Cullum
Cullum Mechanical is a full-service mechanical contractor founded in 1972, providing commercial and industrial HVAC, plumbing, process piping, refrigeration, and mechanical maintenance services to enterprise clients across South Carolina, North Carolina, and Georgia.
- Company typePrivate
- Founded1972
- HeadquartersNorth Charleston, United States
- Headcount1–10
- GTM typeB2B
- OfferingServices
What Cullum does
Cullum Mechanical is a full-service mechanical contractor headquartered in North Charleston, South Carolina, providing commercial and industrial HVAC, plumbing, process piping, refrigeration, and mechanical construction services across the Southeast. Founded in 1972 by Furman Cullum and reorganized in 2023 as Cullum Mechanical, LLC (with Rudy Cullum as Managing Member), the firm operates through two core, wholly-owned subsidiaries established in 1999: Cullum Constructors, Inc. for mechanical construction, and Cullum Services, Inc. for HVAC service and maintenance. The company holds unlimited mechanical and general contracting licenses in South Carolina and is additionally licensed for mechanical and plumbing work in North Carolina and Georgia, serving enterprise customers in healthcare, manufacturing, data centers, education, government, and commercial real estate. Approximately 245 employees work across four South Carolina locations: the 30,000-square-foot North Charleston headquarters plus an 18,000-square-foot prefabrication facility, and service branches in Charleston, Columbia, and Greenville. The firm is ENR-ranked as a top mechanical, plumbing, and specialty contractor in the Southeast and emphasizes workforce development through apprenticeship partnerships with Trident Technical College.
The technical capability set is anchored by HVAC systems installation and service, sheet metal fabrication, plumbing, process piping, building automation systems, medical gas piping, industrial ventilation, and commercial refrigeration. A key operational asset is the in-house state-of-the-art sheet metal and pipe prefabrication facility, which supports project execution and quality control. Core products and services span Mechanical Construction & Maintenance (project management, pre-construction, plumbing, commercial and industrial HVAC/R systems, and process piping), HVAC Services (preventive maintenance, installation, retrofitting, replacement, and repair with 24-hour emergency dispatch), and add-on services including electrical maintenance, refrigeration, mechanical maintenance, and specialized capabilities in air conditioning, ventilation, heating, and medical gas piping. The combined service + construction offering, prefabrication capacity, multi-state licensing, and long-tenured field workforce form the basis for both project execution and recurring service revenue.
Cullum's revenue model combines one-time project-based mechanical construction (HVAC installation, plumbing, process piping, sheet metal work for new construction and major renovations) with subscription/recurring HVAC service and maintenance revenue (preventive maintenance contracts plus 24-hour emergency dispatch). Projects are priced via custom quotes based on specifications and scope; service work is billed on labor and materials, with multi-year contracts typical for institutional and enterprise clients. Go-to-market is enterprise field sales: project managers, service managers, and field sales teams directly engage commercial, industrial, and government clients across South Carolina, North Carolina, and Georgia, supported by industry association membership (MCASC) and earned-media visibility through ENR regional rankings. The company is privately held under family ownership with no external private equity or venture capital disclosed in the source materials.
Cullum firmographics
Firmographics- Name
- Cullum
- Legal name
- Cullum Mechanical Construction, Inc.
- Website
- https://culluminc.com
- Company type
- Private
- Founded year
- 1972
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Cullum Mechanical is a full-service mechanical contractor founded in 1972, providing commercial and industrial HVAC, plumbing, process piping, refrigeration, and mechanical maintenance services to enterprise clients across South Carolina, North Carolina, and Georgia.
