trane Technologies) · Building Services Projects (EMCOR Group)
Named in filings, launches and programs
- Two Large Data-Center Customer CommitmentsCustomer program · RampingTwo operators of giant computing sites have promised multi-year factory volume; their names and committed amounts remain undisclosed.
- Mechanical SegmentSegmentGroups cooling, plumbing, piping, controls, factory work, monitoring and fire protection; it supplied 73.3% of FY2025 revenue.
- Electrical SegmentSegment · RampingPower-system design, installation, renovation, maintenance and repair, with its share of company sales rising through early 2026.
- Building Automation SystemsServiceInstalls and connects controls that coordinate cooling, heating and other building systems.
- Fire ProtectionServiceDesigns, installs, tests and services the systems that detect or suppress building fires.
- Network ServicesServiceAdds communications wiring and network connections alongside commercial electrical work.
- Industrial RefrigerationServiceInstalls and supports large cooling systems for industrial customers.
- Comfort CARECustomer programOffers levels of planned maintenance up to broader equipment coverage across different brands and customer locations.
- Environmental Air SystemsBrandLeads off-site design and factory assembly of mechanical and data-center systems.
- TAS EnergyBrandBuilds factory-made central utility plants and the power-and-cooling systems used by facilities that cannot afford downtime.
- Summit Industrial ConstructionBrandAdds engineering and direct-hire construction for advanced-technology, power and industrial jobs.
- J&S MechanicalBrandAdds data-center cooling and hospital medical-gas installation capabilities.
- R.C. Hunt ElectricBrandExpands electrical design and construction capacity in the Western United States.
- Feyen ZylstraBrandAdds electrical design, installation and maintenance in the Midwest and South.
- Meisner ElectricBrandExpands electrical construction and renovation in Florida.
- Right Way Plumbing & MechanicalBrandExpands plumbing installation and maintenance in Florida and the Southeast.
- Century ContractorsBrandAdds self-performed mechanical, pipe, steel, equipment and concrete work in the Southeast.
- KodiakEcosystemMoves contract craft workers to large projects where local skilled labor is tight.
- PivotEcosystemAdds another pool of mobile craft workers for project execution.
Two Large Data-Center Customer CommitmentsCustomer program · Ramping
Two operators of giant computing sites have promised multi-year factory volume; their names and committed amounts remain undisclosed.
Mechanical SegmentSegment
Groups cooling, plumbing, piping, controls, factory work, monitoring and fire protection; it supplied 73.3% of FY2025 revenue.
Electrical SegmentSegment · Ramping
Power-system design, installation, renovation, maintenance and repair, with its share of company sales rising through early 2026.
Building Automation SystemsService
Installs and connects controls that coordinate cooling, heating and other building systems.
Fire ProtectionService
Designs, installs, tests and services the systems that detect or suppress building fires.
Network ServicesService
Adds communications wiring and network connections alongside commercial electrical work.
Industrial RefrigerationService
Installs and supports large cooling systems for industrial customers.
Comfort CARECustomer program
Offers levels of planned maintenance up to broader equipment coverage across different brands and customer locations.
Environmental Air SystemsBrand
Leads off-site design and factory assembly of mechanical and data-center systems.
TAS EnergyBrand
Builds factory-made central utility plants and the power-and-cooling systems used by facilities that cannot afford downtime.
Summit Industrial ConstructionBrand
Adds engineering and direct-hire construction for advanced-technology, power and industrial jobs.
J&S MechanicalBrand
Adds data-center cooling and hospital medical-gas installation capabilities.
R.C. Hunt ElectricBrand
Expands electrical design and construction capacity in the Western United States.
Feyen ZylstraBrand
Adds electrical design, installation and maintenance in the Midwest and South.
Meisner ElectricBrand
Expands electrical construction and renovation in Florida.
Right Way Plumbing & MechanicalBrand
Expands plumbing installation and maintenance in Florida and the Southeast.
Century ContractorsBrand
Adds self-performed mechanical, pipe, steel, equipment and concrete work in the Southeast.
KodiakEcosystem
Moves contract craft workers to large projects where local skilled labor is tight.
PivotEcosystem
Adds another pool of mobile craft workers for project execution.