Western Allied has the resources, capability and commitment to provide a complete, cost effective and quality HVAC system installation while accommodating the most aggressive construction schedules.

Large Project Experience:

Proven track record in office building, hotel, retail, biotechnology, clean room, industrial manufacturing, and entertainment facilities on a design/build and design/assist basis. Extensive list of reference projects available upon request.

Pre-Construction Services:

Provide experienced estimating and consulting services to assist in establishing accurate budgets and to address difficult constructability issues. Utilize our engineering and construction expertise to offer alternatives which bring value to the project during the pre-construction phase.

Engineering Department:

Staffed with State of California licensed professional engineers to provide complete HVAC system design, assist in code compliance and building department issues, etc. Provide CAD quality design drawings required for plan check and construction as well as detailed shop drawings essential for coordination between multiple trades. Coordinate BIM and 3D CAD drawings for entire projects (all disciplines).

Experienced Project Management:

Performed by graduate engineers with direct involvement from a principal of the company throughout the duration of all major projects.

HVAC Ductwork and Piping:

Fabrication shop on our premises with fabrication and field installation performed by trained, experienced and skilled union workforce.

HVAC Temperature Controls:

Western Allied Corporation has factory-certified personnel expert in the installation and programming of DDC controls incorporating LonWorks, BACnet and Modbus based technologies. We were the first Mechanical Contractor in Southern California to achieve Lon System Integrator Certification.

HVAC Start-up, Commissioning/Air Balance Departments:

Trained and certified in accordance with NEBB requirements.

Service Department:

On call 24-hours per day for warranty calls, emergency service calls and service/maintenance contracts.

Why Choose Us.

Western Allied Corporation has been an industry leader in HVAC for over 60 years. Headquartered in Santa Fe Springs, CA, Western Allied is owned and operated by the industry’s most highly trained and qualifed personnel. Our facilities include in-house sheet metal and piping fabrication as well as proficiencies in stainless steel, black iron, galvanized, copper, PVC and other piping systems. We have a long and successful history of direct digital control (DDC) installation and support. We were the frst mechanical contractor to achieve LonWorks System Integrator status in Southern California.

Our mission is to foster a culture of knowledge, trust, and dependability within our company and implement those principles in our valued customer relationships. In addition, we strive to provide exceptional service through design, installation, and maintenance of HVAC systems.

Each of the partners at Western Allied is the head of a project team. Each team works with the company’s clients in order to see a project from inception to completion. This means that each team is responsible for; conceptual design, estimating, project management and project closeout and turnover. We feel that this structure is advantageous because it provides our clients with consistent points of contact throughout a project and ensures that an owner of Western Allied has direct involvement in and oversight of every project that the company is involved with.


We have been building HVAC systems for over 60 years. Nobody does it better.


Great technicians and by far the highest ratio of degreed engineers to field techs in the industry.


The leader in both generic and integrated LonWorks & BACnet controls in Southern California.


An art as much as it is a science. Proven engineering judgment produces value by expertly blending old with new.