Denary Plumbing Heating & Cooling

Ask around Nashua for a plumber and Denary Plumbing, Heating & Cooling comes back to one name: Dennis, the owner, whom many reviewers say shows up and does the work himself. The company, family-owned and self-reported at over 20 years in business, handles both plumbing and heating/cooling work — water heaters, furnaces, mini-splits, drains — for homes and businesses around Nashua, NH, with financing available. Its Massachusetts plumbing license is active on the state registry, and it's also listed as an NH & Mass Saves partner. The jobs described range from quick fixes to full installs. He's replaced a washer's water supply valve after a fast response to photos of the problem, fixed an air conditioner during a summer heat wave and came back to handle other plumbing issues at the same house, and installed a whole-house water filtration system that one customer credited with changing the taste, smell and hardness of their water. On the heating and cooling side, he's replaced a full HVAC and furnace system on what one reviewer called a large, reasonably priced job, installed a mini-split during a rainstorm without tracking dirt or water through the house, and — in a February 2026 review — handled routine furnace maintenance, explaining the condition of the system clearly. He's also fixed a leak under a vanity sink that another plumber had turned down, replaced water heaters and drain lines, and installed kitchen fixtures like sinks, faucets and garbage disposals during a remodel. Several reviews single out how fast he responds — arriving within two hours of a first call, setting an appointment within ten minutes, and fixing a broken outdoor shower the same day it was reported. Pricing is called fair or reasonable in a number of reviews, and several customers say they plan to call him again for future work. One reviewer noted that his schedule kept him from helping right away on a first request, though he returned sooner than expected on the next call. This is a strong call for anything from a leaky faucet to a mini-split or furnace replacement — worth confirming his current availability for larger jobs given how in demand the reviews make him sound.