Zien Service, Inc., a trusted Mechanical Contractor based in Milwaukee, WI, has been providing top-notch plumbing, heating, ventilation, air-conditioning, refrigeration, and more since 1919. With a solid reputation for excellence in Wisconsin, Northern Illinois, and Southern Minnesota, Zien offers a wide array of in-house services for commercial, industrial, and institutional systems.
Specializing in collaborative and sustainable solutions, Zien advocates for occupant comfort, improved system efficiency, reduced operational costs, and optimized client profitability. From design and engineering to maintenance and repair, Zien's team of experts ensures high-quality craftsmanship, reliability, and cutting-edge technology to meet all mechanical needs under one roof.
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