Your Local Plumbing & HVAC Experts in Litchfield, NH
Homeowners in Litchfield, NH, count on GSMS for dependable plumbing, heating, and cooling services. As a family-owned company, we bring decades of experience and a neighborly approach to every service call. Whether you’re looking to upgrade to a ductless system, need a new water heater, or have a plumbing emergency, our licensed team is here to make your home comfortable again.
Schedule your service today by calling 603-424-8258 or request an appointment online.
Ductless Mini-Splits: The Smart Choice for Litchfield Homes
As a Mitsubishi Electric dealer, we specialize in high-efficiency ductless mini-split systems designed for New England homes.
- Room-by-Room Comfort: Control heating and cooling independently in different areas of your home.
- Energy Efficiency: Cut utility costs with inverter technology and zoning features.
- Flexible Installation: Perfect for homes without ductwork, additions, or finished basements.
- All-in-One Solution: Provides both heating and cooling, keeping your home comfortable throughout the year.
If you’re in Litchfield and looking for a modern, efficient alternative to traditional systems, our team can recommend the ideal Mitsubishi ductless solution for your space.
Plumbing Services for Litchfield, NH
Plumbing problems can disrupt daily life quickly. That’s why GSMS offers full-service plumbing solutions designed to keep your home’s water flowing smoothly and reliably.
Water Heater Repair & Installation
Our plumbers service both traditional and tankless water heaters, restoring hot water fast when you need it.
Whole-Home Water Filtration
Protect your plumbing and enjoy better-tasting water with custom water filtration and reverse osmosis systems built for your home.
Plumbing Repairs & Installations
From leaky faucets to broken fixtures, our licensed plumbers provide reliable solutions for any issue.
Heating & Cooling Services in Litchfield
Keeping your home comfortable in New Hampshire’s changing seasons means having reliable heating and cooling systems. Our technicians are here to handle everything from urgent repairs to complete system replacements.
Furnace & Boiler Services
Stay warm in Litchfield winters with expert furnace and boiler repair, replacement, and maintenance.
Air Conditioning Repair & Installation
Beat the summer heat with AC repairs and replacements designed to keep your home cool and efficient.
Indoor Air Quality Solutions
From air purifiers to humidity control, we help you create a healthier home environment.
Why Litchfield Homeowners Choose GSMS for Home Comfort
As a family-owned business serving Southern New Hampshire, GSMS is trusted by homeowners throughout Litchfield, NH for honest, reliable service. Whether you’re near Campbell High School or along Albuquerque Avenue, our technicians know the unique needs of the community and deliver solutions that last.
- Mitsubishi Electric dealer specializing in ductless mini-splits
- Full-service plumbing, heating, and cooling solutions
- 24/7 emergency service for peace of mind
- Licensed, insured, and highly trained local technicians
When you need comfort restored fast or want to upgrade your home systems, turn to GSMS — the local team your neighbors trust. Call us today at 603-424-8258 or request service online to get started.
Recent Jobs and Reviews in , NH
At a glance
GSMS Air•Heating•Plumbing has completed 25 jobs in NH in November 2026.
The 25 customer reviews shown here average 5.0 out of 5.
The most recent job was on November 6, 2026.
Recent work covers Nashua, Bedford, Manchester, Merrimack and Amherst.
Our Local Reviews by City
- Amherst, NH (14)
- Atkinson, NH (2)
- Auburn, NH (3)
- Barrington, NH (24)
- Bedford, NH (41)
- Bow, NH (3)
- Candia, NH (3)
- Chester, NH (2)
- Concord, NH (11)
- Deerfield, NH (1)
- Derry, NH (3)
- Dover, NH (1)
- Durham, NH (2)
- Epping, NH (4)
- Exeter, NH (2)
- Gilford, NH (1)
- Gilmanton, NH (4)
- Goffstown, NH (10)
- Greenland, NH (3)
- Hampstead, NH (2)
- Hampton, NH (3)
- Henniker, NH (3)
- Hillsborough, NH (1)
- Hollis, NH (20)
- Hooksett, NH (21)
- Hudson, NH (9)
- Lee, NH (2)
- Litchfield, NH (3)
- Londonderry, NH (17)
- Madbury, NH (1)
- Manchester, NH (78)
- Merrimack, NH (73)
- Milford, NH (9)
- Moultonborough, NH (2)
- Nashua, NH (73)
- New Boston, NH (4)
- Newbury, NH (1)
- Newmarket, NH (3)
- Northfield, NH (2)
- Northwood, NH (2)
- Pembroke, NH (1)
- Raymond, NH (1)
- Rochester, NH (2)
- Salem, NH (4)
- Sandown, NH (3)
- Strafford, NH (1)
- Stratham, NH (15)
- Tilton, NH (1)
- Weare, NH (8)
- Windham, NH (11)
- York, ME (2)
Job Locations and Reviews
2 furnace PM's. The York furnace needs new inducer + collector seals.
