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License verifiedSeibold Plumbing & Heating Inc
Water heater replaced in four hours2.6
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J L De Marco Heating & Air Conditioning is an HVAC company in Holden. In a 2024 review, a customer said the company installed an HVAC system in their mother's house that had had nonstop issues for the past 2 years, and that other HVAC companies who looked at it wondered why the duct-work and zones were installed the way they were. The same 2024 reviewer said a 2 stage condenser was set up to run with a 1 stage furnace, and that when they asked the owner, Jim, to come look at the work, the response was "It'll be $200 just to come look at it and I have no idea when I'll be able to get there," followed by months without hearing from the company. A 2022 review praised a good price and work done quickly and professionally. In a 2021 review, a customer described quick, clean and professional service.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from J L De Marco Heating & Air Conditioning. 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
Horrible experience, they installed an hvac system in my mothers house, which has had nonstop issues for the past 2 years. Had multiple other hvac companies come to us bewildered after looking at it wondering why the duct-work and zones were installed the way it was and made no sense. They setup a 2 stage condenser to run with a 1 stage furnace, this with the bad duct work limited the condenser to only run at 60-70% capacity. This leads to the condenser not starting and running poorly when it does start on humid days. When we reached out to have the owner Jim come look at his companies work we were met with responses of "It'll be $200 just to come look at it and I have no idea when I'll be able to get there." along with a very poor attitude the whole time. After that it was crickets from them for months when all we wanted was for them to come take a look since they installed the system that is now having a bunch of problems and is only 3 years old
Good price done quickly and professionally
The only HVAC company I’ll ever call. Quick, clean, and professional service.
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2 changes recorded — last scanned Sep 26, 2026.
Water heater replaced in four hours2.6
