ACSI Mechanical Group
ACSI Mechanical Group is a privately held, family-owned industrial mechanical contractor founded in 1984 in Mokena, Illinois, providing 24/7 boiler, burner, HVAC, piping, and refractory services to hospitals, manufacturers, and commercial facilities across the Midwest.
- Company typePrivate
- Founded1984
- HeadquartersMokena, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What ACSI Mechanical Group does
ACSI Mechanical Group, legally American Combustion Service, Inc., is a privately held industrial mechanical services contractor founded in December 1984 by Frank M. Lacny and headquartered in Mokena, Illinois. The company specializes in the service, installation, and emergency repair of industrial HVAC, boiler, burner, and piping systems, with an additional refractory division serving high-temperature industrial applications such as ovens, furnaces, thermal oxidizers, and melting furnaces. Its core technical capabilities rest on ASME-authorized boiler and pressure vessel credentials (including R Stamp repair certification), Local 597 Pipefitters Union labor access, and a proprietary energy analysis methodology that quantifies boiler efficiency improvements and routes qualifying projects to utility rebate programs. ACSI has recovered over $1 million in rebates for clients across its utility Trade Ally relationships with ComEd, Nicor Gas, Peoples Gas, Northshore Gas, and Ameren.
ACSI operates five integrated divisions — service, mechanical/piping, refractory, boiler service and repair (via the American Boiler & Tank Repair partnership), and equipment sales — generating revenue primarily through professional services (emergency repair, installation, refractory work), recurring preventive maintenance contracts (including the Multi-Point Maintenance Program), and hardware sales of new and used boilers, burners, and HVAC units. Customer concentration sits in Midwestern industrial and commercial facilities — hospitals, food and industrial manufacturers, universities, and commercial buildings — served by approximately 25 employees via direct field service. Geographic reach is anchored in the Chicago metropolitan area and Midwest (Wisconsin, Iowa, Indiana, southern Illinois), with project work extending opportunistically to New Jersey, Mexico, and Alaska.
The go-to-market model is relationship-driven enterprise field sales, supported by a content marketing program (website, whitepapers, monthly newsletter) and earned media in regional trade publications. Pricing is quote-based and project-specific; complimentary energy assessments and free refractory inspections are used as top-of-funnel conversion tools. The firm is founder- and family-controlled (Erik Lacny serves as Vice President) with no external investors, M&A activity, or public capital markets presence.
ACSI Mechanical Group firmographics
Firmographics- Name
- ACSI Mechanical Group
- Legal name
- American Combustion Service, Inc.
- Website
- https://acsigroup.com
- Company type
- Private
- Founded year
- 1984
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- ACSI Mechanical Group is a privately held, family-owned industrial mechanical contractor founded in 1984 in Mokena, Illinois, providing 24/7 boiler, burner, HVAC, piping, and refractory services to hospitals, manufacturers, and commercial facilities across the Midwest.
- Ownership category
- akta.pro rank
ACSI Mechanical Group industry classification
Industry- Product category
- Industrial Mechanical Services
- NAICS
- Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance (8113), Heating Equipment (except Warm Air Furnaces) Manufacturing (333414), Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (3334)
- SIC
- Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Heating Equipment, Except Electric & Warm Air Furnaces (3433), Refrigeration & Service Industry Machinery (3580)
- akta.pro primary industry
- HVAC & Refrigeration Contracting (IMAFALAB)
- akta.pro secondary industries
- Emergency HVAC Repair (24/7) (HSAOAHAC), Commercial HVAC Maintenance Agreements & PM Programs (HSAOAHAJ), HVAC Equipment (Heating, Cooling & Air Handling) (IMAHAKAB)
Keywords
Where ACSI Mechanical Group is headquartered
LocationHeadquarters
- HQ city
- Mokena
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
ACSI Mechanical Group business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Supply Chain, Infrastructure, Marketing or Sales
Revenue model
- Service and Repair: 24/7 emergency repair services for industrial piping, boilers, burners, and critical mechanical systems. Includes furnace, boiler, and HVAC services.
- Installation Services: Installation of new boilers, burners, economizers, high-temperature furnaces, kilns, chillers, and piping systems.
- Maintenance Programs: Preventive maintenance programs including seasonal inspections, filter changes, system cleaning, performance testing, and the ACSI Multi-Point Maintenance Program.
- Equipment Sales: Sales of new and used boilers, burners, high-temperature furnaces, and HVAC units, as well as parts and components.
