Business Details
50+ Years
experience
Emergency
services
Trusted Mechanical Contractors Since 1919
Zien Mechanical Service has been a trusted leader in mechanical contracting since 1919, providing comprehensive solutions across Wisconsin, Northern Illinois, and Southern Minnesota. Our expertise spans plumbing, heating, ventilation, air-conditioning, refrigeration, process piping, and building automation systems, serving commercial, industrial, and institutional clients of all sizes. With nearly a century of experience, we combine cutting-edge technology with time-tested craftsmanship to deliver reliable, sustainable solutions. Our team of union-certified professionals prioritizes integrity, precision, and customer satisfaction, ensuring projects are completed on time, within budget, and to the highest safety standards.From design and installation to maintenance and emergency repairs, we offer end-to-end services tailored to meet complex mechanical needs. Our in-house sheet metal fabrication capabilities and 24/7 emergency response team ensure rapid, cost-effective solutions for critical systems. As a family-owned business, we maintain a legacy of trust, innovation, and community commitment that defines our industry leadership.
Services
Plumbing
HVAC Systems
Refrigeration
Process Piping
Sheet Metal Fabrication
Building Automation
Fire Protection
Details
- Year established: 1919
Highlights and features
- We offer 95+ years of mechanical contracting expertise
- 24/7 emergency response team available year-round
- In-house sheet metal fabrication for faster project completion
- Union-certified technicians with specialized industry training
- We guarantee on-time project delivery with zero compromises on safety
Services
Plumbing
Our plumbing division provides 24/7 installation, repair, and maintenance for commercial and industrial systems. With 30+ union-certified plumbers and state licenses, we handle complex projects across Southeastern Wisconsin and Northeastern Illinois. Our expertise includes emergency leak detection, pipe replacement, and code-compliant system upgrades. Clients benefit from rapid response times and guaranteed workmanship that meets strict safety standards.
HVAC Systems
We design, install, and service commercial HVAC systems for optimal energy efficiency and occupant comfort. Our engineers handle boilers, chillers, heat pumps, and packaged units for facilities of all sizes. Preventative maintenance programs extend equipment lifespan while reducing energy costs. As former residential specialists, we apply decades of technical knowledge to industrial and institutional climate control challenges.
Sheet Metal Fabrication
Our in-house sheet metal shop accelerates project timelines with custom ductwork, fume hoods, and structural components. Advanced machinery including a 20-foot plasma cutter and 90-ton pressbrake enables precision fabrication. Union tradesmen produce guards, supports, and architectural elements that meet exact specifications. This capability reduces third-party dependencies and ensures quality control throughout the construction process.
Process Piping
We design and install mission-critical piping systems for transporting liquids and gases in manufacturing facilities. Our pipefitters adhere to strict tolerances and safety protocols for chemical, pharmaceutical, and food processing applications. Comprehensive services include system layout, material selection, insulation, and compliance documentation. Clients receive durable installations that minimize downtime and meet all regulatory requirements.
Building Automation
Our controls division implements energy-efficient building automation systems for commercial properties. As authorized dealers of Reliable Controls, we program HVAC systems to optimize energy consumption while maintaining comfort. Retrofit solutions modernize legacy systems with digital controls that improve operational efficiency. Custom programming ensures seamless integration across mechanical systems for enhanced facility management.
Questions
What mechanical services does Zien Service offer?
We provide plumbing, HVAC, refrigeration, process piping, sheet metal fabrication, building automation systems, and fire protection services for commercial and industrial clients.
Which areas do you serve?
Our primary service areas include Wisconsin, Northern Illinois, and Southern Minnesota, with headquarters in Glendale, Wisconsin.
Are emergency services available?
Yes, our plumbing division offers 24/7 emergency response for urgent mechanical issues across our service regions.
How long has Zien Service been in business?
We've been serving clients since 1919, making us one of Milwaukee's oldest mechanical contracting firms.
Do you handle large-scale industrial projects?
Yes, our team specializes in complex systems for steel foundries, data centers, and manufacturing facilities requiring specialized mechanical solutions.
What makes Zien different from other contractors?
Our century-long experience, in-house fabrication capabilities, and union-certified technicians ensure superior quality and reliability for every project.
