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NJ Niemann HVAC is a Charlton heating and cooling company that, by its own account, was started by Nathan Niemann in 2021 and serves Central Massachusetts homeowners' HVAC needs. The website credits Nathan with 10+ years of experience in the HVAC field and names a service area of Charlton, Oxford, Dudley, Auburn, Worcester, Shrewsbury, West Boylston, Boylston, Holden, Webster, Douglas and Rutland. It holds 5 stars from 3 ratings on Google. In a 2024 review, a customer whose AC unit stopped working said Nathan was their 3rd estimate, spent multiple hours diagnosing the issue, and that they saved over $10k by not going with the big named local companies. In a 2023 review, a customer said Nathan and Hannah serviced their furnace and AC and called them efficient, professional and completely trustworthy.
It was the end of summer when our AC unit decided to stop working, Nathan was our 3rd estimate because the two prior to him had differing recommendations. He spent multiple hours diagnosing the issue and providing his professional opinion as to what we should do. We saved over $10k not going with the big named local companies. He was organized, quick to respond and made us a priority. Super grateful for his wife who responded to my sos message on the local Moms Facebook page. Thanks Nathan!
Nathan and Hannah serviced the furnace & AC. They were efficient and professional and completely trustworthy.
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1 change recorded — last scanned Sep 27, 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from NJ Niemann HVAC, INC. 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
