M&O Insulation Company

What M&O Insulation Company does

M&O Insulation Company is a commercial and industrial mechanical insulation contractor founded in 1972 by Rich O'Heir, now operated as a family-owned business under M&O Holding, LLC with Steve Castellarin (founder's grandson) serving as President. The company delivers mechanical insulation for hot, cold, and refrigeration systems across piping, ductwork, HVAC, and industrial equipment, alongside complementary service lines: custom removable insulation blankets (rated to 1200°F with QR code asset tags), HILTI Accredited fire stopping, and environmental remediation services including asbestos abatement, lead abatement, and 24/7 mold remediation. Operations are organized across three wholly-owned subsidiaries — M&O Midwest (Chicago/Midwest), M&O Atlantic (East Coast, founded 2020), and M&O Environmental (MOE, est. 1987) — with four regional offices in Mokena (HQ), Peoria, Caledonia, and Elkton, and coverage across 30+ U.S. states.

The company is 100% unionized, with all workers trained in OSHA 10- and 30-hour safety courses and approximately 75 certified Foremen holding specialized credentials. M&O serves enterprise customers including Microsoft, Amazon, Google, BP, Caterpillar, Boeing, Johnson & Johnson, Merck, and Kraft, with demonstrated capacity to mobilize 1,000+ insulators for mega-projects (the 2009-2015 BP expansion) and to execute $100M single-project engagements (a 2025 data center build). Revenue is generated through project-based, quote-driven commercial contracts across four primary verticals — data centers, food and refrigeration, industrial manufacturing, and pharmaceuticals — with environmental remediation positioned as a secondary use case. Go-to-market is direct enterprise field sales through regional offices, supported by industry association affiliations (MCA, MICA, IECA, LECET) and relationship-driven repeat business, with the company's 2025 EMR of 0.74 (below industry average) and HILTI Accredited fire stopping certification serving as key safety and quality credentials in a compliance-driven market.

Name

M&O Insulation Company

Legal name

M&O Holding, LLC

Website

https://mocompany.com

Company type

Private

Founded year

1972

Operating status

Operating

Short description

M&O Insulation Company is a 100% union, family-owned commercial and industrial mechanical insulation contractor founded in 1972, serving enterprise clients across data centers, manufacturing, pharmaceuticals, and food processing with insulation, fire stopping, and environmental remediation services.

Ownership category

akta.pro rank

Product category

Mechanical Insulation Contracting

NAICS

Drywall and Insulation Contractors (238310), Plumbing, Heating, and Air-Conditioning Contractors (23822)

akta.pro primary industry

Electrical Heat Tracing & Insulation (EHT, Thermal/Acoustic Insulation) (EUAEAFAI)

akta.pro secondary industries

Duct Sealing, Insulation & Airflow Balancing (HSAOAIAH), Insulation & Air/Vapor Barrier Systems (Thermal, Acoustic, WRB/AVB) (IMAFAMAD)

Keywords

• Commercial mechanical insulation
• Fire stopping services
• Asbestos abatement services
• Lead abatement services
• Mold remediation services

Headquarters

HQ city

Hazel Crest

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Marketing or Sales, Others

Revenue model

1. Commercial Mechanical Insulation Services: Installation of mechanical insulation for commercial and industrial piping, ductwork, and equipment. Revenue is project-based, generated through contracted installation services for commercial buildings, industrial facilities, data centers, and manufacturing plants.
2. Environmental Services: Asbestos abatement, lead abatement, and mold remediation services. Project-based revenue from hazardous material removal and environmental compliance services for commercial and industrial clients.
3. Fire Stopping Services: Passive fire protection systems installation for sealing openings and gaps to prevent fire and smoke spread. Compliance-driven services required by building codes (NEC 2005 Article 300.21).
4. Removable Insulation Blankets: Custom-fabricated thermal blankets sold as products for mechanical equipment. Provides ongoing revenue through new installations and replacement orders.
5. Data Center Projects: Specialized insulation services for data center facilities. In 2025, completed first $100 million single insulation project for data center.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

M&O Insulation Company is a 100% union, family-owned commercial and industrial mechanical insulation contractor founded in 1972. The company installs mechanical insulation for piping, ductwork, boilers, valves, and HVAC systems; fabricates custom removable insulation blankets; provides HILTI Accredited passive fire stopping; and delivers environmental remediation including asbestos, lead, and mold abatement for enterprise clients across 30+ states.

Product overview

M&O Insulation Company is a commercial and industrial mechanical insulation contractor offering a portfolio of service brands spanning three divisions: M&O Midwest (Midwest region), M&O Atlantic (East Coast), and M&O Environmental. The core offerings include Commercial Mechanical Insulation Services for hot, cold, and refrigeration systems; Removable Insulation Blankets (custom thermal blankets for mechanical equipment); Fire Stopping (passive fire protection systems); and Environmental Services including Asbestos Abatement, Lead Abatement, and Mold Remediation. The company operates as 100% union and family-owned, serving 30+ states primarily in the Midwest and Mid-Atlantic regions. The sub-brands function as related service lines under unified company ownership, with M&O Environmental operating as a separate but affiliated entity focused on hazardous material remediation and re-insulation.

