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Hollis, NH

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

Rated 5.0 out of 5 stars based on 15 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.

Job Locations and Reviews

Review
Qwentin is professional, friendly, and efficient! Excellent service.
Ginger - Hollis, NH 03049
Hollis, NH - Completed the Rinnai tankless water heater maintenance today. I started off with running a cleaner through it for 35 minutes. After that I flush 10 gallons of water through it. I cleaned the water inlet screen. I vacuumed out the inside of the unit and the air filter. I checked incoming gas pressure and that was according to manufacturer specifications. I labeled a few emergency shut-off valves. I also completed the plumbing inspection today. I checked all the fixtures and drains and everything looked great. The only thing that I noticed was one of the heads on the water soft tank has been leaking water so I notified and showed the client.
Qwentin G.
Qwentin G. Checked in
Completed the Rinnai tankless water heater maintenance today. I started off with running a cleaner through it for 35 minutes. After that I flush 10 gallons of water through it. I cleaned the water inlet screen. I vacuumed out the inside of the unit and the air filter. I checked incoming gas pressure and that was according to manufacturer specifications. I labeled a few emergency shut-off valves. I also completed the plumbing inspection today. I checked all the fixtures and drains and everything looked great. The only thing that I noticed was one of the heads on the water soft tank has been leaking water so I notified and showed the client.
Hollis, NH 03049
Qwentin G.
Qwentin G. Checked in
Completed the plumbing visit today. I checked the fixtures and drains in the house and everything looked good. I labeled some emergency shut off's in the basement. I did not flush the water tank due to the age and no record of it being flushed. The tank is 9 years old and we don't like to flush tanks if they're over 6 years old and haven't had the maintenance done on them before. The tank looked to be in nice condition though. The boiler relief valve has been leaking so I will send over an estimate to replace the relief valve and add glycol back into the system. Will also send over an estimate for the toilet flapper.
Hollis, NH 03049
Review
Great work as always
Mark - Hollis, NH 03049
Adjust fujitsu ducted system settings for more comfortable and even heating. Diagnosed bad wall thermostat for electric radiant. We will send an estimate to have our electrician replace it. I replaced the toilet flapper as well.
Adjust fujitsu ducted system settings for more comfortable and even heating. Diagnosed bad wall thermostat for electric radiant. We will send an estimate to have our electrician replace it. I replaced the toilet flapper as well.
Jack D.
Jack D. Checked in
Adjust fujitsu ducted system settings for more comfortable and even heating. Diagnosed bad wall thermostat for electric radiant. We will send an estimate to have our electrician replace it. I replaced the toilet flapper as well.
Hollis, NH 03049
Hollis, NH - Completed the Rinnai tankless water heater maintenance today. I started off with flushing cleaner through it for 40 minutes. After that I flushed 10 gallons of water through it. I cleaned the water inlet screen. I vacuumed out the inside of the unit. I checked incoming gas pressure and that was according to manufacturer specifications. I also completed the house plumbing inspection. I checked all the fixtures and drains and everything looked great.
Qwentin G.
Qwentin G. Checked in
Completed the Rinnai tankless water heater maintenance today. I started off with flushing cleaner through it for 40 minutes. After that I flushed 10 gallons of water through it. I cleaned the water inlet screen. I vacuumed out the inside of the unit. I checked incoming gas pressure and that was according to manufacturer specifications. I also completed the house plumbing inspection. I checked all the fixtures and drains and everything looked great.
Hollis, NH 03049
Jack D.
Jack D. Checked in
Repaired leaking gas fitting. I checked every other fitting with leak detector and they were all set. I checked your propane tanks and they are almost empty.
Hollis, NH 03049
Review
Qwentin performed annual maintenance on our furnace. He kept us informed on how the process was going and closed up the basement when the work was completed. A very professional job!
Lori B - Hollis, NH 03049
