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Windham, NH

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Your Trusted Heating, AC & Plumbing Experts in Windham, NH

Since 1987, GSMS has been proud to offer top-notch HVAC services to residents of Windham, 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 Windham, 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 Windham, 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 Windham, NH, and experience the peace of mind that comes with working with trusted local professionals.

Recent Jobs and Reviews in Windham, NH

Rated 5.0 out of 5 stars based on 7 customer reviews

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

Job Locations and Reviews

Completed the furnace maintenance for upstairs and basement furnaces. Downstairs I replaced the air filter and the humidifier pad that the client provides. I vacuumed out the inside of the unit as well. I checked all the wiring and everything looked good. I cleaned the flame sensor. I flushed the trap and condensate pump with cleaner. I checked incoming gas pressure and outgoing gas pressure and everything was inspect. Lastly, I checked CO, CO2 and oxygen levels and everything was within manufacture specifications. I didn’t replace the filter because it was very clean. I flushed the trap and condensate pump with cleaner. I cleaned the flame sensor. I checked gas pressures as well and everything looked good. Lastly, I ran the unit and did a combustion test as well and everything was within manufacturer specifications!
Completed the furnace maintenance for upstairs and basement furnaces. Downstairs I replaced the air filter and the humidifier pad that the client provides. I vacuumed out the inside of the unit as well. I checked all the wiring and everything looked good. I cleaned the flame sensor. I flushed the trap and condensate pump with cleaner. I checked incoming gas pressure and outgoing gas pressure and everything was inspect. Lastly, I checked CO, CO2 and oxygen levels and everything was within manufacture specifications. I didn’t replace the filter because it was very clean. I flushed the trap and condensate pump with cleaner. I cleaned the flame sensor. I checked gas pressures as well and everything looked good. Lastly, I ran the unit and did a combustion test as well and everything was within manufacturer specifications!
Qwentin G.
Qwentin G. Checked in
Completed the furnace maintenance for upstairs and basement furnaces. Downstairs I replaced the air filter and the humidifier pad that the client provides. I vacuumed out the inside of the unit as well. I checked all the wiring and everything looked good. I cleaned the flame sensor. I flushed the trap and condensate pump with cleaner. I checked incoming gas pressure and outgoing gas pressure and everything was inspect. Lastly, I checked CO, CO2 and oxygen levels and everything was within manufacture specifications. I didn’t replace the filter because it was very clean. I flushed the trap and condensate pump with cleaner. I cleaned the flame sensor. I checked gas pressures as well and everything looked good. Lastly, I ran the unit and did a combustion test as well and everything was within manufacturer specifications!
Windham, NH 03087
Jack D.
Jack D. Checked in
Replace UV bulb in water filtration system. Thank you!
Windham, NH 03087
Completed the furnace maintenance today. I replaced the 20 x 25 x 5 air bear filter. I also replaced the humidifier pad and turned the humidifier on. I checked all the wiring connections and everything looked good. I flushed the trap and condensate pump with cleaner. I checked incoming gas pressure and outgoing gas pressure and those were in spec. I ran the unit in high and low fire and performed a combustion analyzer test. I checked for CO, CO2 and oxygen levels and everything was with innmanufacture specifications.
Completed the furnace maintenance today. I replaced the 20 x 25 x 5 air bear filter. I also replaced the humidifier pad and turned the humidifier on. I checked all the wiring connections and everything looked good. I flushed the trap and condensate pump with cleaner. I checked incoming gas pressure and outgoing gas pressure and those were in spec. I ran the unit in high and low fire and performed a combustion analyzer test. I checked for CO, CO2 and oxygen levels and everything was with innmanufacture specifications.
Qwentin G.
Qwentin G. Checked in
Completed the furnace maintenance today. I replaced the 20 x 25 x 5 air bear filter. I also replaced the humidifier pad and turned the humidifier on. I checked all the wiring connections and everything looked good. I flushed the trap and condensate pump with cleaner. I checked incoming gas pressure and outgoing gas pressure and those were in spec. I ran the unit in high and low fire and performed a combustion analyzer test. I checked for CO, CO2 and oxygen levels and everything was with innmanufacture specifications.
Windham, NH 03087
Performed a maintenance on this propane furnace in the basement. Client supplies his own air filters. Checked the wiring and everything looks good. Ran unit on low and high fire. Checked the gas pressures and everything was in spec. Performed a combustion analyzing test to measure CO, CO2 and O2 and everything was in manufacture specs.