- Ownership category
- akta.pro rank
Cullum industry classification
Industry- Product category
- Mechanical Contracting and HVAC Services
- NAICS
- Commercial and Service Industry Machinery Manufacturing (333310)
- SIC
- Refrigeration & Service Industry Machinery (3580)
- akta.pro primary industry
- Storage & Conveyance Structures (Reservoirs, Tanks, Culverts, Tunnels) (IMAFAGAE)
Keywords
Where Cullum is headquartered
LocationHeadquarters
- HQ city
- North Charleston
- HQ country
- United States
- HQ region
- North America
Offices4 records
Markets served
Cullum business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Supply Chain, Operations, Infrastructure, Technology or R&D, Marketing or Sales
Revenue model
- Mechanical Construction Services: Project-based mechanical construction including HVAC installation, plumbing, process piping, and sheet metal work for new construction and major renovations
- HVAC Service and Maintenance: Ongoing repair, maintenance, and service contracts for commercial and industrial HVAC systems including 24-hour dispatch service
- Commercial Refrigeration Services: Design, installation, and service of commercial refrigeration applications
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Custom project-based pricing |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels4 records
Cullum product offering
Product offeringCore offering
Cullum Mechanical provides full-service mechanical contracting for commercial, industrial, institutional, and government facilities across the Southeast. Its core offerings span mechanical construction (design-build, pre-construction, project management) and ongoing HVAC services (preventive maintenance, installation, retrofitting, replacement, and 24/7 repair), complemented by commercial plumbing, process piping, medical gas piping, commercial refrigeration, and electrical maintenance.
Product overview
Cullum Mechanical is a full-service mechanical contractor offering a unified portfolio of mechanical construction and HVAC services. The core offerings include Mechanical Construction & Maintenance (project management, pre-construction, plumbing, HVAC/R systems, and process piping) and HVAC Services (preventive maintenance, installation, retrofitting, replacement, and repair). These are complemented by add-on services such as electrical maintenance, refrigeration, and mechanical maintenance. The company also provides specialized capabilities in air conditioning, ventilation, heating, and medical gas piping. A key support capability is the in-house fabrication services with sheet metal and pipe prefabrication facilities. The company operates across South Carolina through offices in Charleston, Columbia, and Greenville, serving commercial, industrial, and institutional clients.
Differentiator
Problem solved
Functional benefit
Products and services
- Mechanical Construction and Maintenance Full mechanical design-build and construction services including project management, pre-construction planning, plumbing, commercial and industrial HVAC/R systems, and process piping for commercial, industrial, institutional, and government facilities across the Southeast.
- HVAC Services Recurring HVAC service offering covering preventive maintenance, installation, retrofitting, replacement, and 24/7 emergency repair for commercial and industrial HVAC systems across Charleston, Columbia, and Greenville service territories.
- Commercial and Industrial HVAC/R Systems Design, installation, and service of specialized heating, ventilation, air conditioning, and refrigeration (HVAC/R) systems for commercial and industrial facilities.
- Commercial Plumbing Installation, repair, and routine maintenance of commercial and industrial plumbing systems.
- Process Piping Industrial process piping installation and maintenance for manufacturing facilities, plant operations, and industrial process systems.
- Commercial Refrigeration Design, installation, and service of commercial refrigeration including walk-in, reach-in, and solid or glass door refrigeration applications.
- Electrical Maintenance Electrical maintenance and general electrical service repairs including lighting services for commercial and industrial facilities.
- Mechanical Maintenance Preventive mechanical maintenance services designed to keep equipment operating at peak efficiency, including inspections, lubrication, cleaning, and filter changes.
- Medical Gas Piping Specialized medical gas piping installation for hospitals and healthcare facilities requiring compliant medical gas distribution systems.
- Sheet Metal and Pipe Prefabrication In-house sheet metal and pipe prefabrication services using state-of-the-art fabrication facilities to support project delivery and construction schedule reliability.
Quantifiable outcome
- 15% women in workforce (exceeds 10.8% national average for construction industry)
- +1 more outcomes
Companies that use Cullum
Customer profileNamed customers6 records
Segments4 records
Ideal customer profiles5 records
Cullum technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Cullum partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Mechanical Contractors Association of South Carolina (MCASC)minorIndustry association membership providing networking, advocacy, and professional development resources for mechanical contractors in South Carolina. Cullum displays MCASC affiliation on website and is a member in good standing.