Differentiator

Problem solved

Functional benefit

Brands

• M&O Midwest: Industrial and commercial insulation installation, fire-stopping technologies, and custom removable blankets serving the Chicago area leveraging manufacturing heritage
• M&O Environmental (MOE)
• M&O Atlantic

Products and services

• Commercial Mechanical Insulation Installation of mechanical insulation for hot, cold, and refrigeration systems covering piping, ductwork, valves, plumbing, HVAC systems, and boilers in commercial and industrial facilities. Designed to control surface temperatures, eliminate energy waste, prevent condensation, and protect worker safety.
• Removable Insulation Blankets Custom multi-layered thermal blankets engineered to fit pipes, boilers, valves, steam traps, flanges, and other mechanical equipment. Withstand temperatures up to 1200°F, allow easy removal for maintenance, and feature QR code tags for asset management tracking.
• Fire Stopping Passive fire protection systems that seal openings and gaps in partitions to prevent lateral and vertical fire and smoke spread through buildings. Compliant with NEC 2005 Article 300.21 and International Building Code standards. Delivered under HILTI Accreditation (held by only 120 companies nationwide).
• Environmental Services Comprehensive environmental safety and compliance services including lead abatement, asbestos abatement, and 24/7 mold remediation. Encompasses assessment, planning, containment, removal, and final clearance testing for commercial and industrial facilities.
• Asbestos Abatement Complete removal, secure encapsulation, and expert repair of asbestos-containing materials executed within controlled environments. Includes dual-certified supervisory teams cross-trained in asbestos removal and re-insulation for seamless remove-and-replace projects, in compliance with OSHA and EPA regulations.
• Lead Abatement Specialized lead-based coating removal requiring proper equipment, meticulous planning, and strict adherence to EPA guidelines. Protects worker health and surrounding environment through comprehensive containment strategies.
• Mold Remediation Expert mold damage removal, abatement, cleanup, repair, remediation, and restoration services for commercial properties. Emergency services available 24 hours a day, 7 days a week.

Quantifiable outcome

• Experience Modification Factor (EMR) of 0.74 in 2025 - below industry average indicating superior safety performance
• +3 more outcomes

Named customers28 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eight partnerships are on record, tiered minor and core.

• MCA (Mechanical Contractors Association)minorOthersIndustry trade association affiliation for mechanical contractors providing networking, standards, and industry representation.
• MICA (Mechanical Insulators Association)minorOthersIndustry association for mechanical insulators supporting industry standards, training, and best practices.
• IECA (Illinois Environmental Contractors Association)minorOthersIllinois trade association for environmental contractors. Dan Schuman serves as current Director of IECA.
• LECET (Laborers' International Union)minorOthersUnion partnership representing laborers, teamsters, and insulators supporting the company's 100% union workforce.
• Chief Engineers Association of ChicagolandminorOthersProfessional association of chief engineers. Dan Schuman holds industry affiliations with this organization.
• HILTIcoreTechnology or IntegrationM&O is HILTI Accredited - an elite certification shared by only 120 companies nationwide. Provides access to cutting-edge fire stopping education, industry updates, and safety protocols.
• Local 17 (Insulators Union)coreOthersPrimary union for insulators. The company is 100% union and family owned, with many technicians having come up through apprenticeship from this local.
• Local 42 (Laborers Union)minorOthersLabor union local supporting the company's union workforce.

Scale indicators7 records

Recent moves9 records

Expansion highlights6 records

Broad incumbents

• APi Group: APi Group is a global safety, specialty, and industrial services holding company (NYSE: APG) with subsidiaries in insulation, mechanical services, and life safety. Provides comparable services to M&O through subsidiaries but at substantially larger scale and as part of a diversified portfolio.
• Fluor Corporation: Fluor Corporation is a global engineering, procurement, fabrication, construction, and maintenance company (NYSE: FLR) with industrial insulation and specialty mechanical services through its industrial segment. Overlaps with M&O's industrial insulation work for energy and process customers at substantially larger scale.
• EMCOR Group: EMCOR Group is the largest U.S. provider of mechanical and electrical construction, building services, and industrial services (NYSE: EME), with subsidiaries performing industrial insulation and specialty contracting. Overlaps with M&O's mechanical insulation work as part of a substantially broader portfolio.
• IES Holdings: IES Holdings is a publicly traded provider of electrical and mechanical infrastructure services (NASDAQ: IESC) for industrial, commercial, and data center customers. Comparable to M&O's mechanical services scope for industrial and commercial facilities, with a broader electrical focus.

Direct peers

• Matrix Service Company: Matrix Service Company is a publicly traded engineering, construction, and industrial services contractor (NASDAQ: MTRX) serving energy, process, and industrial markets with insulation and mechanical services. Directly comparable to M&O's industrial insulation and environmental services for energy and process clients.
• Performance Contracting Inc: Performance Contracting (PCI) is one of the largest U.S. mechanical insulation, fireproofing, and firestopping contractors, serving commercial, industrial, and institutional clients. Directly comparable to M&O in core service offering; M&O President Steve Castellarin previously led PCI's Philadelphia market.
• BrandSafway: BrandSafway is the largest mechanical services, insulation, scaffolding, and access solutions provider in North America, serving industrial and commercial customers including energy, refining, and data center projects. Directly comparable to M&O in mechanical insulation scope and customer base, with substantially greater national reach and scale.
• Limbach Holdings: Limbach Holdings is a publicly traded mechanical services contractor (NASDAQ: LMB) providing HVAC, plumbing, and specialty mechanical services for commercial and institutional clients. Comparable to M&O in mechanical services scope, with a broader service portfolio and public-company scale.
• Advanced Specialty Contractors: Advanced Specialty Contractors is a Mid-Atlantic-based mechanical insulation contractor providing commercial and industrial insulation, firestopping, and specialty services. Directly comparable to M&O in scope and East Coast geography; Steve Castellarin served as President before rejoining M&O.

Regional players

• U.S. Engineering: U.S. Engineering is one of the largest privately held mechanical contractors in the central U.S., providing HVAC, plumbing, and specialty mechanical services. Comparable to M&O in mechanical services scope, with a strong regional footprint in the Midwest that overlaps with M&O's territory.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/m-o-companies

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about M&O Insulation Company