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Typical Greater Boston range for this kind of work, from regional averages — not a quote from Coastal Mechanical. 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
Mini splits come up again and again. Since April, Google reviewers have described Coastal Mechanical installing them in a Harwich home, a Truro condo and two other homes, and one recent account followed a single install from an emailed quote request through Rob's estimate visit to Kevin's crew doing the work. The South Yarmouth company says it was founded in 2017 as a small family operation on Cape Cod and now runs in-house HVAC, plumbing and electrical divisions with about 20 year-round employees, with no subcontracted work. Its site names James Nolan as business manager and Robert Woodbury as VP of HVAC, and lists a service area running from Bourne and Falmouth out to Truro and Wellfleet. Google shows a 5-star average across 458 ratings. The electrical and plumbing sides turn up in the reviews too. An April 2026 reviewer had the company outfit a new home for heat, air conditioning and electric, with zoning advice for the thermostats and diagrams for placing switches and outlets; a February 2026 reviewer had lighting updated in a remodeled kitchen area; a March 2026 review praised a plumber named Jeff. Service calls draw similar comments — in July, a customer whose AC failed on a 97-degree Sunday got a text back the same day and had Brendan restore the cooling on Monday. Older accounts cover bigger heating work: a March 2024 review described an oil-to-gas conversion with a new boiler, removal of a corroded oil tank, coordination with the gas company and the Mass Save paperwork, and a January 2024 review described a heat pump install with duct repairs and a new zone. Some jobs went less smoothly. In a February 2026 review, a customer who paid for two second-floor zones said the air handler surged from the start, several return trips did not fix it, and they were left with one working zone and leftover ducting and dampers. A late-March 2026 reviewer on a maintenance contract said the technicians showed little interest in a front bedroom and bathroom that were not getting heat. And in November 2025 a customer objected to the office's plan to charge $185 an hour to pick up two parts the customer said were available at local supply houses.
I was very pleased with the work Coastal Mechanical did for me. They were on time, neat, personable and reasonable. They took what I thought was a complicated job and completed it within one hour. High recommend!!
Coastal Mechanical just installed an AC unit at our salon, and our installer was Kevin, and he did an incredible job. He was prompt, professional, efficient, and clearly knows his craft. Our salon is finally nice and cool, and the entire process was seamless.
Professional, on time, cleaned up and answered all questions and checked in each day during the installation of our new mini split system. Thank you
Great company to work with. Every employee i have spoken to has been very professional and always willing to help. A must call for all of your HVAC, Electrical, Plumbing and Generator Installation needs.
First class service. AC went out on Sunday - 97 degrees. Left voice mail and received text same day - Brendan arrived on Monday and was extremely knowledgeable and professional. AC was on Monday and all grandkids were very happy.
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Certified attributes are verified against the public registry. Others are the business's own statement.
1 change recorded — last scanned Aug 8, 2026.
Transparent diagnostics5.0
Broad plumbing and HVAC range5.0
Repeat, years-long customers5.0
Water heater and boiler installs5.0
Two AC technicians out within a few hours5.0
Long family history2.7