Company Overview



Robert Holden            President

Joseph Bellefeuille     Vice President of Sales

Jeffrey Warren            Vice President of Operations

Norman Roy                Vice President of Production



An industry leader who provides complete plumbing and HVAC services, design-build, service contracts, building information modeling (BIM), and pre-fabrication services for a variety of markets including aviation, commercial, commercial residential, education, hospitality, healthcare, manufacturing, retail, and sporting facilities.


605 Front Street, Manchester, New Hampshire 03102

Servicing all of New England


Founded 1974


For more than 40 years it has been our commitment to complete our projects on time and in budget, all while providing our customers with quality, reliable customer service. Keeping up with cutting edge construction products, materials, and training gives us the ability to do so without compromising our quality.


  • Denron Plumbing and HVAC was incorporated under New Hampshire law on May 20, 1974.
  • Denron Plumbing & HVAC was sold on August 4, 1999 and became a subsidiary of Select Energy, Inc., d/b/a Denron Plumbing & HVAC.
  • Select Energy, Inc.  sold their Denron division on November 8, 2005.
  • Denron Plumbing & HVAC, LLC. is still on the cutting edge of the plumbing & mechanical industry.  Currently operating with 120 employees, we specialize in providing quality plumbing and HVAC, reliable customer service and a commitment to complete our projects on time, and in budget.