Zien Mechanical Service

Zien Service, Inc. is a single-source Mechanical Contractor offering a wide array of in-house services including Plumbing, Heating, Ventilation, Air-Conditioning, Refrigeration, Process Piping, Building Automation Systems and more.

Since 1919, Zien has forged a solid reputation by providing excellent service throughout Wisconsin, Northern Illinois and Southern Minnesota. Our team is proficient in implementing solutions for commercial, industrial and institutional systems, regardless of size or complexity. Proof is demonstrated in our long list of prestigious projects.
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With service offerings in the Consulting, Energy, and Facility Services fields, Zien advocates collaborative and sustainable solutions that are designed to ensure occupant comfort, improved system efficiency, reduce facility operational costs and optimize client profitability for the life of their building.

Zien has the expertise to handle all your mechanical needs, from design and engineering to fabrication, installation, maintenance and repair. From restaurants and complex buildings to steel foundries and mission critical data centers, Zien services all brands of heating, air conditioning, ventilation and refrigeration equipment.

Our Goal is to create lasting relationships by providing our customers with effective solutions, reliable service, plus a personally and professionally rewarding experience. Our Mission is to provide the highest quality services at competitive prices while maintaining an unparalleled level of integrity.

Everyone on Zien's team has a sincere concern for your needs. Zien's project managers maintain a high level of knowledge and a commitment to approach each situation with a positive attitude. We strive to make our customers feel comfortable in knowing they can depend on us to meet any of their special needs.

It's old-fashioned, but we still do what we say we're going to do. We keep our promises.