Your Trusted Heating, AC & Plumbing Experts in Hollis, NH
Since 1987, GSMS has been proud to offer top-notch HVAC services to residents of Hollis, NH. With over three decades of experience, our family-owned business has built a reputation for excellence, reliability, and outstanding customer service. We provide a comprehensive range of HVAC services, including air conditioning repair, replacement, and maintenance, as well as heating services for furnaces and boilers. Our expert technicians are also skilled in installing and maintaining ductless mini-split systems, ensuring that your home stays comfortable year-round. At GSMS, we use only the highest quality products from leading manufacturers, guaranteeing efficient and long-lasting solutions for your HVAC 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 HVAC service in Hollis, NH, and experience the difference of working with trusted local professionals.
In addition to our heating and air conditioning services, we offer top-quality plumbing services to the residents of Hollis, NH. With over three decades of experience, our family-owned business has established a reputation for trust, reliability, and exceptional customer care. Our comprehensive 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. At GSMS, we use only the highest quality materials and the latest techniques to provide efficient and long-lasting solutions for your plumbing needs. Whether you require a quick repair, a complete installation, or regular maintenance, our team is committed to delivering personalized service tailored to your home’s unique requirements. Don’t let plumbing issues disrupt your daily routine—call GSMS today at 603-424-8258 to schedule your plumbing service in Hollis, NH, and experience the peace of mind that comes with working with trusted local professionals.
Recent Jobs and Reviews in Hollis, NH
Our Local Reviews by City
- Amherst, NH (3)
- Atkinson, NH (1)
- Auburn, NH (1)
- Barrington, NH (4)
- Bedford, NH (10)
- Candia, NH (1)
- Chester, NH (1)
- Concord, NH (4)
- Epping, NH (1)
- Goffstown, NH (2)
- Henniker, NH (1)
- Hillsborough, NH (1)
- Hollis, NH (6)
- Hooksett, NH (5)
- Hudson, NH (4)
- Lee, NH (1)
- Londonderry, NH (2)
- Manchester, NH (20)
- Merrimack, NH (4)
- Milford, NH (2)
- Moultonborough, NH (1)
- Nashua, NH (10)
- New Boston, NH (1)
- Northwood, NH (1)
- Pembroke, NH (1)
- Raymond, NH (1)
- Rochester, NH (2)
- Sandown, NH (1)
- Stratham, NH (1)
- Weare, NH (3)
- Windham, NH (2)
Job Locations and Reviews
We always get excellent, professional, prompt service from all the GSMS staff!
Replacement of existing failed gas furnace and old A/C unit with a new Lennox high-efficiency hybrid system featuring a Lennox gas furnace and a Lennox heat pump system.
Both furnace maintained today. I found the basement system to have a failed heat exchanger. I shut it off and we will send a quote over for system replacement. Thank you.
Jack replaced the furnace humidifier that was no longer working causing the air in the house to be very dry.
Mark (and Gina) are THE BEST!!! Super service and so caring. I will use no other!
Gave estimate to install valves on garage sink
Install new AprilAire 720 fan assisted humidifier with new humidistat. Thank you!
Replace with Honeywell valve
We’ve used GSMS for years for all our HVAC needs. They are the best!
No power to his Lennox g51mp furnace. Found loose connection,that melted wire nut. Rewired with a new outlet and gfci outlet. Tested amp draw at 7.5amps. Nameplate 8.2
Glued shower drain pipe
The maintenance on your Weil-McLain Gold series oil fired boiler went great. The relief valve needs to be replaced due to a small dribble. The expansion tank is still good! I noticed that the humidifier on the central air portion of your system does not work. I recommend replacing it due to the current humidifiers’s age and condition. I attached an estimate to replace that with the same model. I also attached an estimate to replace the master bedroom shower valve. Thank you!
I performed a furnace inspection on a Lennox Elite Series gas furnace in Hollis, NH. During the inspection, I checked the burners, flame sensor, and heat exchanger, all of which were in good condition. However, I found a slight crack in the igniter and replaced it with a new OEM part to prevent future ignition issues. I also tested the thermostat, gas pressure, and airflow. The system is now operating efficiently, and the homeowner was advised on proper maintenance to ensure continued performance through the winter season.
I replaced a failed Viessmann boiler with a new, similar model in a residential home in Hollis, NH. Viessmann contributed towards the cost of the new boiler and a portion of the labor for the replacement. After removing the old unit, I installed the new boiler, connected it to the existing gas and water lines, and tested the system. The new Viessmann boiler is functioning efficiently, providing reliable heating. The homeowner was advised on proper maintenance to ensure longevity and optimal performance of the new system.
Pm on boiler and install new tub drain
This is the second time we’ve used GSMS for a major renovation. I can’t say enough good things about the caliber of service. They are so easy to work with, timely and professional.
We’re delighted to hear about your recent experience with us and we’re so pleased that you recommend our services. Thank you for taking the time to share your experience and we look forward to welcoming you back soon!
Replace toilet flange and repipe waterline,redo tub drain for new shower and water pipe shower valve for rain head and hand held shower,repipe old vanity for new double vanity and install fixtures when floor is done
Remove tank and install new liberty ascent tank
Performed maintenance in Hollis on a Navien NCB-240E combination boiler and tankless water heater. Descaled the unit using a vinegar solution to remove mineral buildup in the heat exchanger. Checked the inlet water filter and cleaned it to ensure proper flow. Inspected the ignition system and burner for wear, confirming all components were in good condition. After reassembly, tested the unit to ensure efficient and reliable operation.
In Hollis yesterday afternoon, I repaired an older Bradford White MI5036FBN 50-gallon gas water heater that was struggling to maintain temperature. Inspected the Honeywell thermostat and heating elements, identifying a failing lower element. Drained the tank, replaced the element with a new one, and refilled the system. Checked the pressure relief valve for proper operation and tested the heater to ensure consistent water temperature. The system is now back to full functionality.
EXCELLENT
Thanks for sharing your rating with us and the community.
When I got there, the only thing that was running was the indoor unit and outdoor fan. I then found that two out of the three wires going to the compressor read overload. I then removed the fan and found that one of the connectors on the compressor was burned really good. I cut back all three wires and put new butt connectors on each one. I then rewired the unit and put it all back together. The compressor is now running and the system pressures look fine. I talked to John and told him the system is 30 years old.
