What Southport Engineered Systems, LLC does

Southport Engineered Systems, LLC is a privately held commercial and industrial mechanical contractor founded in 2005 and headquartered in Caledonia, Wisconsin, with regional offices in Madison and Wausau. The company designs, installs, repairs, and maintains HVAC, plumbing, fire protection, building automation, and geothermal systems for customers across Southeastern Wisconsin and Northern Illinois, serving verticals that include manufacturing, industrial, K-12 and higher education, government and municipal, healthcare, senior living, multi-family and hospitality, retail, and warehousing. Service is delivered through enterprise field sales with quote-based bid submissions and 24/7 emergency response.

The company's technical core is built around an integrated design-build and prefabrication model. In-house Professional Engineers and LEED-accredited designers use 3D Autodesk Revit BIM to coordinate complex projects, while a 45,000 sq. ft. fabrication facility leverages Sysque prefabrication software, duct coil lines, and orbital welders to produce welded pipe spools, ductwork, and sprinkler piping off-site. Building automation delivery is anchored by Carrier Controls Expert IS Level certification and multi-vendor capability across Trane, Johnson Controls, Automated Logic, Distech, Alerton, Verasys, Schneider Electric, and Tekmar. The company also manufactures wholesale ductwork (rectangular, spiral, and custom fittings) for sale to external contractors.

Revenue is generated primarily through project-based commercial mechanical contracts, with individual project values disclosed in the $1.6M-$2.8M range on named engagements (Springs of Kenosha, Siena on the Lake, Dickson Hollow, Olympia Brown Science School), supplemented by recurring HVAC service and maintenance agreements on boilers, chillers, rooftop units, VRF systems, and BAS. The customer base is diversified across nine vertical segments and concentrated geographically within a 29+ county service area. The firm employs over 160 people and has been consecutively recognized as a Milwaukee Journal Sentinel Top Place to Work (2018-2020, 2025); it operates as an independent LLC with no disclosed institutional ownership or external funding.

Name

Southport Engineered Systems, LLC

Legal name

Southport Engineered Systems LLC

Website

https://southportengsys.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

101–250 employees

Short description

Southport Engineered Systems is a privately held Wisconsin-based commercial mechanical contractor founded in 2005 that designs, installs, and maintains HVAC, plumbing, fire protection, building automation, and geothermal systems for commercial, industrial, government, healthcare, and senior living customers across Southeastern Wisconsin and Northern Illinois.

Ownership category

akta.pro rank

Headquarters

HQ city

Caledonia

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Commercial HVAC Services: Design, installation, repair, and maintenance of commercial heating and cooling systems including rooftop units, geothermal, VRF, and ventilation systems. Revenue generated through project-based contracts and service agreements.
2. Commercial Plumbing Services: Design, installation, and maintenance of commercial plumbing systems including water, waste, storm sewer, process piping, and backflow prevention. Revenue from project contracts and service calls.
3. Fire Protection Services: Design, installation, and maintenance of fire sprinkler systems, fire alarms, and suppression systems. NFPA 13 compliant water systems and related safety equipment.
4. Wholesale Ductwork: Manufacturing and sale of commercial ductwork including rectangular, spiral, and custom fittings in various materials and gauges. Available to other contractors in the industry.
5. HVAC Maintenance Contracts: Ongoing maintenance services for HVAC equipment including boilers, chillers, air handlers, rooftop units, and building automation systems. Customized maintenance plans for facilities.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Southport Engineered Systems is a full-service commercial mechanical contractor that designs, installs, repairs, and maintains HVAC, plumbing, fire protection, and building automation systems for commercial, industrial, and government facilities. The company complements its installation services with in-house design (3D BIM), prefabrication (Sysque software, orbital welders, duct coil line), and 24/7 emergency service. It also sells manufactured ductwork wholesale to other contractors.

Product overview

Southport Engineered Systems is a commercial HVAC, plumbing, and fire protection services company offering integrated mechanical systems solutions. The core offerings consist of three main service pillars: Commercial HVAC Services (design, installation, repair, and maintenance of heating, ventilation, and air conditioning systems), Commercial Plumbing Services (design, installation, and maintenance of piping systems for water, gas, drainage, and sewage), and Commercial Fire Protection Services (design, installation, and repair of fire sprinkler systems). These core services are supported by specialized modules including Building Automation Systems, Prefabrication Services, Design Capabilities (using 3D Autodesk Revit), and HVAC Service and Maintenance. The company also offers specialized HVAC solutions including Geothermal HVAC Systems, Conventional and Rooftop Systems, Commercial Heat Pump Services, Commercial VRF Systems, and Commercial Boiler Services. Additional offerings include Wholesale Ductwork (manufacturing ductwork for external customers) and Custom Design Fire Suppression Systems. The company utilizes prefabrication software Sysque and state-of-the-art fabrication equipment to deliver integrated mechanical system solutions for commercial and industrial facilities across Southeastern Wisconsin and Northern Illinois.

