Donnelly Mechanical Corporation

What Donnelly Mechanical Corporation does

Donnelly Mechanical Corporation is a New York City-based commercial HVAC mechanical contractor founded in 1989, providing installation, preventive maintenance, 24/7 emergency repair, construction, and indoor air quality services to commercial real estate, healthcare, financial, technology, and institutional clients across the NYC metropolitan area (NYC, Westchester, Long Island, Northern New Jersey). Its core technology stack centers on commercial HVAC systems including chillers, boilers, air handlers, rooftop units, VRF/VRV systems, and building automation controls, supplemented by BIM and 3D virtual scanning for multi-trade coordination, an online client portal for service management, and a proprietary NYC zoning dispatch system supported by 100+ vehicles and 30+ on-foot technicians.

The company's revenue model is anchored by recurring preventive maintenance and multi-site service contracts (subscription), supplemented by professional services revenue from 24/7 repair, turn-key equipment replacements, new construction and retrofits, and increasingly by add-on revenue lines including Indoor Air Quality certification (launched March 2022 with Indoor Science), systems analysis and commissioning, NYC regulatory compliance (Local Laws 77, 87, 97, 159), and on-bill equipment financing through parent Equans with 36-84 month terms and up to 24-month deferrals. Go-to-market is direct enterprise field sales targeting building owners and property managers, supported by case studies and testimonials from landmark NYC clients such as BlackRock, Boston Properties, Silverstein Properties, Meta (Farley Building, $16.6M), MTA (LIRR snow melt, $15.4M), IBM (Flatiron, $7.3M), and Northwell Health.

Since July 2021, Donnelly has operated as an indirect wholly-owned subsidiary of Equans U.S. (itself part of Bouygues S.A. since October 2022), retaining independent operating status within NYC while accessing parent financing, prefabrication capabilities (sister company Systecon), and global procurement. The company employs approximately 200 people, including 100+ field technicians and 30+ stationary engineers, many unionized through Local Union 63 and Steamfitters Local 638, with 55+ employees in its 10 Year Club and an EMR of .66.

Name

Donnelly Mechanical Corporation

Legal name

Donnelly Mechanical Corp.

Website

https://donnellymech.com

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

101–250 employees

Short description

Donnelly Mechanical Corporation is a New York City-based commercial HVAC mechanical contractor providing installation, preventive maintenance, 24/7 repair, construction, and indoor air quality services to enterprise real estate, healthcare, financial, technology, and institutional clients across the NYC metro area.

Ownership category

akta.pro rank

Headquarters

HQ city

Queens Village

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Preventive Maintenance Contracts: Customized HVAC preventive maintenance agreements for commercial buildings providing peak operating efficiency, minimized downtime, and elimination of repeat service calls. Includes 24/7 emergency support and priority response.
2. 24/7 Service and Repair: Emergency HVAC repair service available 24/7 with rapid response throughout NYC. Factory trained technicians responding via van or on-foot using unique NYC zoning system.
3. HVAC Construction and Renovations: New HVAC construction, renovations, and retrofits for commercial and industrial facilities. Supports fast-track, design-build, or plan-and-spec delivery methods.
4. Turn-Key Equipment Replacements: Special Projects division providing turn-key equipment replacements and high-efficiency system upgrades including chillers, air handlers, and complete system retrofits.
5. Multi-Site Service Contracts: Comprehensive all-inclusive HVAC service contracts for organizations with multiple locations across NYC and Metro New York. Single fixed annual price covering scheduled maintenance and reactive repairs.
6. Equipment Financing: On-bill financing through Equans for high-efficiency mechanical and electrical upgrades. Adaptable contract terms of 36 to 84 months with deferred payment options up to 24 months.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels6 records

Core offering

Donnelly Mechanical Corporation is a New York City-based commercial HVAC mechanical contractor providing installation, preventive maintenance, 24/7 emergency repair, construction, retrofits, indoor air quality assessment, and regulatory compliance services (Local Law 77/87/97/159) to Class-A commercial buildings. The company serves 1,700+ commercial clients across NYC, Westchester, Long Island and Northern New Jersey using a fleet of 100+ vehicles, 30+ on-foot technicians, and a strategic Manhattan zoning system for rapid response.

