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Merrimack, NH

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Residential heating & air conditioning contractor in Merrimack, NH

GSMS is proud to serve the residents of Merrimack, NH, with top-quality heating and air conditioning services. As a family-owned business with over three decades of experience, we are dedicated to providing reliable, efficient, and professional HVAC solutions tailored to your home’s specific needs. 

GSMS is proud to be your Merrimack Lennox Premier Dealer!

Whether it's an emergency repair, a total replacement, or routine maintenance, we have you covered. Call 603-424-8258 today!

Air conditioner repair & replacement

  • AC Repair: We handle cooling problems big and small with speed and attention to detail. Our technicians are trained to troubleshoot and fix refrigerant leaks, thermostat issues, electrical failures, compressor problems, and more. 
  • AC Replacement and New Installation: Time for a cooling upgrade? We offer high-quality systems from Lennox and other leading manufacturers to improve efficiency, enhance comfort, and reduce homeowners' carbon footprint.

Furnace repair & replacement 

  • Furnace Repair: Dealing with a broken furnace? GSMS technicians work efficiently to track down even the smallest of problems and repair them in no time. Common furnace issues we repair include pilot light problems, thermostat malfunctions, ignition system failures, and blower motor problems. 
  • Furnace Replacement and New Installation: Upgrading your furnace takes your home's winter warmth to the next level. Our energy-efficient systems provide consistent heating, reduced maintenance, and enhanced safety. 

Boiler repair & replacement

  • Boiler Repair: Common boiler problems with pressure, thermostats, pilot lights, and leaks, can be a homeowner's nightmare. GSMS technicians work quickly to repair your boiler and get your home warm again in no time. 
  • Boiler Replacement and New Installation: Whether you are considering switching to a boiler system or it's time to replace your existing system, GSMS is here to help you increase efficiency and reliability with advanced units. 

Mini-split heat pumps

GSMS provides comprehensive services for mini-split heat pumps, including installation, maintenance, and repair. We specialize in Mitsubishi ductless units, known for their reliability and efficiency. Whether you’re looking to install a new system or need service for your existing mini-split heat pump, our technicians are here to ensure optimal performance and comfort in your home.

Ductwork cleaning & installation

  • Duct Cleaning: Regular duct cleaning helps improve air quality, increase HVAC efficiency, extend system lifespan, and eliminate odors. We use an advanced Roto Brush system to reach every corner of the ductwork and keep your home clean and comfortable. 
  • Duct Installation: Proper ductwork installation is crucial for airflow, efficiency, comfort, and durability. Choosing GSMS to install your ductwork gives you peace of mind that your new air ducts are safe and secure. 

Merrimack plumbing services

GSMS is proud to provide comprehensive plumbing services to homeowners in Merrimack, NH. Our experienced and professional team is dedicated to delivering reliable and efficient plumbing solutions tailored to your specific needs. 

Quick plumbing repairs, complete installations, and preventative maintenance are what we do best. Call 603-424-8258 today!

Water heater plumbers

  • Repair: Our skilled technicians can quickly diagnose and repair common water heater issues, including inconsistent temperature, leaks, and strange noises.
  • Replacement: When it’s time to replace your old water heater, we offer professional installation of both traditional tank models and modern tankless systems.
  • Maintenance: Regular maintenance is essential to keep your water heater running efficiently. Our comprehensive maintenance services include inspections, cleaning, and tune-ups.
  • Tankless Water Heaters: Upgrade to a tankless water heater for endless hot water, improved energy efficiency, and space savings. We provide expert installation and maintenance for these advanced systems.

Kitchen plumber services

  • Faucets: From repairing leaks to installing new faucets, we ensure your kitchen faucets are functioning perfectly.
  • Sinks: We handle all sink-related services, including installation, repair, and replacement, to keep your kitchen fully operational.
  • Garbage Disposals: Our team can install and repair garbage disposals, ensuring efficient waste management in your kitchen.
  • Dishwashers: We provide installation and repair services for dishwashers, making sure they are properly connected and running smoothly.
  • Water Lines: Whether you need new water lines installed or existing ones repaired, GSMS ensures a reliable water supply for your kitchen appliances.

Bathroom plumber services

  • Toilets: From fixing leaks and unclogging blockages to installing new toilets, we provide comprehensive toilet services.
  • Showers and Tubs: We offer repair, replacement, and installation services for showers and bathtubs to keep your bathroom comfortable and functional.
  • Sinks and Vanity Plumbing: Our team can install and repair bathroom sinks and vanity plumbing, ensuring everything operates seamlessly.
  • Pipe Repairs and Replacements: Whether it’s a minor leak or a major pipe replacement, GSMS provides expert pipe repair and replacement services to prevent water damage and maintain optimal plumbing performance.

