Verified record
Lavallee Systems is a North Oxford and Sudbury-based plumbing, heating, cooling, water-quality and indoor-air-quality contractor working Central and Eastern Massachusetts, with a stated service area running from Acton and Concord out to Wellesley and Weston. BBB lists it as a 23-employee company owned by Jim Lavallee, with an A+ grade. Its written reviews are few but consistently detailed. A 2025 account of an air-source heat pump install describes a full Manual J load calculation before the technician recommended a system size -- an engineering step homeowners rarely see documented. In a 2023 review, written the week Boston hit its coldest temperature since 1957, a customer credited the company with fixing the setup of a heating system another contractor had installed but never configured correctly, plus a tankless water heater job by the same crew. More recent reviews name specific technicians -- Payton and Devin repairing a 15-year-old central air system, Markez Cotto doing a good job on another visit -- and describe the company as professional and punctual. One thing worth clarifying directly: how long the company has actually been operating. Its website says it was founded in 1991 with 35 years in business, but its BBB profile lists a 2013 start date, and a Procore trade-network listing shows the current entity, Lavallee Systems, resulted from a 2018 name change from a company called EC Mechanical Corporation. The two histories don't obviously reconcile from what's published. For a heat pump sized properly or a botched install from another contractor fixed right, Lavallee's small but detailed review history points the right way -- just ask how the 1991 and 2013 dates connect.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Lavallee Systems. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$5,000 – $11,400
Typical HVAC project around $8,200
“Working at Lavallee Systems: Employee Reviews | Indeed.com ... # Working at Lavallee Systems: 4 Reviews ... ## 4 reviews ... ### Growing and Succeeding with Lavallee Systems ... North Oxford, MA ... Lavallee Systems truly cares about quality work and makes sure everyone, whether in the field or office, gets the training they need. I’ve been with Lavallee Systems for over five years and have seen how the company supports us with hands-on learning, strong leadership, and a focus on doing the job right....Show more ... ### Caring owner really good culture ... I’ve worked for Lavallee systems for”
I work with Jim and Co often on our renovation projects, and they have also done some work in my own home and they do an excellent job. Great plumbers and techs, do recommend
Lavallee Systems recently installed an air source heat pump, and I’m extremely happy with the entire experience. Sam was incredibly thorough with his design process—he performed a full Manual J calculation and used that data to recommend the appropriately sized heat pump for my home. Jon and his team were professional, efficient, and showed great attention to detail throughout the installation. The office staff was also very helpful and ensured that the permit was closed on time.
Lavallee Systems are top notch and really set the bar for HVAC installation companies
Payton and Devin repaired my 15 year old central air system. They were professional and punctual. I highly recommend Lavalle Systems to my friends and neighbors.
Markez cotto is a awsome person he did a great job and he is polite young man
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Established 3.8 rating
Tough diagnostics solved4.8
Fast emergency response4.8
No hard sell4.8
Mini-split and geothermal installs4.0