J.M. Brennan, Inc. is one of Wisconsin’s oldest and most reputable mechanical contractors. With complete in-house capabilities, from design and installation to service and maintenance, we’re a single source resource for HVAC, plumbing, process piping, industrial sheet metal, controls, HVAC Service and more. 

As mechanical contractors, we draw on our in-depth understanding of the mechanics of every component in your building—from boilers to software—to offer novel solutions to satisfy even the most demanding projects. The commitment and quality of our people and our customer-driven approach to doing business are the main factors behind our longevity and lengthy list of repeat customers.

Advantages

• We act as a proactive business partner, learning about your specific business needs to offer customized, cost-effective solutions.
  
  
• We back our certified engineers, designers, technicians and tradespeople with ongoing training and a commitment to the resources they need to do the best possible job. 
  
  
• With year-round employment and minimal turnover, we offer the stability and expertise of an ongoing, seasoned crew.
  
  
• We own the largest fleet in the region to ensure a rapid service response and on-time completion of your project.
  
  
• We handle installation, service and maintenance for projects of all sizes and complexity.
  
  
• Our experienced, knowledgeable staff handles calls 24/7 for an immediate response. 
  
  
• We continually expand our product knowledge through training and new product testing to create new ways to serve customers’ needs and positively impact their facilities’ performance. 
  
  
• We’re experienced with the widest range of products. Because we’re not limited to working with proprietary products, we’re able to provide our customers with the best-in-class solutions for their needs.