Differentiator

Problem solved

Functional benefit

Products and services

• Commercial HVAC Services

Quantifiable outcome

• Over 40% more efficiency with geothermal systems compared to conventional HVAC
• +2 more outcomes

Named customers15 records

Segments9 records

Ideal customer profiles8 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration10 records

Feature5 records

Partnerships

Two partnerships are on record, tiered core.

• CarriercoreTechnology or IntegrationCarrier Controls Expert – IS Level certification. Multiple in-house factory trained BAS Engineers and Technicians ready to turn-key customized building automation systems for specific customer needs.
• HVAC Equipment ManufacturerscoreTechnology or IntegrationPartner brands include AAON, American Standard, Carrier, Comfortmaker, Daikin, Goodman, Greenheck, Johnson Controls, Lennox, Modine, Reznor, Trane, and York. Company installs and services equipment from these manufacturers.

Scale indicators6 records

Recent moves9 records

Expansion highlights5 records

Broad incumbents

• EMCOR Group: EMCOR Group is the largest publicly traded U.S. mechanical & electrical contractor providing HVAC, plumbing, fire protection, and building services to commercial, industrial, and utility customers. It is the broad incumbent comparison for a full-service regional MEP contractor like Southport, with far greater scale but a comparable full-service multi-trade delivery model.
• APi Group: APi Group is a global leader in safety, specialty, and industrial services with deep fire suppression/life safety exposure and adjacent mechanical services. Comparable to Southport's fire protection and integrated MEP offering, with substantially greater scale and capital access.
• Southland Industries: Southland Industries is one of the largest U.S. mechanical contractors with MEP, fire protection, and building services plus significant in-house prefabrication. Directly comparable to Southport's design-build + prefabrication + MEP bundle, though at meaningfully larger scale and multi-region presence.
• Comfort Systems USA: Comfort Systems USA is a national HVAC mechanical contractor serving commercial, industrial, and institutional markets through regional subsidiaries. Directly comparable to Southport's HVAC-install-and-service core, but operating at materially larger scale through decentralized branches across the U.S.

Direct peers

• Limbach Holdings: Limbach Holdings is a specialty mechanical contractor focused on HVAC, plumbing, and building controls for commercial and institutional customers, with growing owner-direct and maintenance revenue mix. Closely aligned with Southport's design-build MEP-plus-BAS positioning, though Limbach has gone public and pursues an explicit roll-up strategy.
• J.F. Ahern Co. J.F. Ahern is a Wisconsin-headquartered mechanical and fire protection contractor serving industrial, commercial, and institutional customers across the Midwest. Highly comparable as a same-state, full-service MEP+firestop competitor with a similar customer profile and long regional tenure.
• Berg Mechanical: Berg Mechanical is a Midwest-focused mechanical contractor providing HVAC, plumbing, prefabrication, and service to commercial and industrial customers. Direct peer given overlapping geographic footprint (Wisconsin/Illinois region), prefabrication capabilities, and multi-trade service model.
• CIVE Mechanical & Engineering: CIVE Mechanical is a commercial mechanical contractor providing HVAC, plumbing, and process piping for industrial and institutional clients in the Midwest. Comparable as a mid-sized regional MEP firm competing for similar design-build and renovation projects in markets adjacent to Southport's footprint.
• Montech Mechanical: Montech Mechanical is a Wisconsin-area commercial HVAC, plumbing, and refrigeration service provider. Direct regional peer overlapping with Southport's SE Wisconsin service territory and customer segments (commercial, industrial, institutional).

Regional players

• Hilscher-Clarke Electric: Hilscher-Clarke is a Midwest electrical and mechanical contractor serving commercial, healthcare, education, and industrial customers. Comparable as a regional, multi-trade specialty contractor that competes with Southport for similar bid opportunities in Wisconsin/Illinois.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

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 Southport Engineered Systems, LLC