Why choose GSMS in Merrimack?

  • Proven Track Record: With a long-standing presence in Merrimack, NH, GSMS has earned the trust of countless homeowners. Our dedication to excellence and reliability has made us a preferred choice for HVAC and plumbing services in the community. We are proud of our reputation and continually strive to uphold the high standards that have set us apart.
  • Local Expertise and Dedication: GSMS has been serving the Merrimack, NH community for over three decades, building a reputation for excellence and reliability. As a family-owned business, we are deeply committed to our local community and understand the unique needs of Merrimack homeowners. Our local expertise allows us to provide tailored solutions that keep your home comfortable and efficient year-round.
  • Comprehensive Range of Services: From HVAC to plumbing, GSMS offers a full spectrum of services to meet all your home comfort needs. Our skilled technicians are trained in the latest technologies and techniques, ensuring top-quality service for every job. Whether you need a quick repair, a new installation, or regular maintenance, we have the expertise to get the job done right.

Become a GSMS Home Club member today

Join the GSMS Home Club and enjoy exclusive benefits designed to keep your home’s HVAC and plumbing systems in top condition. Membership perks include:

  • Priority Service
  • No Diagnostic Fees
  • 10% Off Repairs
  • Home ID and Smart Monitoring
  • Monthly Credits Towards Major Purchases
  • Regular Maintenance
  • Labor Warranty Upgrades

Call today for great service in Merrimack.

Trust the experts at GSMS to provide reliable, efficient, and top-quality services tailored to your needs. Whether you need a quick repair, a new installation, or regular maintenance, our dedicated team is here to ensure your Merrimack home remains comfortable and functional year-round.

Call 603-424-8258 today or fill out our online contact form to book an appointment!

Recent Jobs and Reviews in Merrimack, NH

Rated 5.0 out of 5 stars based on 8 customer reviews

Customers say: The reviews exhibit a positive overall sentiment, with a slight inclination towards the positive. The majority of the reviews express satisfaction with the services provided by GSMS, highlighting their professionalism, courtesy, and expertise. Customers appreciate the timely arrival, thorough explanations, and effective problem-solving. Positive mentions of the company's reliability, trustworthiness, and quality of service are also evident. Additionally, customers express gratitude for the helpfulness, knowledge, and timeliness of the staff, as well as the overall positive experience. However, there are a few negative reviews, primarily focused on issues with heating and cooling systems. However, the negative reviews are outweighed by the positive ones, indicating that the positive experiences of customers significantly outweigh the negative ones.

Our Local Reviews by City

Job Locations and Reviews

Jack D.
Jack D. Checked in
Replace flow restrictor, install new humidifer housing with new humidifer pad, replace coroded saddle valve with a real angle valve. During the plumbing visit we found a waste line hanger that cane undone in the basement. We also reccomend adding a check valve to the p trap drain for your RO system. We found a failed expansion tank and replaced it.
Merrimack, NH 03054
Mark D.
Mark D. Checked in
Aqua sure water system
Merrimack, NH 03054
Review
Excellent service
Ronald - Merrimack, NH 03054
Adam P.
Adam P. Checked in
Furnace was turning on burners but not blower. No power out of blower control. Needs new board. Have temporary wired blower with a plug to run blower. We came back today and replaced the board. Everything went great. Thank you!
Merrimack, NH 03054
Mark D.
Mark D. Checked in
Plumbing pm
Merrimack, NH 03054
Review
Mark as always did a great job
Thomas - Merrimack, NH 03054
Response from GSMS Air•Heating•Plumbing:

We are so grateful for your kind words.

Mark D.
Mark D. Checked in
Check hot water heater and plumbing
Merrimack, NH 03054
Qwentin G.
Qwentin G. Checked in
I started off with replacing the 20x25x5 Air Bear filter. Next, I inspected the burners for corrosion and rust and they looked really good. I pulled out the flame sensor and I cleaned it. I then checked the blower motor capacitor and it was in spec. I checked all of the electrical connections and everything looked good. I flushed the condensate pump with cleaner. On the gas portion of the maintenance I checked the incoming gas pressure and it was within manufactures specs. Next, I checked the gas pressure going to the burners it was inspect as well. After that, I tightened, the bolts and leaked checked with an electronic leak detector. I measured the difference between the supply and return air temp and was getting 41°. The manufacture recommends 35 to 65°, so the temp split was perfect. Lastly, I performed a combustion test. The oxygen, CO and CO2 levels were good.
Merrimack, NH 03054
Mark D.
Mark D. Checked in
Install Moen Flo valve and home club inspection ,custom repair to install gfi outlet and wire
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Replace heat exchanger and inducer motor. Parts covered under warranty. Labor is not.
Merrimack, NH 03054
Review
Very professional and courteous. Arrived at the time when he said he would and took the time to what might be causing my leaking issue
Sheryl - Merrimack, NH 03054
Response from GSMS Air•Heating•Plumbing:

