Name: GSMS - Great Service Makes Sense
Address: New Hampshire, US
Telephone: 603-424-8258
Price range: $$

HVAC and plumbing services in Henniker, NH

From the historic homes along the Contoocook River to the newer builds out toward Pats Peak and New England College, Henniker homeowners count on their heating, cooling, and plumbing to hold up through long Merrimack County winters and warm summers. GSMS is proud to serve the only Henniker on Earth with the same family-owned care we have brought to New Hampshire homes since 1987.

Henniker's mix of older farmhouses, in-town homes, and rural properties on private wells means comfort systems here face a little of everything, from aging furnaces and boilers to hard well water and homes that are tricky to cool evenly. Whatever your home needs, our Specialists handle heating, cooling, water heaters, plumbing, and water treatment for the Henniker area and the greater Concord region just up Route 114 and I-89. Give us a call at 603-424-8258 or schedule service online.

Heating services in Henniker

Henniker sees real winter, so dependable heat is not optional. GSMS installs, repairs, and maintains the heating systems local homes rely on, whether you heat with a gas or propane furnace, a boiler, or a heat pump.

Our heating and cooling Specialists handle everything from a no-heat emergency to a planned upgrade. Explore furnace repair, furnace installation and replacement, and seasonal furnace maintenance, along with boiler installation and replacement for the many older Henniker homes that run on hydronic heat. Curious whether a heat pump could heat your NH home? We can walk you through it.

Cooling services in Henniker

When summer arrives, GSMS keeps Henniker homes comfortable with reliable cooling that fits how your house is built. We offer AC repair, AC installation, and AC maintenance for central systems.

For Henniker's older homes and additions without existing ductwork, a ductless mini-split is often the smartest way to add cooling (and efficient heating) room by room. As a Mitsubishi dealer, we install Mitsubishi mini-split systems sized for your space.

Water heaters in Henniker

No hot water is never convenient, especially in a Henniker winter. GSMS repairs, replaces, and installs every type of water heater. Compare options across water heater replacement, high-efficiency tankless water heater installation, and energy-saving heat pump water heater installation. Our Specialists help you choose the right unit for your household size and fuel type, then install it correctly the first time.

Plumbing services in Henniker

From dripping faucets and running toilets to leaks and clogged drains, our plumbing Specialists keep Henniker homes running smoothly. We handle kitchen and bathroom plumbing, fixture repair and installation, water lines, and pipe repair, backed by upfront pricing so you know the cost before we start.

Well water and water treatment in Henniker

Many Henniker homes sit on private wells, which can mean hard water, sediment, iron, and other local water concerns that wear on your plumbing, fixtures, and appliances. GSMS helps you find out exactly what is in your water and fix it. Explore whole-home water quality services, water filtration systems, water softeners for hard water, reverse osmosis drinking water systems, and sediment filtration. This is one of the most valuable upgrades a rural Henniker home can make.

Indoor air quality in Henniker

Tightly sealed winter homes can trap dust, dryness, and allergens. GSMS improves the air your family breathes with indoor air quality solutions, from whole-home humidifiers to advanced air purification.

Why Henniker homeowners choose GSMS

Family-owned and serving New Hampshire since 1987, with the Great Service Promise behind every visit.
A Lennox Premier Dealer and Mitsubishi dealer, BBB accredited with an A+ rating and a 2026 BBB Torch Award for Ethics.
Whole-home expertise across heating, cooling, water heaters, plumbing, and water treatment, so one call covers it.
Priority service and routine maintenance through the Home Club, plus flexible financing on larger projects.
Proud to give back to the communities we serve through our We Love Local program.

Henniker service area FAQs

Do you offer HVAC and plumbing services in Henniker, NH?

Yes. GSMS serves Henniker and the greater Concord area with full heating, cooling, water heater, plumbing, and water treatment services. Call 603-424-8258 or request service online to schedule.

Do you service Henniker homes on well water?

Yes. Well water is common in Henniker, and we test for hard water, iron, sediment, and other concerns, then recommend the right water treatment solution for your home.

Do you install heat pumps and mini-splits in Henniker?

Yes. Ductless mini-splits are a great fit for Henniker's older homes and additions, and we can advise whether a heat pump makes sense for your heating and cooling needs.

What should I do in a heating or plumbing emergency in Henniker?

For a plumbing leak, shut off the water to the affected fixture or your main shut-off, then call GSMS at 603-424-8258 right away. For a no-heat call in winter, reach out as soon as possible so we can get a Specialist to you.

Do you offer financing for Henniker homeowners?

Yes. Ask about financing options and current rebates to make larger heating, cooling, and plumbing projects more affordable.

Recent Jobs and Reviews in Henniker, NH

Rated 5.0 out of 5 stars based on 3 customer reviews

Customers say: The overall sentiment is overwhelmingly positive, with customers expressing high satisfaction and strong loyalty. A recurring theme is professionalism: technicians are consistently described as knowledgeable, courteous, friendly, and personable, and many reviewers appreciate their willingness to patiently answer questions and explain the work being done. Punctuality and efficiency come up often, with customers noting that appointments were kept, issues were diagnosed quickly, and work was completed thoroughly. Many also praise the company's responsiveness and communication, including a helpful office team, a smooth scheduling process, and a willingness to accommodate urgent needs. Fair pricing, quality installations, and careful, tidy work habits add to the favorable impressions. Longtime customers describe consistently excellent experiences, while first-time customers express being pleasantly impressed. Many say they plan to keep using the company for maintenance and future projects and would readily recommend it to others, reflecting a strong sense of trust and appreciation.