- Refractory Services: Specialized combustion refractory products and services for industrial applications, including repairs, installations, and inspections.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Pay-as-you-go | Complimentary energy assessments |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels5 records
ACSI Mechanical Group product offering
Product offeringCore offering
ACSI Mechanical Group provides industrial and commercial mechanical services focused on boilers, burners, piping, refractory, and HVAC systems. Offerings include 24/7 emergency repair, preventive maintenance programs, new equipment installation, high-efficiency burner upgrades, ASME-authorized pressure vessel repair, and sales of new and used boilers, burners, and high-temperature furnaces. The company serves hospitals, manufacturers, food processors, and commercial buildings primarily in the Chicago metropolitan area and Midwest.
Product overview
ACSI Mechanical Group offers a comprehensive suite of industrial mechanical services organized into three main divisions: Service (24-hour emergency repairs for boilers, burners, and HVAC), Mechanical/Piping (installation and fabrication), and Refractory (combustion-related products and repairs). The company also provides specialized equipment sales and energy analysis services. Services include boiler repairs and installations, high-efficiency burner upgrades, commercial HVAC design/installation/maintenance, refractory repairs, steam trap surveys, and tank/pressure vessel repairs. The portfolio is designed to serve industrial facilities requiring continuous operation, with 24/7 emergency response capabilities and complementary energy assessments to identify efficiency improvements.
Differentiator
Problem solved
Functional benefit
Products and services
- Service Division (Furnace, Boiler, and HVAC Service) 24-hour emergency repair and routine service for commercial and industrial furnaces, boilers, burners, and HVAC systems. Includes combustion system services and burner tune-ups for industrial and commercial facility operators.
- Mechanical/Piping Division Full-service mechanical management and piping installation for steam, gas, oil, chilled water, hot water, and process piping systems using black, galvanized, copper, and stainless steel pipes. Includes in-house fabrication and 24-hour emergency piping and mechanical repairs.
- Refractory Division Specialized combustion refractory products and services provided nationwide. Includes repairs, new installations, and point-and-paint maintenance for boilers, ovens, furnaces, kilns, thermal oxidizers, and melting furnaces used in steel, aluminum, commercial baking, and food manufacturing.
- Boiler Service and Repair (American Boiler & Tank Repair) ASME-authorized boiler and pressure vessel repair services including retubing, patch welding, high-efficiency burner upgrades, boiler descaling, and installations. Backed by all required ASME BPVC Certificates and Stamps, including R Stamp (REPAIR) welding certifications.
- Equipment Sales Sales of new and used boilers, burners, high-temperature furnaces, and HVAC units for commercial and industrial applications, including related parts and components.
- Commercial and Industrial HVAC Services Comprehensive HVAC solutions for commercial and industrial customers, including system design, installation, preventive maintenance, heating and cooling service, ventilation, emergency repair, and system upgrades/retrofits.
- ACSI Multi-Point Maintenance Program Subscription-style preventive maintenance program that delivers seasonal inspections, filter changes, system cleaning, and performance testing to maximize HVAC system efficiency and lifespan for commercial and industrial customers.
- Energy Saving Burner Analysis Complimentary onsite energy assessment that analyzes boiler and burner efficiency, typically delivering 6% savings in addition to fuel savings. Includes a detailed report with recommendations on tune-up schedules and programmable thermostats.
- Steam Trap Surveys Professional steam trap testing and inspection using thermal imaging and electronic ultrasound to locate faulty traps and quantify steam losses for industrial customers.
- Instrumentation Calibration Services Calibration services for new electronic and legacy pneumatic boiler controls, instrumentation, and flame safety control upgrades for industrial and commercial boiler systems.
Quantifiable outcome
- Boiler efficiency improved from 69-76% to 80-85% after high-efficiency burner installation
- +4 more outcomes
Companies that use ACSI Mechanical Group
Customer profileNamed customers16 records
Segments3 records
Ideal customer profiles2 records
ACSI Mechanical Group technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
ACSI Mechanical Group partnerships and signals
Strategic signalPartnerships
Seven partnerships are on record, tiered core and minor.
- ComEd (Commonwealth Edison)coreACSI partners with ComEd through their AirCare Plus Program, offering free A/C inspections and tune-ups for customers with packaged rooftop units over three tons capacity. ACSI technicians received training through this program to provide diagnostic services and efficiency improvements.
- Nicor GascoreACSI is a Trade Ally of Nicor Gas, helping clients access energy efficiency rebates through the Small Business Energy Savings program. Assists with application paperwork to help clients qualify for maximum rebates.
- Peoples GascoreACSI is a Trade Ally of Peoples Gas, enabling clients to receive rebates of up to $235,770+ for high-efficiency burner installations. Helps clients navigate application process for Natural Gas Saving Program.
