NEMSI

What NEMSI does

NEMSI (New England Mechanical Services, Inc.) is a commercial mechanical, electrical, building automation, and facilities services provider serving customers across Connecticut and the broader Northeast United States. Founded around 1965-1966 and headquartered in South Windsor, Connecticut, the company operates from eight branch offices spanning Connecticut, Massachusetts, Maine, Rhode Island, New Hampshire, and New York, supported by a mobile fleet of more than 300 vans and 250+ licensed technicians — described as the largest mobile facilities services fleet in New England. NEMSI delivers single-source facilities solutions through five core service lines: HVAC/mechanical (design-build, repair, replacement, preventive maintenance, boiler, chiller, and energy solutions), building automation with multi-vendor Direct Digital Control (DDC) integration, commercial electrical services, facilities services including on-site operations management, and infrared thermography for predictive electrical maintenance.

The company monetizes through a mix of recurring subscription-based facilities maintenance contracts (Full Service and Full Labor tiers billed annually, plus multi-year custom programs), one-time project revenue from design-build and HVAC replacement work, and professional services fees for emergency response and specialty diagnostics such as infrared scanning. Its go-to-market is enterprise field sales executed through regional branch offices with regional general managers, complemented by EMCOR Group national accounts leverage for multi-location customers. The customer base spans commercial real estate, healthcare, technology/pharmaceutical, education, industrial/manufacturing, and financial services — with named engagements including Hartford 21, ORAFOL Americas, Forstone Capital, Chapel Haven Schleifer Center, and The Bentley Condominium. NEMSI operates as a wholly-owned subsidiary of EMCOR Group, Inc. (NYSE: EME), a Fortune 500 specialty contractor with 80+ operating companies, and benefits from EMCOR's financial backing, EMCOR University training resources, and aggregate safety performance that has run 52% below the Bureau of Labor Statistics industry average for 15 consecutive years.

Name

NEMSI

Legal name

New England Mechanical Services, Inc.

Website

https://nemsi.com

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

101–250 employees

Short description

NEMSI is a Connecticut-based commercial mechanical, electrical, building automation, and facilities services provider — a subsidiary of EMCOR Group — operating across the Northeast US with eight offices, 300+ service vans, and 250+ technicians serving enterprise customers in real estate, healthcare, manufacturing, and education.

Ownership category

akta.pro rank

Product category

Commercial Facilities Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220), Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance (811310)

SIC

Refrigeration & Service Industry Machinery (3580)

akta.pro primary industry

Hard Services (MEP/HVAC, Electrical, Plumbing) (BPABAAAA)

akta.pro secondary industries

Commercial HVAC Maintenance Agreements & PM Programs (HSAOAHAJ), Energy Services (Retrofits/Commissioning/Testing & Balancing) (IMAIABAI), HVAC & Industrial Ventilation (Chillers, AHUs, Exhaust, Filtration) (EUAEAFAE)

Keywords

• Commercial HVAC services
• Building automation systems
• Facilities maintenance
• Mechanical contracting
• Energy efficiency solutions

Headquarters

HQ city

Windsor

HQ country

United States

HQ region

North America

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Facilities Maintenance Contracts: Preventive maintenance programs and service agreements for commercial HVAC, electrical, plumbing, and building automation systems. Includes full-service, full-labor, and custom facilities programs.
2. HVAC Design/Build Services: Design-build and design-assist services for commercial HVAC, mechanical, and electrical systems including complete engineering services and project management.
3. Infrared Thermography Services: Electrical maintenance services using thermal imaging technology for predictive maintenance and compliance with ANSI/NFPA 70B standards.
4. Emergency Repair Services: 24/7 emergency response services for HVAC, mechanical, and electrical systems with rapid dispatch from strategically located fleet.
5. Commercial HVAC Replacement Projects: Complete commercial HVAC equipment replacement services including boiler, chiller, and RTU upgrades for energy efficiency improvements.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

NEMSI provides single-source commercial mechanical, electrical, building automation, and facilities services for high-performance building environments across Connecticut and the Northeast United States. Offerings span design/build HVAC and mechanical construction, commercial HVAC service and preventive maintenance, repair and replacement, chiller and boiler services, building automation integration with Direct Digital Controls, commercial electrical services, mobile facilities services supported by a 300+ van fleet, and energy-efficiency solutions including audits and utility incentive procurement. Customers include commercial real estate, healthcare, technology/pharmaceutical, education, industrial/manufacturing, and financial services organizations served through 8 branch offices in CT, MA, ME, RI, NY, and NH.