Performed a maintenance on this propane furnace in the basement. Client supplies his own air filters. Checked the wiring and everything looks good. Ran unit on low and high fire. Checked the gas pressures and everything was in spec. Performed a combustion analyzing test to measure CO, CO2 and O2 and everything was in manufacture specs.
Jack D.
Jack D. Checked in
Performed a maintenance on this propane furnace in the basement. Client supplies his own air filters. Checked the wiring and everything looks good. Ran unit on low and high fire. Checked the gas pressures and everything was in spec. Performed a combustion analyzing test to measure CO, CO2 and O2 and everything was in manufacture specs.
Windham, NH 03087
Review
Thank you for the prompt service!
Lori - Windham, NH 03087
Mark D.
Mark D. Checked in
Check uv lite looks like it's the bulb,went through rinnai with Mike Galivan,he is sending info to engineer,Couldn't find anything with lennox.It has high pressure code on August 12.Need appointment to go back when uv lite comes in
Windham, NH 03087
Jack D.
Jack D. Checked in
Perform deepclean on master bedroom mini split indoor unit.
Windham, NH 03087
Jack D.
Jack D. Checked in
Mini split maintenance today on both systems. Everything went great. The master bedroom indoor unit needs a deep clean performed. The blower wheel is clogged and that is the cause of poor cooling performance. We have sent an estimate to complete that service. Thank you!
Windham, NH 03087
Mark D.
Mark D. Checked in
Finished running drain to pump
Windham, NH 03087
Jack D.
Jack D. Checked in
Replace Lennox condenser fan motor OEM. Motor covered under warranty. Thank you!
Windham, NH 03087
Jack D.
Jack D. Checked in
Everything went great with your GSMS HomeClub AC maintenances performed on both central air systems. New air filters in upstairs and basement system. Thank you!
Windham, NH 03087
Jack D.
Jack D. Checked in
GSMS HomeClub maintenance performed. Everything went great. Please see attached maintenance form for detailed results!
Windham, NH 03087
Jack D.
Jack D. Checked in
Two AC maintenancesheet performed as part of GSMS Homeclub. Two new 20x25x5 filters! Thank you!! Please see attached form for maintenance results.
Windham, NH 03087
Mark D.
Mark D. Checked in
Removed old log set.New log set is 21" old one is 16" with burner.Needs new one 14"
Windham, NH 03087
Mark D.
Mark D. Checked in
Estimate for gasline to grill
Windham, NH 03087
Jack D.
Jack D. Checked in
Half upfront payment will be required for this project. Please see description for scope of work.
Windham, NH 03087
Review
Fast and Efficient
Phil - Windham, NH 03087
Mark D.
Mark D. Checked in
Repaired outside faucet.(Will stop by and replace diverter valve new one has bad handle)
Windham, NH 03087
Review
Mark is careful, knowledgable, efficient, and friendly Thanks!
Andy - Windham, NH 03087
Mark D.
Mark D. Checked in
Replaced toe kick heater
Windham, NH 03087
Review
Thank you for the great service!!
Steven - Windham, NH 03087
Adam P.
Adam P. Checked in
Replaced rinnai water heater
Windham, NH 03087
Jack D.
Jack D. Checked in
I found the lennox smart hub to be failed. I tested all of the comm signals and they were good. I have had this before with a bad hub so I replaced it with a new generation. I tested the system and it is working correctly now. Thank you.
Windham, NH 03087
Jack D.
Jack D. Checked in
Water heater maintenance. Arrived to perform routine maintenance on a Rinnai tankless water heater, ensuring it was running efficiently. I flushed the system to remove any mineral buildup and checked for potential issues, preventing future breakdowns. After testing the unit, I confirmed it was operating at peak performance, providing reliable hot water for the homeowner.
Windham, NH 03087
Mark D.
Mark D. Checked in
Replace kitchen hot water heater
Windham, NH 03087
Review
Fantastic. I couldn’t be more satisfied. I don’t have heat yet but I didn’t expect to. As long as he returns with the required parts in a reasonable length of time, I’ll be happy.
Edmund - Windham, NH 03087
Response from GSMS Air•Heating•Plumbing:

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

Jack D.
Jack D. Checked in
Look at water source heat pump that has a failed heat exchanager. We will email back with price to fix.
Windham, NH 03087
Jack D.
Jack D. Checked in
Meeting with Rinaii rep. We diagnosed the servo valve as being the noise issue. The rep will order a new one under warranty. Thank you.
Windham, NH 03087
Jack D.
Jack D. Checked in
Atmospheric vent seemed to be stuck. Also possible grease buildup in trap. I flushed my drain cleaner and replaced the vent. Everything is draining great. I also found the basket strainer gasket to have a slow leak. I tightened that up! Thank you!
Windham, NH 03087
Jack D.
Jack D. Checked in
I replaced the two check valves and circulator pump on the Rinnai tank less water heater according to the rep. Please let us know if the noise goes away. I also collected another water sample to drop off. Thank you.
Windham, NH 03087
Review
Excellent Service!
Lori - Windham, NH 03087
Review
Regarding the Faucet at my house ... would there be any kind of warranty on that unit - doesn't appear to be too long ago we put it in and now it became defective? Thanks - Phil
Montcalm - Windham, NH 03087
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