Product overview

Donnelly Mechanical Corporation provides a comprehensive portfolio of commercial HVAC services across the New York City metro area. The core offering consists of installation and upgrades, preventive maintenance, 24/7 emergency repair, building engineering services, and indoor air quality solutions. These services are delivered through multiple channels including turn-key equipment replacements, multi-site service contracts, construction and renovations, systems analysis and commissioning, and NYC regulatory compliance services (Local Law 77/87/97/159). The company also offers financing options backed by parent company EQUANS and provides a client portal for service management. The product portfolio is designed to serve NYC's most prominent commercial organizations including Class-A office buildings, data centers, healthcare facilities, financial institutions, and educational institutions.

Differentiator

Problem solved

Functional benefit

Products and services

• Commercial HVAC Preventive Maintenance Customized HVAC preventive maintenance agreements for distinguished commercial buildings including comprehensive equipment assessment, 24/7 emergency support, account-dedicated technicians, and online client portal access. Designed for Class-A office buildings, healthcare facilities, data centers and other commercial organizations in NYC.
• 24/7 Service and Repair Round-the-clock emergency HVAC repair service with rapid response throughout NYC, using a strategic zoning system, fleet of 100+ vehicles, and 30+ on-foot technicians. Factory-trained technicians respond via van or on foot for quick emergency resolution.
• Commercial HVAC Installation & Upgrades Full-service HVAC installation, turn-key equipment replacements, refrigerant conversions, and high-efficiency system upgrades including piping, ductwork, and control enhancements for commercial facilities.
• Commercial HVAC Construction & Renovations New HVAC construction, renovations, and retrofits for commercial and industrial facilities using fast-track, design-build, or plan-and-spec delivery methods, with BIM and 3-D virtual scanning for multi-trade coordination.
• Building Engineering Services 24/7 engineering staffing for NYC facilities including preventive maintenance, repair, operating services, system reporting/diagnostics, emergency response, and electrical, mechanical, and plumbing repairs.
• Multi-Site Service Contracts Comprehensive all-inclusive HVAC service contracts for organizations with multiple locations across NYC and Metro New York, providing budget certainty, preventive maintenance, on-demand repair, priority response, system optimization, and 24/7 emergency service under a single fixed annual price agreement.
• Indoor Air Quality Assessment & Certification Professional IAQ testing and certification service in partnership with Indoor Science, including mold/moisture testing, TVOC/CO/NO2/ozone monitoring, particulate matter analysis, ventilation studies, and certificate of testing plaque delivered in as little as 2 weeks.
• Systems Analysis and Commissioning Expert HVAC system analysis and commissioning including post-construction commissioning, re-commissioning, Local Law 87 compliance, recurring issue resolution, and complete indoor air quality testing to WELL building standards.
• NYC Cooling Tower Registration & Compliance Complete cooling tower services ensuring compliance with NYC Local Law 77 and Local Law 159, including Maintenance Program Plan development, inspections, cleaning, Legionella testing, and annual certification.
• Local Law 97 Compliance Services Carbon reduction and energy performance compliance services for NYC buildings over 25,000 sq. ft., including strategy development, emissions tracking, and HVAC system optimization to meet carbon caps and avoid fines.
• Commercial HVAC Financing On-bill financing solution backed by Equans enabling customers to invest in high-efficiency mechanical and electrical upgrades without upfront capital expenditure, with adaptable contract terms of 36 to 84 months and deferred payment options up to 24 months.
• Indoor Air Quality Solutions Comprehensive IAQ services including testing for 30+ health hazards, continuous monitoring with sensor networks, and corrective actions such as Blue Box coil treatment, MERV 13 filtration, UVGI, bi-polar ionization, and advanced oxidation.

