What Wiegmann Associates does

Wiegmann Associates is a St. Louis-based, family-owned mechanical contractor founded in 1995 by Gerry Wiegmann that specializes in design/build HVAC systems, value engineering, building automation, and energy efficiency retrofits for commercial, industrial, and institutional clients across the United States. The firm executes projects ranging from $10,000 service contracts to $35M+ design/build installations and has completed more than $1 billion in cumulative HVAC work across 43+ states, with documented reference clients including Anheuser-Busch (a 10+ year strategic partnership with $85M+ in executed work), SurgCenter Development (92+ ambulatory surgery centers in 20+ states), Metal Container Corp, NARA, GSA, and the St. Louis VA Medical Center. The company differentiates through an in-house engineering bench (reportedly three times larger than typical competitors), a dedicated Controls group using Delta Controls DDC platforms that eliminates BAS subcontractor mark-ups, full AutoCAD/Revit/BIM capabilities, and a value-engineering practice that has produced 20–43% upfront cost reductions and guaranteed 3-year-or-less payback on energy projects.

The business model is anchored in project-based design/build and plan/spec HVAC contracting (the majority of revenue), supplemented by recurring 24/7 HVAC service contracts in the St. Louis region and, as of March 2026, an outcome-based 'net-zero' pricing channel for energy efficiency upgrades delivered through a joint venture with EnergyPrint, Inc. The firm is privately held by the Wiegmann family, with Gerry Wiegmann as CEO, Chad Wiegmann as President, and Grant Wiegmann as VP of Business Development; no institutional capital, public listing, or M&A activity is disclosed. Customer concentration in flagship accounts (notably Anheuser-Busch and SurgCenter) is meaningful but partially offset by a long tail of government, healthcare, education, cold storage, industrial, and senior living work. Vertical segmentation spans commercial buildings, education, government/institutional, healthcare, industrial/manufacturing, cold storage and food/beverage, senior living, and warehouses, with recent expansion into regulated cannabis cultivation and a Denver, CO regional office extending geographic reach beyond the Midwest.

Name

Wiegmann Associates

Legal name

Wiegmann Associates

Website

https://wiegmannassoc.com

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

101–250 employees

Short description

Wiegmann Associates is a family-owned St. Louis-based design/build mechanical contractor delivering HVAC, refrigeration, building automation, and energy efficiency solutions to commercial, industrial, institutional, healthcare, government, and cold storage clients across 43+ U.S. states.

Ownership category

akta.pro rank

Product category

Commercial HVAC Mechanical Contracting

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)

SIC

Construction - Special Trade Contractors (1700), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

HVAC & Refrigeration Contracting (IMAFALAB)

akta.pro secondary industries

HVAC Controls & Optimization (Smart Thermostats, VAV, Chillers/Boilers Controls) (BPABAGAB), HVAC Installation, Service & Repair (IMAIABAA), HVAC Service, Maintenance & Repair (BPABACAA)

Keywords

• Design build HVAC contracting
• Mechanical engineering services
• Building automation controls
• Commercial HVAC installation
• Energy efficiency retrofits

Headquarters

HQ city

St. Charles

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Design/Build HVAC Contracting: Wiegmann Associates generates the majority of its revenue through design/build HVAC mechanical contracting services for commercial, industrial, and institutional projects. Revenue is project-based, earned through lump-sum or cost-plus contracts for engineering and installation of HVAC systems.
2. HVAC Service and Maintenance: The company provides ongoing 24-hour preventative maintenance programs and service contracts in the St. Louis region, generating recurring service revenue alongside project-based work.
3. Performance-Based Energy Efficiency (Joint Venture): Through the EnergyPrint joint venture, Wiegmann offers net-zero energy efficiency upgrades where projects are funded through energy savings, with projected savings exceeding monthly amortization costs.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

Wiegmann Associates is a national design/build mechanical contractor that engineers, installs, and services commercial HVAC, refrigeration, and building automation systems for commercial, industrial, institutional, healthcare, government, education, cold storage, and senior living facilities. Its core offerings span design/build HVAC construction, plan/spec HVAC installation, value engineering, energy efficiency upgrades, Delta Controls BAS design and installation, cold storage and refrigeration, medical gas systems, and 24-hour HVAC service and preventative maintenance.

Product overview

Wiegmann Associates is a national design/build mechanical contractor specializing in HVAC solutions. Their portfolio consists of six interconnected service offerings: Design/Build HVAC Services (core design and installation), Value Engineering (cost optimization), Plan/Spec Services (specification-based procurement), Energy Efficiency Solutions (energy-saving upgrades), Building Automation & Controls (Delta Controls DDC systems), and HVAC Service Department (maintenance and repairs). The company serves commercial, industrial, institutional, healthcare, cold storage, education, government, and senior living markets across 43+ states. They differentiate through in-house engineering expertise (three times more engineers than competitors), full AutoCAD/Revit/BIM capabilities, a dedicated Controls group for Building Automation Systems, and a focus on value engineering to reduce first costs and operating expenses.