- Northshore GascoreACSI is a Trade Ally of Northshore Gas, helping commercial and industrial clients access energy efficiency rebates through utility incentive programs.
- AmerencoreACSI is a Trade Ally of Ameren, assisting clients with energy efficiency projects that qualify for utility company rebates and incentive funding.
- Independent Energy ProviderminorACSI has partnered with an independent energy provider who can fund high-efficiency energy projects, with repayment through utility bills, helping clients overcome upfront capital barriers.
- American Boiler & Tank RepaircorePartnership added to provide full suite of ASME-authorized boiler and pressure vessel repairs, expanding ACSI's service capabilities to include retubing, patch welding, and high-efficiency burner upgrades.
Scale indicators6 records
Recent moves6 records
Expansion highlights4 records
ACSI Mechanical Group competitors and assessment
Company assessmentBroad incumbents
- EMCOR Group: Large publicly traded mechanical and electrical construction services firm with significant industrial, commercial, and institutional presence. Overlaps ACSI on boiler, mechanical, and HVAC services but at much greater scale and breadth.
- APi Group: Public safety, specialty, and industrial services conglomerate that includes mechanical contracting and HVAC service capabilities. Competes with ACSI in industrial mechanical services through subsidiary operations.
Direct peers
- Limbach Holdings: Public mechanical services firm specializing in HVAC, plumbing, and building systems for commercial and industrial clients. Directly comparable service portfolio, customer mix, and union contractor model to ACSI Mechanical Group.
- Comfort Systems USA: National mechanical contracting firm focused on HVAC, plumbing, and piping installation and service for industrial and commercial customers. Closest large-cap public comparable in the same core service categories as ACSI.
- AMS Mechanical Services: Mechanical contracting firm offering HVAC, plumbing, and building services to commercial and industrial customers. Closely aligned service mix and customer base with ACSI Mechanical Group.
Regional players
- Hill Mechanical Group: Chicago-area mechanical and HVAC contractor serving commercial and institutional customers. Competes with ACSI for similar Chicago/Midwest industrial and institutional accounts.
Emerging players
- Cleaver-Brooks: Boiler and combustion equipment manufacturer that also offers service and aftermarket support for industrial boiler rooms. Directly comparable in industrial combustion/burner expertise and overlaps ACSI on service and equipment sales.
- Burnham Holdings: Manufacturer of commercial and industrial boilers and combustion equipment with service capabilities. Comparable in boiler/burner hardware and adjacent service work to ACSI's Boiler Service and Equipment Sales divisions.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
ACSI Mechanical Group social profiles
Digital presenceACSI Mechanical Group compliance and trust
Trust signalCompliance2 records
ACSI Mechanical Group financial estimates
Financial estimateRevenue estimate
Valuation estimate
ACSI Mechanical Group leadership team
Management profileNumber of profiles
Profiles3 records
ACSI Mechanical Group funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
ACSI Mechanical Group M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about ACSI Mechanical Group
What does ACSI Mechanical Group do?
ACSI Mechanical Group provides industrial and commercial mechanical services focused on boilers, burners, piping, refractory, and HVAC systems. Offerings include 24/7 emergency repair, preventive maintenance programs, new equipment installation, high-efficiency burner upgrades, ASME-authorized pressure vessel repair, and sales of new and used boilers, burners, and high-temperature furnaces. The company serves hospitals, manufacturers, food processors, and commercial buildings primarily in the Chicago metropolitan area and Midwest.
Is ACSI Mechanical Group a public or private company?
ACSI Mechanical Group is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was ACSI Mechanical Group founded?
ACSI Mechanical Group was founded in 1984. It employs 11 to 50 people.
Where is ACSI Mechanical Group based?
ACSI Mechanical Group is headquartered in Mokena, United States, in the North America region.
How does ACSI Mechanical Group make money?
Five revenue lines are on record. Service and Repair is the primary driver. The others are installation Services, maintenance Programs, equipment Sales and refractory Services.
Who are ACSI Mechanical Group's main competitors?
Broad incumbents on record are EMCOR Group and APi Group. Direct peers are Limbach Holdings, Comfort Systems USA and AMS Mechanical Services. Hill Mechanical Group is listed as a regional player. Emerging players are Cleaver-Brooks and Burnham Holdings.
Does ACSI Mechanical Group have an API?
No public API is recorded for ACSI Mechanical Group.
What industry is ACSI Mechanical Group in?
ACSI Mechanical Group's product category is Industrial Mechanical Services. Its primary akta.pro industry code is IMAFALAB, HVAC & Refrigeration Contracting, with a secondary code of HSAOAHAC, Emergency HVAC Repair (24/7). Its NAICS code is 8113 and its SIC code is 3585.