Verified record
A's 8 is a Medford HVAC shop where one name comes up in nearly every review since 2021: Tenzing, who reviewers describe handling the work personally rather than just dispatching a crew. The company's own site describes AS8 Corporation as a Massachusetts-registered contractor doing heating, cooling, ductless mini-split, and water heater work for homeowners. The written record is small but consistent — eleven Google reviews from 2021 through 2026, every one five stars, with Google's own aggregate at 4.7 from 14 ratings. The recurring job is a full system swap rather than a quick fix: in a 2025 review, a homeowner described Tenzing installing two new HVAC systems and a whole-house dehumidifier during a larger renovation, and another 2025 review described him designing a ductless heat pump and basement dehumidifier setup, fitting the job in between bigger projects so the customer didn't have to wait. A 2024 review described a full radiator-to-heat-pump conversion — two heat pump systems with central air installed across two floors over roughly two weeks. The company also gets called for breakdowns: a 2023 review described the team responding during a cold snap to replace a failed heating system, and a 2021 review described an AC circuit fault traced and fixed within 15 minutes of a technician arriving. What reviewers keep repeating isn't a slogan but a pattern: Tenzing personally walking through the design options, replying quickly to texts, and — as one customer put it — not price-gouging on the bigger installs. Worth asking about before booking: the reviews on file are spread across years rather than a steady stream, so it's worth confirming current lead times for a full system install versus a service call.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from A's 8 Hvac Mechanical Service. 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
“A's 8 are great. https://as8air.com/”
Excellent HVAC service company. Highly recommend.
Tenzing & his crew are the best - everyone he works with is incredibly polite and always goes the extra mile with everything they do. They installed 2 new HVAC systems and a whole house dehumidifier during a major renovation. Highly recommend! Very dependable and quick to reply to any texts.
I cannot imagine a more dependable, honest, and professional HVAC company. Our a/c unit broke in the middle of a heat wave. Tenzing assessed the entire situation and communicated back and forth with the a/c company to make sure that he was choosing the proper system to match the duct work in our house and so that everything would go smoothly when they installed the unit. When Tenzing or his team say they will arrive at a certain time, you can be sure they will arrive AT that time. The installation took 10 hours. They ran into a technical issue and tried to trouble shoot, but the a/c manufacturer was already closed for the day. So they came back to complete the job the next day. The next morning we discovered we did not have hot water. They had to turn the switch to the boiler off to finish the installation. We didn't realize that, called Tenzing, and his technicians were at our house within a half hour to point out the simple problem and turn the switch back on. Honestly, the most patient, polite, and professional people I have ever worked with.
Installed ductless a/c with heat pump and a dehumidifier in the basement. Tenzing came up with a good design and solutions and kindly squeezed us in between bigger jobs so we didn't have to wait. His guys really know what they are doing and work their butts off. Top notch expertise and professionalism. And they do NOT price gouge like other HVAC companies. The best.
I've been meaning to write a review for a year now, Tenzing and his team at AS8 completely renovated our existing heating system last year in June 2023. We went from radiators and no AC, to 2 heat pump systems with central air and heating. The fabulous team worked hard on site for approximately 2 weeks to coordinate removal of old radiators, and install a new duct system on two floors of our home. We now have an amazing system in place and filtered air for heat and cooling. The team was incredibly thoughtful and diligent. The system has been working without trouble for a year now. If anything changes I won't hesitate to call them up!
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Established 4.0 rating
No hard sell4.8
Resolved a stalled Mass Save rebate3.7
Permitted work3.6
Found the real fix, not a $40k replacement3.6
Registry-verified license3.2