Lavallee Systems

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.