Mechanical Engineer (HVAC)

Creativity. Innovation. A desire to effect positive change. That’s what it takes to work at Fuss & O’Neill – because that’s what we do for the communities in which we work: we create, innovate, and design long-lasting improvements that improve quality of life. Quality of life is also important on the job, so we’ve prioritized work-life balance by offering flexible/remote work opportunities, part-time benefits, and generous PTO.

We believe that each day is an opportunity to support one another, to support our clients, and to support our communities. If you feel the same, then you’ve found your future. Fuss & O’Neill, a leading New England-based consulting firm, is seeking a Mechanical Engineer to join our growing MEP team. This is an exciting opportunity for a mechanical engineer with HVAC consulting experience to take on increasing responsibility across a diverse range of building projects while working alongside experienced engineers and multidisciplinary project teams.

The Mechanical Engineer will focus primarily on HVAC engineering and design , with opportunities to contribute to plumbing and energy-efficiency projects. This position combines technical design and analysis with field investigations and construction support, providing the opportunity to work across multiple phases of project delivery. Develop HVAC designs and engineering solutions for commercial, institutional, and other building projects, including load calculations, equipment sizing, and technical analysis.

Create and update mechanical drawings and models using AutoCAD and Revit , coordinating designs with architectural, structural, electrical, and other disciplines. Conduct weekly field investigations and site visits, and support construction administration through site observations, submittal reviews, RFIs, and related project activities. Manage assigned design tasks independently while collaborating with senior engineers on technical decisions, quality control, and final design review.

Prepare calculations, specifications, technical reports, and project documentation while applying applicable codes and standards, including IBC, IMC, ASHRAE, NFPA, and IECC . Communicate effectively with project teams, clients, contractors, and other stakeholders, while supporting plumbing and energy-efficiency projects as opportunities arise. Bachelor’s degree in mechanical engineering or a closely related field. 2+ years of mechanical engineering experience , preferably within an HVAC consulting environment.

EIT certification or progress toward obtaining an EIT preferred. Proficiency with AutoCAD ; experience with Revit or other BIM software preferred Experience with HVAC load calculation software , such as Trane TRACE, preferred. Experience with plumbing design, energy efficiency, or energy modeling is a plus. Willingness to work approximately 3–4 days per week in the office and travel periodically for fieldwork.

This is a hybrid role , offering the best of both worlds—collaborate in-office with a high-performing team and enjoy the flexibility of working remotely part of the week. We're committed to supporting work-life balance while maintaining strong team connection and project delivery.