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26 Years
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Trusted Mechanical Contractors in Massachusetts
Mortimer J S is a family-owned Design-Build Mechanical Contracting firm established in 2000, serving commercial and industrial clients across Massachusetts. Our unique in-house engineering team, including a licensed Professional Engineer, ensures tailored solutions for HVAC systems and mechanical infrastructure. We prioritize open communication, customer satisfaction, and quality workmanship, with over two decades of experience in diverse sectors like education, healthcare, and laboratories.

Our 24-hour service team guarantees prompt support, while our design experts specialize in complex installations without disrupting existing operations. With a reputation built on trust and technical excellence, we deliver cost-effective, functional HVAC systems for every project.
Services
Design Build Service & Maintenance Mechanical Infrastructure Commercial HVAC Industrial HVAC Laboratory Systems Educational Facilities Healthcare HVAC
Details
  • Year established: 2000
Highlights and features
  • We have 20+ years of experience in commercial and industrial HVAC systems.
  • Our in-house engineering team includes a licensed Professional Engineer.
  • We provide 24-hour emergency service and maintenance support.
  • Our team specializes in complex laboratory and healthcare facility installations.
  • We maintain transparent communication and prioritize customer satisfaction.
Services
Design Build
Our design-build approach integrates in-house engineering with hands-on installation expertise. We create tailored HVAC solutions for commercial and industrial spaces, ensuring systems meet functional requirements while optimizing energy efficiency. With direct collaboration between designers and field technicians, we deliver seamless project execution from concept to completion.
Service & Maintenance
24/7 emergency and routine maintenance services keep HVAC systems operating at peak performance. Our certified technicians respond promptly to service calls, addressing issues in commercial, industrial, and institutional facilities. Preventative maintenance plans extend equipment lifespan while minimizing operational disruptions.
Mechanical Infrastructure
We specialize in upgrading aging mechanical systems with modern, efficient components. Our engineers assess existing infrastructure to recommend cost-effective improvements that enhance performance and compliance. From piping systems to process gas installations, we handle complex retrofit projects with minimal downtime.
Commercial HVAC
Tailored HVAC solutions for office buildings, retail spaces, and institutional facilities. Our team designs and installs systems that maintain comfort while meeting budget constraints. We understand commercial clients' unique needs, including noise control, zoning requirements, and integration with existing building management systems.
Industrial HVAC
Robust HVAC systems for manufacturing plants, warehouses, and distribution centers. We engineer solutions that withstand demanding environments while maintaining temperature and air quality standards. Our experience includes specialized systems for high-heat processes and large-volume spaces.
People
Jack Mortimer
CEO & Founder
Jack founded Mortimer J S in 2000, leveraging decades of mechanical contracting experience. He oversees strategic operations while maintaining direct client relationships. His leadership emphasizes quality craftsmanship and customer satisfaction.
Michael Mortimer
President
As President and licensed Professional Engineer, Mike directs technical operations and project engineering. With 20+ years in mechanical systems design, he ensures technical excellence across all projects while mentoring engineering staff.
Matt Mortimer
Vice President
Matt manages day-to-day operations and project coordination. His hands-on experience in commercial HVAC installations ensures practical solutions that balance client needs with technical requirements.
Brandon Beauregard
Technical Services Director
Brandon leads our service department, overseeing maintenance operations and technician training. He specializes in complex system diagnostics and emergency response protocols, ensuring 24/7 service reliability.
Derek Ritchotte
Field Operation Manager
Derek supervises field operations and installation crews. As a Master Plumber, he brings technical expertise to mechanical system installations while ensuring adherence to safety and quality standards.
Questions
What services does J.S. Mortimer offer?
We provide design-build mechanical contracting, HVAC installations, 24/7 maintenance, and infrastructure upgrades for commercial, industrial, educational, and healthcare facilities.
Do you serve residential clients?
Our focus is exclusively on commercial and industrial clients, including educational institutions and healthcare facilities.
Are your technicians available for emergencies?
Yes, our service team offers 24-hour emergency support for urgent HVAC or mechanical issues.
What makes your company different?
We combine in-house engineering expertise with hands-on field experience, ensuring customized solutions that balance functionality and cost-effectiveness.
Do you work outside Massachusetts?
While our primary focus is Massachusetts, we evaluate projects based on scope and client needs.
How do you handle complex laboratory installations?
Our team specializes in laboratory HVAC systems, working closely with owners to ensure safe, efficient installations without disrupting operations.