Thank you for the wonderful review and for taking the time to share your feedback.

Mark D.
Mark D. Checked in
Checked dishwasher for leaks could be pump.recommend call appliance company.No charge
Merrimack, NH 03054
Jack D.
Jack D. Checked in
I found a sooted heat exchanger caused by a failed inducer motor. Parts are under warranty. I will locate them tomorrow and call you.
Merrimack, NH 03054
Review
a pleasure to work with
Peter - Merrimack, NH 03054
Response from GSMS Air•Heating•Plumbing:

We thank you for sharing your positive experience. It made our day.

Mark D.
Mark D. Checked in
Pm on boiler cleaned igniter and flame sensor,condensate trap and neutralizer
Merrimack, NH 03054
Review
Mark and the team always do a great job solving our issues in a timely manner!
Lorna - Merrimack, NH 03054
Response from GSMS Air•Heating•Plumbing:

Thank you so much for taking the time to leave us this amazing review!

Mark D.
Mark D. Checked in
3/4 hp blower motor and cap
Merrimack, NH 03054
Jack D.
Jack D. Checked in
I removed and cleaned the air eliminator seal. It is good now. All of the air is out of the system. Thank you!
Merrimack, NH 03054
Mark D.
Mark D. Checked in
Check furnace found bad blower motor,replaced gasket on right basket strainer
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Diagnosed issue to be coil in fan relay. It was intermittent. I replaced fuse and cycled system. It did not blow again. I ordered a board just in case it goes again, which is likely. Thank you!
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Drain clpg was fixed when we got here. We walked around to figure out layout and cause. We believe the branch had a plug in it so we ran water and used drain cleaner.
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Everything went great with the maintenance on your York Diamond furnace. We replaced the air filter and the humidifier pad. Gina will call you to schedule an estimate.
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Replace zone board, air filter, fix steam humidifier drain, and replace batteries in downstairs thermostat.
Merrimack, NH 03054
Mark D.
Mark D. Checked in
Heat pm
Merrimack, NH 03054
Mark D.
Mark D. Checked in
Replaced flow switch under warranty
Merrimack, NH 03054
Mark D.
Mark D. Checked in
Relight pilot
Merrimack, NH 03054
Review
Being new to our house, it was nice to get a rundown on how all of the heating systems work. It didn’t hurt that our technician grew up in this house! Both of the guys were really nice and they seemed to do a very thorough job. They answered all our questions.
Becky - Merrimack, NH 03054
Response from GSMS Air•Heating•Plumbing:

We count ourselves lucky for customers like you and look forward to working with you again in the future!

Jack D.
Jack D. Checked in
The boiler maintenance went well. We would recommend replacing the relief valve. The downstairs air handler for heat was serviced. The steam humidifier was serviced. The furnace in the garage was serviced. There are no repairs necessary other than the zone board that needs to be replaced with the downstairs heat only air handler.
Merrimack, NH 03054
Review
Great job as always
Tom - Merrimack, NH 03054
Jack D.
Jack D. Checked in
The GSMS Homeclub furnace maintenance on your Lennox Signature Series went great. I replaced the humidifier pad. Everything is all set and ready for another winter of heating!
Merrimack, NH 03054
Jack D.
Jack D. Checked in
The maintenance on your Lennox natural gas furnace was completed today. Everything looked fine in the furnace. I only had to adjust the manifold, gas pressure. Your furnace is ready for another winter of heating. Thank you!
Merrimack, NH 03054
Jack D.
Jack D. Checked in
Replaced 40-gallon electric water heater. Installed to code including mixing valve. Tested operation. Thank you!
Merrimack, NH 03054
Review
Excellent , professional service
Ellen - Merrimack, NH 03054
Review
As usual, Adam's work is stellar.
Bob Bedrosian - Merrimack, NH 03054
Response from GSMS Air•Heating•Plumbing:

We are so glad to hear that you had a good experience.

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