Differentiator

Problem solved

Functional benefit

Products and services

• Design/Build HVAC Services Complete HVAC system design and construction services for commercial, industrial, institutional, healthcare, government, cold storage, education, senior living, and warehouse facilities, from initial concept through installation and commissioning.
• Value Engineering Cost-optimization engineering consulting to reduce equipment and installation costs while maintaining or improving performance, helping clients bring projects within budget. Documented 20–43% project cost reductions (e.g., Streets of St. Charles, GameWorks Denver, NARA).
• Plan/Spec Services Traditional specification-based HVAC procurement and installation services working with architects and engineers on plan-and-spec projects.
• Energy Efficiency Solutions Energy-saving HVAC upgrades and optimization services designed to reduce operational costs and improve sustainability, with documented 3-year-or-less payback on most efficiency projects and cumulative savings exceeding $120M at Anheuser-Busch alone.
• Building Automation & Controls Building Automation System (BAS) design, installation, and remote monitoring using Delta Controls and other Direct Digital Control (DDC) platforms, delivered by an in-house Controls group that eliminates subcontractor mark-ups.
• HVAC Service Department 24-hour HVAC maintenance, repairs, preventative maintenance programs, and service contracts for commercial facilities in the St. Louis region with remote monitoring capabilities nationwide.
• National Capabilities Nationwide HVAC project execution serving clients across 43+ states using both design/build and plan/spec delivery methods, with a track record of more than $1 billion in completed HVAC projects.
• Cold Storage & Refrigeration Specialized HVAC and refrigeration system design and installation for cold storage warehouses, food distribution centers, refrigerated facilities, breweries, and cannabis cultivation operations requiring precise temperature and humidity control.
• Medical Gas Systems HVAC and medical gas system design and installation for healthcare facilities including hospitals, ambulatory surgery centers, and medical office buildings, including medical gas integration for surgical and patient care areas.

Quantifiable outcome

• Energy savings exceeding $10M per year across all Anheuser-Busch facilities; $120M+ total savings over 12-year partnership
• +5 more outcomes

Named customers24 records

Segments8 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• EnergyPrint, Inc.coreStrategic or Co-development Partner · 19 March 2026EnergyPrint and Wiegmann Associates formed a joint venture to deliver performance-based energy efficiency upgrades. Through this partnership, EnergyPrint offers Wiegmann's design-build efficiency upgrades to its existing clients at 'net-zero' prices, meaning efficiency projects are funded through energy savings with projected savings exceeding monthly amortization costs. The venture leverages EnergyPrint's AI-enabled continuous re-commissioning software to monitor HVAC system performance in real time and verify savings at the utility meter. EnergyPrint is a St. Paul-based energy analytics software company.

Scale indicators10 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• EMCOR Group: EMCOR is one of the largest mechanical and electrical construction services providers in the U.S., offering HVAC, controls, energy services, and facility maintenance. It is directly comparable to Wiegmann as a design-build mechanical contractor pursuing enterprise, industrial, and government customers, but operates at materially greater scale and geographic breadth.
• Comfort Systems USA: Comfort Systems USA is a national mechanical contractor providing HVAC, plumbing, and building automation services to commercial, industrial, and institutional customers. Its design-build and service offering, multi-state operating model, and similar customer base make it a strong structural comparator to Wiegmann.
• APi Group: APi Group is a global, multi-segment provider of safety, specialty, and industrial services with a substantial mechanical contracting and HVAC presence. It overlaps with Wiegmann in commercial and industrial HVAC, controls, and energy services, but operates across many adjacencies at much larger scale.
• IES Holdings: IES Holdings provides electrical and mechanical infrastructure services, including HVAC and building automation, to commercial, industrial, and institutional clients. Its national footprint, design-build delivery, and service mix are directly comparable to Wiegmann's enterprise project model.

Direct peers

• Limbach Holdings: Limbach is a publicly traded design-build mechanical contractor focused on HVAC, plumbing, building automation, and energy services for commercial, healthcare, and institutional customers. Its vertically integrated model with in-house engineering, controls, and service closely mirrors Wiegmann's design/build, value engineering, and BAS positioning.

Regional players

• Murphy Company: Murphy Company is a St. Louis-based mechanical contractor providing HVAC, plumbing, and process piping design/build and service. It is one of Wiegmann's closest local competitors for the same enterprise, healthcare, and institutional clients in the St. Louis market.
• Bowers + Kubota Consulting: Bowers + Kubota is a Hawaii-based design-build mechanical and electrical contractor with a strong HVAC and controls practice. Its project-based delivery for commercial, healthcare, and government customers parallels Wiegmann's enterprise contracting model, though concentrated in a different geography.
• The State Group Industrial (USA) Limited: State Group is a North American mechanical and electrical contractor serving industrial, institutional, and commercial customers with HVAC, plumbing, and controls work. Its multi-province/multi-state project delivery and industrial customer base are comparable to Wiegmann's industrial/manufacturing practice.
• Lee Mechanical Services: Lee Mechanical Services is a Midwest mechanical contractor providing HVAC design/build, fabrication, and service for commercial and industrial facilities. Its regional scale and design-build service mix are comparable to Wiegmann's, though with a smaller geographic footprint.
• John E. Green Company: John E. Green is a Michigan-based mechanical contractor with HVAC, plumbing, and process piping services for industrial, healthcare, and commercial customers. Its design/build delivery, controls capabilities, and institutional customer mix closely resemble Wiegmann's enterprise HVAC practice.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/wiegmann-associates

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 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 Wiegmann Associates