RTU Maintenance. New filters + Belts. Replace inducer motor and exhaust piece due to a hole caused by corrosion.
Lennox sent me the wrong part. I found that it most likely is another part causing the issue so we will get the parts ordered as soon as possible.
Qwentin did the annual maintenance on our furnaces. He is professional and thorough. Any concerns that require follow up were noted and photos sent to illustrate what will need to be repaired on a specific furnace.
Oil boiler PM.
Completed the gas furnace maintenance. Everything went great. I replaced the air filter.
Completed the gas boiler maintenance for apartment 42-C. Everything went great.
Furnace PM.
Completed the gas boiler maintenance for apartment 42-A. Everything went great.
Replaced shower cartridge
Replaced basket strainer and order brass basket strainer
Furnace PM.
Highly reccomend replacing oil tank. It is showing it's age and should be an item of concern.
Completed the gas boiler maintenance for apartment 42-1. Everything went great.
With your existing Rinnai boiler officially reaching the end of its serviceable life, this proposal outlines a proactive, direct replacement. Rather than sinking more money into replacement parts for a failing system, we will completely extract the old unit and install a brand-new, high-efficiency ALTA combination ("combi") boiler. A combi boiler is designed to handle both your home's heating and your on-demand domestic hot water from a single, wall-hung footprint. This is an excellent, space-saving solution that provides highly efficient performance. Important Domestic Hot Water Disclosure Because a combi boiler produces hot water on demand without a storage tank, it has a physical limit on how much water it can heat at one time. This system will perform similarly to your previous Rinnai: it is designed to comfortably support a maximum of two hot water fixtures running simultaneously (e.g., one shower and one kitchen sink). If your home features high-flow fixtures, multi-head body
Completed the gas boiler maintenance for apartment 42 B. Everything went great.
Atmospheric vent standing pilot furnace PM. Looks good for its age.
On time professional
Tankless water heater maintenance. Flush heat exchanger with cleaner. Check for leaks. Check incoming gas pressure. Purge cleaner. Inspect vent. Test system. All set, thank you. Paid with check on 11/4.
Unfortunately, I couldn't replicate the lukewarm water issue. Everything checked out with tech support as well. We want to come back out with the Rinnai field rep. We will be in contact with scheduling the date and time.
This apartment must be combined with another apartments boiler.
I wasn't about to get into the apartment. We will have to reschedule.
Reset and RO works well. Next time if an error occurs please take a video of the light sequences at the unit.
Completed the gas furnace maintenance today. I replaced the air filter. Everything went great.
Completed the gas boiler maintenance for apartment #6. Everything went great.
Replace the burner tubes and the collector box.
Completed the gas boiler maintenance for apartment #6. Everything went great.
Great service, friendly and excellent pricing
As always very easy to work with GSMS, professional and timely with no unexpected issues or problems.
Excellent service!
GSMS was quick to respond to my heater issue and scheduled a technician, Jack. He was very knowledgeable and thorough in diagnosing the problem and explained what he did to resolve it.
Friendly and knowledgeable, gets the job done right.
In the twelve years that zI have had the ductless mini splits, never has a cleaning been done that I just experienced. I cannot say enough regarding this young man who went above and beyond and paid attention to every detail. It was a pleasant experience and he had incredible patience with my pup who followed him throughout the house.
Good service and very efficient. Easy to address issues and coordinate appointments.
Qwentin always provides knowledgeable and friendly service.
Great team of people right from Gina who answers the calls to the service technicians and the owners. Extremely responsive to emergencies and customer needs.
Very pleased with GSMS!! Today we had Qwentin who did the fall service on our furnace. Super nice young man that is very polite, professional and very knowledgeable. Would highly recommend GSMS! We could not be happier with this company. 5 star!!!!
Granite State Mechanical Services is the best! I highly recommend them for all your plumbing & HVAC needs!
Qwentin provided excellent service today. He is a very professional and personable young man. Granite State is lucky to have him on their team.
Jack came right on time and figured out my heating problem right away. He got me a new thermostat, installed it and the price was very fair for his time and the new thermostat.
Great service and communication from start to finish. Would highly recommend.
On time, courteous, and efficient.
Showed up when scheduled and did a thorough inspection with diagnosis of two components in our furnace which would cause trouble down the road.
Excellent
Excellence
Excellent!
Qwentin seemed knowledgeable, was very personable, efficient
Always wonderful with Quentin
Overall it was a great experience. From getting the appointment to completion of maintenance, all was smooth.
Great team of technicians keeping my system running both summer and winter
