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Typical your area range for this kind of work, from regional averages — not a quote from DeFosses Plumbing & Heating. 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
DeFosses Plumbing & Heating lists gas and oil radiant and baseboard heating, gas direct-vent space heaters and wall furnaces, gas piping, water heating systems, water filtration and bathroom remodeling among its services on its own website. The company says it has been in business for 40 years. Raymond A Defosses, Jr holds New Hampshire HVAC licence GFE0700140, active on the state registry. A 2022 customer said Ray responded right away to every follow-up question about their new propane heaters, and that the installation was done without delay. The same 2022 customer wrote that Ray called the next day, after the propane company's visit, to make sure all was in order. A 2021 customer said they came the next day to repair a propane monitor and called the price reasonable. A 2025 customer said calls and messages went unanswered, and an emailed reply said they could not help without really explaining why. A 2025 reviewer wrote that he was very rude and refused to do an estimate on a big job because he didn't like the previous owner of the building. On Google the company holds 4.5 stars from 17 ratings, and its Better Business Bureau grade is A+.
Called a couple of times, left messages with no response. Then made a request via their website. They responded via email saying they can’t help while not really explaining why . I can’t believe they are a preferred Rinnai service provider!
Was very rude and refused to do an estimate on a big job because he didn't like the previous owner of the building
We are thrilled with every aspect of our new (propane) heaters, but we are particularly grateful for the responsiveness and professionalism of the DeFosses at every stage. The initial site visit was extremely thorough and informative, yet every time I had a follow-up question (or 10!), Ray responded right away and spent as long as necessary walking me through the workings of the mechanism or the logic of the venting or the rationale for the placement to make sure every concern was addressed. The installation itself was performed expertly, with professionalism, and without delay. Afterward, having taken note of when the propane company was coming to install the tanks and activate the heaters, Ray called the next day to make sure all was in order. Moreover, he had been absolutely right about everything. We are delighted with our new heating system and amazed and grateful for the wonderful customer service.
They came the next day and repaired my propane monitor. Grear job and price was reasonable. Will recommend them. Also been in bussiness for 40 years. Very experienced. Merry Christmas🎅
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1 change recorded — last scanned Oct 18, 2026.
Mini split installed in a single day3.4
State-verified HVAC license since 20102.9
A same-day boiler visit4.8
Heat repaired four hours after the call4.6
Boiler repair a few hours after a text4.5