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Verified record
In February 2026 a one-star Google reviewer wrote that Top Notch Heating & Air Conditioning does not pick up calls and that its services are slow; in January 2025 another one-star reviewer wrote that the call "disconnects after 1 ring" after several tries. In February 2022 a five-star Google reviewer called it the only heating company that answers his phone and goes out of his way to help with furnace work. The company holds a 4-star Google average from nine ratings. Maine's licensing registry lists HVAC license MS30005698 as active, with Ronald E. Overlock Sr as the holder of record.
They have no online access that mean they dont have website and they dont pickup calls their services are slow genuine advice you must focus on building you website!!! thank you so much.
Call disconnects after 1 ring I tried several times
Excellent. I was dealing with a leaky cast iron heater for weeks with another company, who after 3 visits, nearly $300, and a last minute appointment cancelation did not resolve my issue. I called Black Diamond and they came out and fixed my issue the SAME DAY and consulted on two separate issues. I'm thrilled.
The only Heating Company that answers his phone and goes out of his way to help you when your in need of furnace work!
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2 changes recorded — last scanned Oct 30, 2026.
Typical Maine range for this kind of work, from regional averages — not a quote from Top Notch Heating & Air Conditioning Bangor. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$4,500 – $10,300
Typical HVAC project around $7,400
Same-morning boiler repair3.9
