A Name You Can Trust
Union Service & Maintenance
Service by local experts
The Region's Leader in Commercial HVAC Installation and Design
South Louisiana's Leader in hvac
Servicing South Louisiana
Since 1951
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Louisiana’s Trusted Mechanical Contractor

Merge dedication to quality and a superior work force with the latest technology in Heating, Ventilating and Air Conditioning Systems and you’ve got a good picture of Union Service and Maintenance Company.  We’re proud to be the region’s leader in the design, installation and maintenance of HVAC systems for clients in a variety of industries.  USM- a name you can trust for your most challenging HVAC undertaking.

Since its founding in 1951, USM has been dedicated to meeting the most rigorous quality and safety standards set forth by our clients, while delivering projects on time and within budget.

Every USM employee adheres to three goals: quality, safety and professionalism.  Our adherence to these goals and the fact that USM will not compromise these standards is the cornerstone of our success and our long-term client relationships.

Union Service and Maintenance serves companies of all sizes in a variety of industries, including petro-chemical, manufacturing, offshore and retail.  While each client’s needs are different, all share one common belief: USM consistently delivers the highest quality product.

HVAC Contractors; Service Areas; Coverage Areas


HVAC Controls and Energy Management Solutions
HVAC Mechanical Contractors
HVAC Design and Engineering
HVAC Service and Maintenance