About Denron Hall

Denron Hall is a licensed and insured plumbing and HVAC contractor with a strong reputation for superior service. We serve commercial and industrial clients throughout New England, committing to completing projects on time and within budget while providing our customers with the highest quality of installations paired with reliable customer service.

Our staff of highly trained Project Managers, Licensed Engineers, Licensed Plumbers, Journeymen Plumbers, and Service Technicians provide services in the following areas:

  • Design-Build for HVAC Systems - including renovations and upgrades, temperature and humidity applications, ventilation and dehumidification systems, and energy recovery systems
  • New Construction Plumbing Systems
  • Building Automation Systems/Building Controls
  • Sheetmetal Fabrications and Installation
  • Medical Gas Piping
  • HVAC Service, Preventative Maintenace, and Emergency Service
  • Plumbing Service, Preventative Maintenace, and Emergency Service
  • Drain Cleaning - including Backflow prevention, test, repair, and emergency drain cleaning service
  • Air Purification Services

From concept to design, our team is with you from start to finish. We have the ability to create, engineer, design, and install plumbing, HVAC process piping, medical gases, and building automation systems in all building classifications. In addition, we offer a wide variety of preventive maintenance and service contracts for simple and complex systems.

We also offer 24/7 emergency services for all our clients throughout New England. When you need an emergency repair, we will be there. Our licensed and insured staff have extensive skills and experience to perform emergency services to fix any issues you’re experiencing and give you peace of mind.


In 2021 two of New Hampshire’s most successful mechanical contractors combined teams to form a commercial plumbing and HVAC powerhouse.

Denron Plumbing & HVAC LLC served commercial and industrial clients throughout New England since 1974 and J Lawrence Hall, a family-owned and operated design-build mechanical contractor, since 1937.

It was important for each company to find a partner who could help carry on the legacies built over decades.

Mission Statement

To provide our clients with value added services, knowledge, and support, which ensures that every project is a success.

Safety Policy

Denron Plumbing & HVAC, LLC is a Member of Associated Builders and Contractors, Inc. Together with ABC, Denron believes in a zero accident workplace.

Safety has to be everyone’s concern. Your first thought every day should be, “How can I do my job safely?”. Not only should you be concerned about your safety, but that of your fellow workers.

Denron’s goal is to foster a “Zero Accident Culture”. To create the safest and most productive work environment possible.

It is the responsibility of each job site supervisor to make sure that personal protective equipment required by this policy is readily available to all workers on job sites.