Product overview

NEMSI is a facilities services company offering single-source mechanical and facilities solutions for commercial environments. The company operates as a unified service portfolio rather than a software platform, combining building automation, HVAC/mechanical services, electrical services, facilities services, and specialized offerings including infrared thermography, chiller services, and boiler services. Services are delivered through design/build, repair/replacement, preventive maintenance, and energy solutions modules that work together to provide end-to-end facilities management for commercial real estate, financial, healthcare, technology, educational, and industrial facilities across Connecticut and the Northeast.

Differentiator

Problem solved

Functional benefit

Products and services

• Building Automation
• HVAC / Mechanical Services
• Electrical Services
• Facilities Services
• HVAC Design/Build
• HVAC Repair & Replacement
• HVAC Service & Preventive Maintenance
• HVAC Energy Solutions
• Boiler Services
• Chiller Services
• Infrared Thermography

Quantifiable outcome

• $1M in annual energy savings for Hartford 21 project
• +4 more outcomes

Named customers5 records

Segments6 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

Scale indicators11 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Limbach Holdings: Limbach Holdings (NASDAQ: LMB) is a specialty contractor providing HVAC, mechanical, electrical, plumbing, and building automation services to commercial and institutional customers. Directly comparable to NEMSI in service mix, customer verticals, and design-build/maintenance business model, though Limbach operates nationally while NEMSI is Northeast-focused.
• Comfort Systems USA: Comfort Systems USA (NYSE: FIX) is one of the largest mechanical and electrical contractors in the US, providing HVAC, plumbing, and building automation services to commercial and industrial customers. Directly comparable in core mechanical contracting services, with multi-region subsidiary structure similar to EMCOR's model.
• IES Holdings: IES Holdings (NASDAQ: IESC) provides electrical and mechanical infrastructure services to commercial, industrial, and institutional customers, including design, installation, and maintenance. Direct peer in MEP services with overlapping customer segments in commercial real estate, healthcare, and data centers.
• APi Group: APi Group (NYSE: APG) is a global provider of safety, specialty, and industrial services with a similar holding-company model to EMCOR. Comparable in services-led business model and acquisition-driven growth strategy, though APi focuses more on fire/life safety and specialty services than mechanical contracting.

Broad incumbents

• EMCOR Group: EMCOR Group (NYSE: EME) is the publicly-traded parent of NEMSI and the parent of 80+ mechanical and electrical contracting subsidiaries. As the parent, it provides the financial backing, training, and national accounts platform that supports NEMSI, while also being its most direct corporate peer in services scope and scale.
• Trane Technologies: Trane Technologies (NYSE: TT) is a global climate solutions manufacturer and services provider offering HVAC equipment, building automation, and energy services. Overlaps with NEMSI in commercial HVAC service and building automation, though Trane primarily manufactures equipment while NEMSI installs and services multi-vendor systems.
• Johnson Controls International: Johnson Controls (NYSE: JCI) is a global building technologies company providing HVAC equipment, building automation systems (Metasys), and integrated facility services. Directly comparable in building automation and HVAC services, but with much larger scale, proprietary technology stack, and global footprint.
• Carrier Global: Carrier Global (NYSE: CARR) is a major HVAC and building solutions manufacturer with growing services and digital offerings. Comparable to NEMSI in commercial HVAC service and controls integration, though Carrier primarily manufactures equipment and operates at much larger scale.
• ABM Industries: ABM Industries (NYSE: ABM) is a leading provider of integrated facility services including HVAC, mechanical, electrical, janitorial, and parking services. Comparable in facility services scope, though ABM is more diversified across soft and hard services with a national footprint, and NEMSI specializes deeper in mechanical/HVAC within a regional footprint.
• SPX Technologies: SPX Technologies (NYSE: SPXC) provides heating, ventilation, and air conditioning (HVAC) products and detection/measurement solutions. Overlaps with NEMSI in commercial HVAC and building services equipment, though SPX is more equipment/manufacturer-focused while NEMSI focuses on installation, service, and integrated facilities solutions.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/user/EMCORgroup
• Facebookfacebook.com/emcorgroupinc
• LinkedInlinkedin.com/company/emcor-services-new-england-mechanical-nemsi-
• Instagraminstagram.com/emcor_group_inc
• Xx.com/nemsiaspect

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles14 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 NEMSI