Henniker, NH at a glance

GSMS Air•Heating•Plumbing has completed 17 jobs in Henniker, NH between August 2024 and August 2026.

The 4 customer reviews shown here average 5.0 out of 5.

The most recent job was on August 19, 2026.

GSMS Air•Heating•Plumbing has completed 8 jobs in Henniker, NH in the last 12 months. The first job there was in August 2024.

Our Local Reviews by City

Job Locations and Reviews

Review

Louise Cyr - Henniker, NH 03242 76 days ago

Jack D. Checked in 76 days ago

Replace 4 piece kitchen faucet.

Henniker, NH 03242

Henniker, NH - Check kitchen faucet found diveter plugged,recommend new faucet.Removed fill valve in master bath toilet and adjusted water level.Removed hot and cold water lines in basement faucet and cleaned screens.

Mark D. Checked in 110 days ago

Check kitchen faucet found diveter plugged,recommend new faucet.Removed fill valve in master bath toilet and adjusted water level.Removed hot and cold water lines in basement faucet and cleaned screens.

Henniker, NH 03242

Mark D. Checked in 126 days ago

Checked air filter, condensate trap both ok.Filter is schedule 10/20/26 to be changed.cleaned air exchanger filters.Wash outdoor coil everything checked out fine

Henniker, NH 03242

Mark D. Checked in 187 days ago

Replaced outside faucet.Drop off 12 water filters and 3 airfilters

Henniker, NH 03242

Qwentin G. Checked in 188 days ago

Completed the mini split maintenance and the central air conditioning maintenance. Everything looked great! Please see the attached forms.

Henniker, NH 03242

Jack D. Checked in 231 days ago

Replace filter housing.

Henniker, NH 03242

Qwentin G. Checked in 257 days ago

Replacement of OEM anode rod for Heat-Flo indirect tank. Also ordered a set of filters for the reverse osmosis system.

Henniker, NH 03242

Completed the plumbing visit today. I started off with draining down the indirect water tank. I pulled the anode rod and found that it was completely destroyed. We will order a new one today and get you on the schedule as soon as it comes in. I checked the expansion tank and that was good. I inspected the fixtures and drains and everything looked good. The client would also like us to bring filters for his RO system.

Qwentin G. Checked in 265 days ago

Completed the plumbing visit today. I started off with draining down the indirect water tank. I pulled the anode rod and found that it was completely destroyed. We will order a new one today and get you on the schedule as soon as it comes in. I checked the expansion tank and that was good. I inspected the fixtures and drains and everything looked good. The client would also like us to bring filters for his RO system.

Henniker, NH 03242

Jack D. Checked in 390 days ago

Boiler PM on Ideal boiler. Everything went great. New air filter and new steam Humidifier canister. Thank you!

Henniker, NH 03242

Review

Excellent service

Luc - Henniker, NH 03242 496 days ago

Jack D. Checked in 496 days ago

AC PM performed today. Replaced air filter. No issues. Thank you!

Henniker, NH 03242

Mark D. Checked in 575 days ago

Install new toilet

Henniker, NH 03242

Review

Great service

Luc - Henniker, NH 03242 600 days ago

Jack D. Checked in 600 days ago

Your homeclub plumbing visit was completed today. I tightened one drain connection and fixed the wobbly master bathroom shower hander. Thank you.

Henniker, NH 03242

Adam P. Checked in 680 days ago

Move Mitsubishi unit around the corner

Henniker, NH 03242

Jack D. Checked in 721 days ago

The heating maintenance on your Lennox Signature Series propane furnace went well. There are no necessary repairs that we discovered. We replaced the whole home water filter today.

Henniker, NH 03242

Review

Excellent

Luc - Henniker, NH 03242 725 days ago

Jack D. Checked in 725 days ago

The GSMS HomeClub heating visit went well. New air filter and boiler inspected + cleaned. Boiler water treatment added to system. Magnetic filter opened and cleaned. Thank you! We will schedule an estimate for a mini split style system for your bedroom.

Henniker, NH 03242

Qwentin G. Checked in 806 days ago

I started off with washing the outdoor unit. There was a lot of pollen on the coil so I started off with using a brush to get it off. I then rinsed it out with water and soap. I checked electrical connections and everything was good. Then I went inside and I changed the air filter which Luke supplied and I vacuum the air filter box. I then cleaned the coil inside and flushed the drain with drain cleaner. I checked indoor electrical connections and everything was good as well. I ran a system pressure check and everything was perfect.

Henniker, NH 03242

Qwentin G. Checked in 806 days ago

I started off with washing the outdoor unit. I cleaned it with soap and water. Then I checked all the electrical connections and everything looked good. I then went inside and I cleaned the indoor coil with Dawn soap. I Flushed the trap with drain cleaner, vacuumed the air filter box and changed the filter supplied by the client. The electrical connections looked good. I did an overall system pressure check and the pressures were good. The client asked me to change out her sediment filter with a supplied filter by her so I changed it out.

Henniker, NH 03242