Protect Your Peace of Mind
We Detect It Early So You Stay Worry-Free
Our expansive team of highly trained technicians delivers fast, responsive, fully digital service across Greater Boston — supported by paperless documentation and real-time updates that keep you in the loop.
From proactive maintenance to 24/7 emergency support, we’re here when you need us — and even before you do.
What We Offer
24/7 Emergency Service
Day or night, rain or shine — our certified technicians are always ready. We have 75 service vehicles on the road, and we provide expert diagnosis, clear recommendations, and transparent pricing before any work begins.
HVAC Service and Repair
We service, repair, and replace heating and cooling systems across a wide range of building types — commercial, educational, medical, and multi-family residential.
Equipment Replacement and Retrofits
Our team evaluates the condition and performance of your current systems and provides data-driven upgrade recommendations — complete with cost-saving analyses and lifecycle projections.
Plumbing Service
With over 100 years of collective experience, we’re ready to support your entire plumbing infrastructure — from backflow testing and booster pumps to domestic water systems, emergency repairs, and more.
Special Projects Team
Our team of experienced Account Managers is ready to support your building needs with responsive, reliable expertise. From pricing and budgeting to navigating mechanical system options, they’ll partner directly with your team to ensure you have clear, accurate information every step of the way. Backed by strong customer relationships and deep industry knowledge, our sales team works alongside you to keep your mechanical systems performing at their best.
Custom Predictive Maintenance Programs
We design proactive maintenance plans that are tailored around your systems’ needs. Services include:
- Condenser coil cleaning
- Air filter replacement
- Building automation maintenance
- Chiller tube brushing and more
- Boiler cleaning and tuning
Mitsubishi Electric
Certified Diamond Contractor
We’re proud to be Boston’s only mechanical contractor with certified Diamond Contractor status from Mitsubishi Electric. This exclusive designation means our technicians have completed intensive training at Mitsubishi Electric’s authorized centers — giving us:
- Priority access to factory technical support
- Industry-leading 10-year parts and 10-year compressor warranties
- 2-year extended labor warranty at no added cost
Service Team
Peter McLean
Executive VP, Service
Sarah Ferrulle
Service Sales Manager
Connor Leslie
PMA Sales Manager
Keith Reissfelder
Service Manager
Peter McLean
Executive VP, Service
Peter joined Cox Engineering in 2020 with over 25 years of experience in the HVAC industry. He began as Service Operations Manager and currently holds the Executive Vice President role within this division. In this role, Peter leads the service team, overseeing the administration, hiring, project execution, and financial performance of the group. When he is not in the office, he enjoys skiing, playing golf, and spending time with his wife, two children, and their family dog.
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Sarah Ferrulle
Service Sales Manager
Sarah joined Cox Engineering in 2024 as the Service Sales Manager for the Special Projects Team. With extensive experience in construction estimating, sales, project management, and business development within the mechanical contracting industry, she is dedicated to fostering strong relationships. Sarah collaborates closely with firm leadership, overseeing pipeline management, and client engagement. She is an active member of the BTEA Northeast Women's Council. Outside of work, you can find her staying active outdoors with her son, exercising, out on the water, or cooking. She always welcomes a challenge — especially if it’s a game of pickleball!
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Connor Leslie
PMA Sales Manager
Connor joined Cox in 2019 as a Preventative Maintenance Sales Representative over the past six years, he has risen to Preventative Maintenance Sales (PMA) Manager. In this new role, he manages the PMA team, leading the strategic sales plans while closely monitoring the current market. Outside of work Connor spends his time with his wife and two children. He enjoys playing hockey and during the nice weather you can find him on the ocean or the golf course.
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Keith Reissfelder
Service Manager
Keith became a member of Local 537 Refrigeration division in 1993. He worked in the field as a service technician for 21 years before accepting the Service Manager position for Cox in 2014. He has been instrumental in building the service department from 16 technicians to approximately 60 current field personnel. Carrying on the tradition of hiring talented people that fit the Cox culture is a big part of the success of this great team. Keith enjoys time with family and friends boating, taking sunset cruises, and enjoying the outdoors at his family lake house.
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