Scale indicators4 records
Recent moves9 records
Expansion highlights5 records
Cullum competitors and assessment
Company assessmentDirect peers
- TDIndustries: Employee-owned mechanical contractor delivering HVAC, plumbing, and building services to commercial and industrial customers in the South and Southwest. Closely comparable trades mix, recurring service emphasis, and employee-ownership culture.
- Limbach Holdings: Public mechanical contractor focused on HVAC, plumbing, and building controls for commercial, institutional, and mission-critical customers. Closely comparable business model, customer mix, and revenue mix between construction and service.
- Hoffman & Hoffman: Mid-Atlantic and Southeast commercial HVAC contractor with strong design-build and service capabilities. Comparable size and end-market mix, particularly for institutional and commercial mechanical projects.
Regional players
- MG McGrath: Southeast-focused (Charlotte/Asheville) commercial mechanical and plumbing contractor serving healthcare, higher education, and mission-critical clients. Direct regional competitor to Cullum across the Carolinas.
Broad incumbents
- APi Group: Global safety, specialty, and industrial services conglomerate with significant mechanical services exposure through legacy businesses. Competes with Cullum for institutional and specialty mechanical work and trades.
- Service Logic: Commercial HVAC, mechanical, and plumbing service platform consolidating regional mechanical service companies. Adjacent to Cullum's service business model and a likely exit/roll-up reference point.
- EMCOR Group: Fortune 500 mechanical and electrical construction, facilities services, and energy solutions provider. Competes with Cullum for institutional, healthcare, and data center mechanical work at significantly larger scale.
- Comfort Systems USA: Large publicly traded national mechanical contractor providing HVAC, plumbing, and electrical services to commercial and industrial customers. Most direct scaled analog to Cullum with overlapping trades, project/service mix, and target end markets.
- Engie Services: Mechanical services, building automation, and energy solutions arm of a global utility. Competes with Cullum in BAS, energy-efficient HVAC retrofits, and facility maintenance for commercial and institutional customers.
Others
- ACR Supply: HVAC and refrigeration parts distributor serving the Carolinas. Adjacent ecosystem participant that supplies parts and equipment to mechanical contractors including Cullum.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks5 records
Key highlights7 records
Customer concentration
Cullum social profiles
Digital presenceCullum financial estimates
Financial estimateRevenue estimate
Valuation estimate
Cullum leadership team
Management profileNumber of profiles
Profiles2 records
Cullum subsidiaries and ownership
Company hierarchySubsidiaries2 records
Cullum funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Cullum M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Cullum
What does Cullum do?
Cullum Mechanical provides full-service mechanical contracting for commercial, industrial, institutional, and government facilities across the Southeast. Its core offerings span mechanical construction (design-build, pre-construction, project management) and ongoing HVAC services (preventive maintenance, installation, retrofitting, replacement, and 24/7 repair), complemented by commercial plumbing, process piping, medical gas piping, commercial refrigeration, and electrical maintenance.
Is Cullum a public or private company?
Cullum is a private company. It is classified as family owned and is currently operating.
When was Cullum founded?
Cullum was founded in 1972. It employs 1 to 10 people.
Where is Cullum based?
Cullum is headquartered in North Charleston, United States, in the North America region.
How does Cullum make money?
Three revenue lines are on record. Mechanical Construction Services are the primary driver. The others are HVAC Service and Maintenance and commercial Refrigeration Services.
Who are Cullum's main competitors?
Direct peers on record are TDIndustries, Limbach Holdings and Hoffman & Hoffman. MG McGrath is listed as a regional player. Broad incumbents are APi Group, Service Logic, EMCOR Group, Comfort Systems USA and Engie Services. ACR Supply is listed as an others.
Does Cullum have an API?
No public API is recorded for Cullum.
What industry is Cullum in?
Cullum's product category is Mechanical Contracting and HVAC Services. Its primary akta.pro industry code is IMAFAGAE, Storage & Conveyance Structures (Reservoirs, Tanks, Culverts, Tunnels). Its NAICS code is 333310 and its SIC code is 3580.