Your Trusted Plumbing, Heating and Air Experts in Nashua, NH
Since 1987, GSMS has been proud to offer top-notch HVAC and plumbing services to residents of Nashua, NH. With over three decades of experience, our family-owned business has built a reputation for excellence, reliability, and outstanding customer service.
Need AC repair, a local plumber or better indoor air quality for your home? Call 603-424-8258 to schedule your HVAC and plumber service or contact us online with any questions 24 hours a day.
Expert HVAC Service
We provide a comprehensive range of HVAC services, including air conditioning repair, replacement, and HVAC maintenance, as well as heating repair and installation services for furnaces and boilers. Our expert HVAC technicians are also skilled in installing and maintaining ductless mini-split systems, ensuring that your home stays comfortable year-round.
Heating and AC Repair and Replacement
At GSMS, we use only the highest quality products from leading manufacturers, guaranteeing efficient and long-lasting solutions for your heating and cooling needs. Whether you need a quick repair, a complete system installation, or regular maintenance, our team is dedicated to providing personalized service tailored to your specific requirements.
Don't let HVAC issues disrupt your comfort—call GSMS today at 603-424-8258 to schedule your AC repair or heating service in Nashua and experience the difference of working with trusted local professionals.
Local Plumbing Services
In addition to our heating and air conditioning services, we offer top-quality plumbing services to the residents of Nashua. With over three decades of experience, our family-owned business has established a reputation for trust, reliability, and exceptional customer care.
Water Heater Repair and Installation
Our local plumbing services include water heater repair, replacement, and maintenance for both tank and tankless models, ensuring your home has a consistent supply of hot water. We also specialize in kitchen plumbing, from faucet and sink installations to dishwasher and water line services.
In the bathroom, our expert plumbers handle everything from toilet and shower repairs to vanity plumbing and pipe replacement. We use only the highest quality materials and the latest techniques to provide efficient and long-lasting solutions for your plumbing needs.
Get the Best Plumbers
Don't let plumbing issues disrupt your daily routine—call GSMS today at 603-424-8258 to schedule your plumbing service in Nashua and experience the peace of mind that comes with working with trusted local professionals.
Don't belive us, see what your neighbors are saying about our HVAC and plumbing services below!
Recent Jobs and Reviews in Nashua, NH
Customers say: The recent reviews exhibit a predominantly positive sentiment, with recurring themes of satisfaction, professionalism, and expertise. Customers express gratitude, recommend the company, and acknowledge the quality of the work performed. Positive reviews frequently mention friendly and knowledgeable technicians, timely responses, and efficient service. Negative reviews are minimal and do not represent a clear, recurring trend. Overall, the reviews suggest a positive experience with the company, with many customers expressing satisfaction with their HVAC and plumbing needs.
Our Local Reviews by City
- Amherst, NH (9)
- Atkinson, NH (2)
- Auburn, NH (1)
- Barrington, NH (21)
- Bedford, NH (27)
- Candia, NH (2)
- Chester, NH (2)
- Concord, NH (6)
- Deerfield, NH (1)
- Derry, NH (2)
- Dover, NH (1)
- Durham, NH (2)
- Epping, NH (1)
- Gilford, NH (1)
- Gilmanton, NH (1)
- Goffstown, NH (7)
- Greenland, NH (2)
- Hampstead, NH (2)
- Henniker, NH (3)
- Hillsborough, NH (1)
- Hollis, NH (12)
- Hooksett, NH (12)
- Hudson, NH (6)
- Lee, NH (1)
- Litchfield, NH (3)
- Londonderry, NH (12)
- Manchester, NH (46)
- Merrimack, NH (33)
- Milford, NH (6)
- Moultonborough, NH (1)
- Nashua, NH (41)
- New Boston, NH (3)
- Newbury, NH (1)
- Newmarket, NH (2)
- Northfield, NH (1)
- Northwood, NH (1)
- Pembroke, NH (1)
- Raymond, NH (1)
- Rochester, NH (2)
- Salem, NH (3)
- Sandown, NH (2)
- Stratham, NH (5)
- Tilton, NH (1)
- Weare, NH (5)
- Windham, NH (7)
- York, ME (1)
Job Locations and Reviews

Removed kitchen floor to install new hot and cold water lines also moved kitchen drain and installed 2" check on basement washing machine/sink line



I completed the furnace maintenance today. The air filter is a one year air filter so that didn’t need to be replaced since it was replaced in the spring time. I flushed the trap and condensate pump with cleaner. I cleaned the flame sensor. I checked all the wiring connections and everything looked good. I checked incoming and outgoing gas pressures and everything was according to manufacturer specifications. When I was completing the combustion analyzing test, I saw that the CO levels in the exhaust pipe were out of manufacture specifications. I discovered that there was debris in the intake pipe. I cut out two sections of the flue pipe and cleaned out all of debris. I tested system operation in high fire again and the CO levels were under 100 PPM which is what the manufacturer wants.



Installation of a three-zone mini-split system to provide cooling and supplemental heating to the home. The outdoor unit will be placed on the gable end on a unit stand. We will level off the ground area with cement blocks to create a flat, level surface for the outdoor unit. One indoor unit will be installed in the first-floor TV room. A second unit will be installed in the kitchen, above the location of the existing in-wall A/C unit. A third unit will be installed in the upstairs bedroom. Some additional airflow will reach the hallway area and bathroom, but the primary room for cooling will be the upstairs bedroom. We will coordinate with our carpenter, Scott Woodbury, to come in to frame and remove the existing in-wall A/C unit. A new piece of drywall will be added and sanded, but the client will be responsible for matching the existing wallpaper. Alternatively, we can install the mini-split so that it will not be in the way of the existing window unit. A new electrical panel w



Completed the gas boiler and gas water heater maintenance. The client said her upstairs toilet runs constantly so the internals should be replaced. I have a picture added in the notes of the toilet.

Replace thermostat.

After doing a bunch of tests on the unit, we came to the conclusion that the gas valve had been sticking due to sitting over the winter time. I cycled the unit over 20 times by the last 10 times the unit wasn’t having any issues. I let the client know that if any issues come up again to please reach out to us.



Install gas stove for kitchen and found bad Rinnai that had to be red-tagged. Will send over quote for repair versus replace.



I completed the furnace maintenance today. I replaced the air filter with a 20 x 25 x 5 air bear filter. I pulled the flame sensor and cleaned it. I flushed the trap and condensate pump with cleaner. I replaced the humidifier pad and turned it on for winter. I checked all the wiring connections and the blower motor capacitor and everything looked good. I checked incoming and outgoing gas pressures and everything was according to manufacture specifications. lastly I ran the unit and performed a combustion analyzer test to check for CO, CO2 and oxygen levels and everything was running great. The client mentioned that her grandson said the water was too hot so I adjusted the mixing valve and got the temperature to around 125°.

Did home club pm on both boilers.first floor gas meter was shut off by gas company for new meter and never turned on

Installed new Delta tub and shower valve
Great service , personality and thorough
Mark and team are always outstanding!
Great Company
Professional and courteous service. Mark explained all the work that needed to be done so there were no surprises. The work was top notch and I would definitely recommend Mark to any neighbor who is in need of plumbing services
Excellent Service
Service people were very courteous.
Very courteous and polite. Service went as expected
The hot water tank leaked resulting in lots of water in the basement. Adam removed the old tank and installed a new one. The install looks great and got hot water back.
Always amazing service!!
Very knowledgeable and professional
top notch service, always professional. would recommend to anyone needing HVAC service, repair or install.
It was a pleasure serving you and your family. Thank you for sharing your kind words with us. It means the world to us and to our entire team!