Western Allied Corporation is Southern California’s trusted commercial HVAC contractor, headquartered in Santa Fe Springs and serving the greater Los Angeles basin since 1960. We specialize in the design, installation, and maintenance of mechanical systems for commercial and industrial facilities — from office buildings and hospitals to entertainment studios and biotech clean rooms. Whether you’re a general contractor looking for a reliable mechanical subcontractor or a building owner seeking a direct HVAC solution, Western Allied brings over 60 years of engineering expertise to every project.
FROM FIRST PRINCIPLES
Our Services.
New Construction
Service & Maintenance
Design & Build
News.
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Projects.
Why Choose Western Allied as Your HVAC Contractor.
Western Allied Corporation has been an industry leader in commercial HVAC contracting in Southern California for over 60 years. Headquartered in Santa Fe Springs, CA, we are owned and operated by some of the most highly trained personnel in the mechanical industry — many of whom are California-licensed professional engineers. Our in-house capabilities include sheet metal fabrication, pipe prefabrication, DDC controls, and full design-build engineering, all delivered by a skilled union workforce.
Our mission is to build lasting relationships with our clients through knowledge, trust, and dependability. We provide exceptional commercial HVAC service — from initial system design through installation and long-term maintenance — and we measure our success by the satisfaction of the building owners, general contractors, and facility managers we serve.
Every project at Western Allied is led by a company partner from start to finish. That means one experienced point of contact handles conceptual design, estimating, project management, and closeout — giving clients consistent communication and direct owner involvement throughout. It’s a structure built for accountability, and it’s a big part of why most of our business comes from repeat clients.
CONSTRUCTION
We have been building HVAC systems in Southern California for over 60 years. Nobody does it better.
SERVICE
Great technicians and by far the highest ratio of degreed engineers to field techs in the industry.
CONTROLS
The leader in both generic and integrated LonWorks & BACnet controls in Southern California.
RETROFIT & REPLACEMENT
An art as much as it is a science. Proven engineering judgment produces value by expertly blending old with new.
Our Clients.