Quantifiable outcome

• EMR of .66, well below industry average, demonstrating superior safety performance
• +2 more outcomes

Named customers14 records

Segments8 records

Ideal customer profiles6 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature5 records

Partnerships

Three partnerships are on record, tiered core and minor.

• Indoor SciencecoreStrategic or Co-development Partner · 1 March 2022Partnership for Indoor Air Quality Assessment & Certification services. Donnelly's IAQ certification program uses Indoor Science's scientific grade instruments, lab testing, and expertise for comprehensive indoor environmental quality assessments including mold analysis, TVOC testing, particulate matter monitoring, and ventilation studies. The partnership enables plaque certification in as little as 2 weeks.
• SysteconcoreStrategic or Co-development PartnerSystecon is a sister company within the Equans group and leading modular utility solutions provider. For the Northwell South Shore Hospital project, Donnelly collaborated with Systecon for the prefabricated central utility plant (CUP) manufactured in Ohio, which includes four 6000 MBTU duel fuel boilers, three 500 Ton chillers, heat exchangers, and 5 Marley cooling towers.
• L&K PartnersminorStrategic or Co-development PartnerL&K Partners is the general contractor that hired Donnelly Mechanical for the IBM headquarters installation of 300 Dedicated Outdoor Air Systems (DOAS) units in Manhattan's Flatiron District.

Scale indicators8 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• ABM Industries: Major facility services provider offering HVAC maintenance, mechanical services, and building engineering staffing — overlaps with Donnelly's building engineering services and preventive maintenance lines but operates a much broader integrated facilities management portfolio.
• APi Group: Global provider of safety, specialty, and industrial services with growing commercial mechanical and HVAC service exposure through acquired platforms — operates broader portfolio of services beyond mechanical contracting but overlaps meaningfully in commercial HVAC.
• Johnson Controls: Global building technologies and HVAC equipment manufacturer with a large HVAC service and controls business — provides competing building automation and HVAC service capabilities at scale across enterprise customers, though anchored in equipment manufacturing.

Direct peers

• EMCOR Group: Largest publicly traded U.S. mechanical and electrical construction services firm, providing HVAC, plumbing, electrical, and building services to commercial, industrial, and institutional clients nationwide — directly comparable in core commercial HVAC installation and service model.
• Comfort Systems USA: National commercial HVAC mechanical contractor providing installation, renovation, maintenance, and repair services to commercial and industrial customers — the closest publicly traded pure-play peer to Donnelly's core business model.
• Limbach Holdings: Specialty mechanical contractor focused on HVAC, plumbing, and building controls for commercial and institutional customers, with growing facility services and maintenance contracts — directly comparable in mix of installation, maintenance, and design-build mechanical work.
• IES Holdings: Provider of electrical and mechanical infrastructure services for commercial, industrial, and residential markets, including HVAC design, installation, and service — comparable in delivering multi-trade commercial mechanical scopes to enterprise customers.
• Southland Industries: Large U.S. commercial mechanical contractor providing HVAC, plumbing, and controls design-build and service across major U.S. markets — comparable enterprise-focused commercial mechanical platform with similar design-build, BIM, and recurring service mix.

Others

• Carrier Global: Leading HVAC and refrigeration equipment manufacturer and a key supplier of chillers, air handlers, and controls that Donnelly installs — adjacent rather than directly competitive, but increasingly offering service and replacement capabilities that could encroach on Donnelly's territory.
• Trane Technologies: Global HVAC equipment manufacturer whose chillers, rooftop units, and VRF systems Donnelly installs and services — adjacent as an OEM supplier, with growing service network that competes for high-end commercial HVAC service contracts in major markets.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights8 records

Customer concentration

• Xx.com/donnellymech
• Facebookfacebook.com/donnellymechanical
• LinkedInlinkedin.com/company/donnellymechanical

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 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 Donnelly Mechanical Corporation