Mountain Air Systems

What Mountain Air Systems does

Mountain Air Systems, Inc. is a privately held, second-generation family-owned full-service HVAC mechanical contractor headquartered at 430 Commerce Street, Suite 220 in Williston, Vermont. Founded in 1985 by Jack and Dede O'Farrell and now led by President Liam O'Farrell (a Vermont-licensed Professional Engineer), the company designs, installs, services, and performs preventative maintenance on custom commercial HVAC and mechanical systems, and operates a Specialty Welding Division providing certified welding in carbon steel, stainless steel, aluminum, and medical/high-pressure gas piping for food, dairy, pharmaceutical, and beverage customers nationwide. The company serves commercial and institutional customers across Vermont, parts of New Hampshire, and New York, with named institutional anchors including the University of Vermont, Middlebury College, Tech Vault (data center), Switchback Brewery, PBM Nutritionals, Swan Valley Cheese, Champlain Water District, and ICV Lebanon. Headcount is reported in the 11–50 range and the company has no disclosed private equity or venture capital involvement.

The company executes projects using a 3D CAD design workflow that coordinates system installations with architects, engineers, and trades, and operates an in-house installation and fabrication shop equipped with overhead crane, band saw, ironworker, tube bender, and orbital welder. Its field service operation uses mobile technology to give technicians access to equipment records and service history in the field, supporting guaranteed, fixed-cost Preventative Maintenance Agreements that lock in long-term service revenue. Notable technical work includes a high-efficiency water-cooled chiller plant with N+1 redundancy and water-side economizer for Tech Vault's South Burlington, VT data center, which received LEED Silver Certification, and a 20,000 CFM 100% outside air heat recovery ventilation system for ICV Lebanon's 56,000 sq. ft. lab facility.

Revenue is generated primarily through project-based professional services (engineering/design, installation, and specialty welding) supplemented by recurring preventative maintenance agreements on systems the company has installed or qualified third-party systems. The go-to-market motion is direct, enterprise field sales targeting building owners, facility managers, and institutional buyers, supported by a website portfolio that showcases completed projects as the primary marketing asset. Pricing is not publicly disclosed and is determined through consultation; preventative maintenance is offered on a fixed-cost basis to enable consistent customer budgeting. The company relies on union-affiliated skilled labor (Local 693 Plumbers and Pipefitters) and certified welding credentials as the operational backbone of its service delivery.

Name

Mountain Air Systems

Legal name

Mountain Air Systems, Inc.

Website

https://masvt.com

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

11–50 employees

Short description

Mountain Air Systems is a second-generation, family-owned full-service HVAC mechanical contractor in Williston, Vermont, designing, installing, and servicing custom commercial HVAC and mechanical systems under guaranteed preventative maintenance agreements for institutional and enterprise customers across Vermont, New Hampshire, and New York.

Ownership category

akta.pro rank

Product category

Commercial HVAC & Mechanical Contracting

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)

akta.pro primary industry

HVAC Equipment (Heating, Cooling & Air Handling) (IMAHAKAB)

akta.pro secondary industry

Cold Room Panels, Doors & Seals Repair (HSAOAJAK)

Keywords

• Commercial HVAC services
• Mechanical contracting
• Preventative maintenance
• Specialty welding fabrication
• HVAC system design

Headquarters

HQ city

Williston

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Custom HVAC and Mechanical System Design: Engineering and design services for custom commercial HVAC and mechanical systems for commercial and institutional buildings.
2. Installation Services: Installation of mechanical systems including piping, equipment, and specialty welding for commercial projects.
3. Preventative Maintenance Agreements: Guaranteed preventative maintenance agreements providing fixed-cost servicing of mechanical systems for long-term customer relationships.
4. Specialty Welding and Metal Fabrication: Custom metal fabrication and specialty welding services for food, dairy, pharmaceutical industries, including stainless steel work nationwide.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Mountain Air Systems is a full-service HVAC mechanical contractor that designs, installs, and services custom commercial HVAC and mechanical systems for building owners in Vermont, New Hampshire, and New York. Their offerings are backed by guaranteed preventative maintenance agreements, and the company also operates a specialty welding and metal fabrication division serving food, dairy, pharmaceutical, and beverage industries.

Product overview

Mountain Air Systems is a full-service HVAC mechanical contractor offering a unified portfolio of services: Custom Commercial HVAC & Mechanical System Design (using 3D CAD technology), Installation Division (with in-house welding and metal fabrication shops), Preventative Maintenance Agreements (guaranteed service with mobile technology), and Specialty Welding Division (certified welding for food/dairy/pharmaceutical industries). The company serves Vermont, New Hampshire, and New York, focusing on long-term efficiency, reliability, and energy-conscious design including LEED certification. Their Project Portfolio demonstrates diverse applications from data centers to breweries to educational institutions.

Differentiator

Problem solved

Functional benefit

Products and services

• Custom Commercial HVAC & Mechanical System Design

Quantifiable outcome

• Tech Vault received LEED Silver Certification
• +3 more outcomes

Named customers8 records

Segments4 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 indicators3 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• IES Holdings: IES Holdings is a publicly traded mechanical and electrical contractor delivering HVAC, plumbing, and building services to commercial and industrial customers. Its integrated service model and contract-based relationships directly parallel Mountain Air Systems' design, installation, and service structure.
• Service Logic: Service Logic is a private national provider of commercial HVAC, mechanical, and plumbing services. It focuses on commercial customers with recurring maintenance contracts, similar to Mountain Air Systems' preventative maintenance agreement model.
• Limbach Holdings: Limbach Holdings is a publicly traded mechanical contractor providing HVAC, plumbing, and specialty services to commercial and institutional clients. Its focus on integrated design, fabrication, and service in mission-critical facilities closely parallels Mountain Air Systems' full-service model.

Broad incumbents

• APi Group: APi Group is a global provider of safety, specialty, and industrial services with significant HVAC and mechanical service exposure. Its scale and broad service portfolio overlap with Mountain Air Systems' commercial and institutional HVAC capabilities.
• Comfort Systems USA: Comfort Systems USA is a national mechanical contractor delivering HVAC, plumbing, and building automation services to commercial and industrial customers. Operating model of design-build-service closely mirrors Mountain Air Systems' integrated approach but across many more geographies.
• EMCOR Group: EMCOR Group is one of the largest mechanical and electrical construction, facilities, and energy services firms in the U.S., providing HVAC installation and service across commercial and institutional customers — directly comparable to Mountain Air Systems' design, install, and service offering but at national scale.

Regional players

• HB Mechanical Group: HB Mechanical is a regional commercial HVAC and mechanical contractor serving the Northeast U.S. from offices in the mid-Atlantic. Comparable scope of design, installation, and service work focused on commercial and institutional clients, with overlapping geographic reach into New York.
• Peterson Mechanical: Peterson Mechanical is a regional commercial HVAC and plumbing contractor serving education, healthcare, and industrial customers in the Northeast. Overlapping customer segments (colleges, commercial facilities) and service capabilities make it comparable to Mountain Air Systems.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/mountain-air-systems

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 Mountain Air Systems