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Typical your area range for this kind of work, from regional averages — not a quote from Nadeau 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
Nadeau Mechanical describes itself on its BBB page as servicing, maintaining and installing heating, cooling and ventilation units. A recent Google customer said Andre did some gas supply line changes on a job that also needed two boilers disconnected and the hot water tank reconnected, and called his pricing very reasonable. Andre M. Nadeau's New Hampshire HVAC licence, number GF1507881, is active on the state registry. He also holds a Maine HVAC licence, number PNT14449, which is active on the Maine registry. A 2025 customer said Andre and Joe arrived on time with the duct components and new thermostats for an extensive basement HVAC project, which was completed in four days. A 2025 reviewer with a mid-1800s home said the company replaced two aged A/C condensing units with heat pumps, replaced the two air handlers and added controls to work with a new natural gas boiler. That 2025 reviewer wrote that the company is based in NH and does a fair amount of work much nearer Boston. In a 2024 review, a customer said Andre and his team installed a full ducted HVAC system in their old farmhouse remodel and gave good/better/best pricing. A 2023 customer said their furnace died four days before Christmas, and that Andre came back and installed a new furnace within 24 hours of the quote, then installed a central AC unit one week later. A 2023 homeowner wanted to move from an old oil burner to a gas forced hot air heat and AC system after a local company said new duct work to the second floor was not possible under a cathedral ceiling; that 2023 customer said Andre looked and said he could do it. In a 2022 review, a customer said Andre was the only one of several companies to find mold in the duct work, and that he replaced the complete unit and the duct. A 2023 customer said Andre replaced all their duct work and installed a heat pump, and that the heat pump began shutting itself off after a month; that 2023 customer said a permanent solution may have taken 4-5 months, and that Andre once drove an hour at 9pm to make sure they had heat. A 2023 customer whose A/C went out gave one star after being told the system likely had a leak and a fused compressor and being quoted $5,000 for a new unit and hose install; that 2023 customer said a second opinion ended with a new capacitor for a total of $250, and the A/C was going strong 30 days later.
Andre was excellent all the way around. Contractors who answer the phone and show up promptly means a lot these days. I highly recommend Nadeau Mechanical for your projects! Andre did some gas supply line changes. I needed two boilers disconnected. And the HW tank reconnected. His pricing was very reasonable. Boiler pictures to show what needs to go away. The 2 pipe steam system is prehistoric.
Nadeau Mechanical is well represented by Andre and Joe. We contracted for an extensive HVAC for a basement using the existing main floor system. The estimate was detailed and a date set. Andre and Joe arrived on time with all the required duct components and new thermostats. The project was completed in four days without any issues. Excellent work at a fair, negotiated price. Highly recommended.
I’m writing to very strongly recommend Nadeau Mechanical and its owner, Andre. This is based on the work they recently did in updating our 25-year-old HVAC system. Andre was originally recommended to me word-of-mouth by the head of a well-regarded contracting company that does a good deal of restoration (our home dates from the mid-1800s). His description included things like “smart, energetic, easy to communicate with, does good work”. That’s been completely confirmed by my recent experience with Nadeau in replacing two aged A/C condensing units with heat pumps, removing and replacing the two corresponding air handlers, and adding controls to make these play nicely with a new natural gas boiler being installed as backup. The price was quite competitive compared with the other quotes we initially got. It struck a good balance between replacing worn out mechanicals and keeping newer ones that didn’t need to go. Installation quality appears to me excellent. Nadeau managed both technical issues and an extensive bag of unanticipated new local permitting rules without the project falling behind in schedule. While they are based in NH, they do a fair amount of work much nearer Boston and this has proved in no way a problem. Overall, a very positive experience.
Andre and his team installed a full ducted HVAC system start to finish in our old farmhouse remodel and did a fantastic job. He was a wizard with the duct work and executed flawlessly given the challenging situation and space constraints. Quotes and pricing were super fair, gave us easy to understand good/better/best pricing - he even continues to check in to make sure the system is working as intended. Cant recommend him enough!
Andre and his crew were very efficient and professional. Great work quality and communication with other trades on a project they did for me. I highly recommend them for your Hvac needs.
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1 change recorded — last scanned Oct 18, 2026.
Whole heating system replacement4.5
Stayed until 7:50 PM to finish a hot water tank job4.1
21 years in business3.7
Same-day sump pump replacement3.5