GSMS Air•Heating•Plumbing

Granite State Mechanical Services holds a perfect 5.0-star rating across 234 verified client reviews in Manchester, New Hampshire. As a second-generation family-owned business, GSMS Air Heating Plumbing has earned its reputation one referral at a time across the greater Nashua region. The company serves residential and light commercial clients throughout Manchester, Nashua, Merrimack, Hooksett, Hollis, and Barrington, answering to local homeowners rather than distant shareholders.

GSMS distinguishes itself as an authorized Lennox dealer offering rebates up to $1,800 on qualifying equipment purchases, complemented by 0% interest financing options. Their specialists install Energy Kinetics boilers and Mitsubishi mini-split heat pump systems, variable-speed heat pumps ideal for New England winters. The company backs all furnace and boiler installations with a Red Square Finish standard, and maintains an indoor air quality division featuring REME HALO air purification systems alongside whole-home water filtration and softening solutions.

Reviewers consistently highlight technician Quentin, who spent hours diagnosing a troublesome furnace issue rather than replaced unneeded components, and technician Jack, who arrived same-day during a snowstorm to restore heat within hours. The team's approach, explaining findings in plain language and respecting the homeowner's budget, appears repeatedly across client feedback.