Hollis, NH - Completed the oil boiler maintenance today. I changed the oil filter, the pump strainer, the nozzle and the electrodes. Pulled the cover off of the heat exchanger and I brushed and vacuumed out the heat changer. I ran the boiler and I completed a combustion analyzer test and everything looked great. On the furnace in the basement I replaced the humidifier pad that the client supplied and turned the humidifier on.
Qwentin G.
Qwentin G. Checked in
Completed the oil boiler maintenance today. I changed the oil filter, the pump strainer, the nozzle and the electrodes. Pulled the cover off of the heat exchanger and I brushed and vacuumed out the heat changer. I ran the boiler and I completed a combustion analyzer test and everything looked great. On the furnace in the basement I replaced the humidifier pad that the client supplied and turned the humidifier on.
Hollis, NH 03049
Review
Always great service with GSMS
Ginger - Hollis, NH 03049
Jack D.
Jack D. Checked in
Annual GSMS HomeClub heating maintenance. Everything went great. I replaced the flame sensor which was covered under both Lennox part warranty and GSMS Labor warranty. Thank you!
Hollis, NH 03049
I completed both furnace maintenances today. I started off at the unit in the basement and I replaced the air filter with a 20 x 25 x 5 air bear filter. I pulled the flame sensor and I cleaned it. I flushed the trap and condensate pump with cleaner. I checked all the wiring connections and the capacitor and everything looked good. The burner tubes, burner box and heat exchanger are getting pretty rusty. I checked incoming and outgoing gas pressures. Everything was within manufacture specifications. Lastly I ran the unit and I performed a combustion analyzer test to check for CO, CO2 and oxygen levels and everything looked good. Next I completed the maintenance on the furnace in the attic. I pulled the air filter and it looked almost brand new so I didn’t replace it. I checked all the wiring connections and the capacitor, everything looked good as well. I pulled and cleaned the flame sensor. I checked incoming and outgoing gas pressures. Those were according to manufacturer specificatio
I completed both furnace maintenances today. I started off at the unit in the basement and I replaced the air filter with a 20 x 25 x 5 air bear filter. I pulled the flame sensor and I cleaned it. I flushed the trap and condensate pump with cleaner. I checked all the wiring connections and the capacitor and everything looked good. The burner tubes, burner box and heat exchanger are getting pretty rusty. I checked incoming and outgoing gas pressures. Everything was within manufacture specifications. Lastly I ran the unit and I performed a combustion analyzer test to check for CO, CO2 and oxygen levels and everything looked good. Next I completed the maintenance on the furnace in the attic. I pulled the air filter and it looked almost brand new so I didn’t replace it. I checked all the wiring connections and the capacitor, everything looked good as well. I pulled and cleaned the flame sensor. I checked incoming and outgoing gas pressures. Those were according to manufacturer specificatio
Qwentin G.
Qwentin G. Checked in
I completed both furnace maintenances today. I started off at the unit in the basement and I replaced the air filter with a 20 x 25 x 5 air bear filter. I pulled the flame sensor and I cleaned it. I flushed the trap and condensate pump with cleaner. I checked all the wiring connections and the capacitor and everything looked good. The burner tubes, burner box and heat exchanger are getting pretty rusty. I checked incoming and outgoing gas pressures. Everything was within manufacture specifications. Lastly I ran the unit and I performed a combustion analyzer test to check for CO, CO2 and oxygen levels and everything looked good. Next I completed the maintenance on the furnace in the attic. I pulled the air filter and it looked almost brand new so I didn’t replace it. I checked all the wiring connections and the capacitor, everything looked good as well. I pulled and cleaned the flame sensor. I checked incoming and outgoing gas pressures. Those were according to manufacturer specificatio
Hollis, NH 03049
Mark D.
Mark D. Checked in
Tune up boiler and replace water filter
Hollis, NH 03049
Jack D.
Jack D. Checked in
Snake drain. Run cleaner. Drain and vacuum overflow pan. Test drain. You're all set thank you!
Hollis, NH 03049
Review
Always First Rate
John - Hollis, NH 03049
Jack D.
Jack D. Checked in
GSMS hoke club maintenances. Thank you!
Hollis, NH 03049
Review
Jack spent time taking measurements, cleaning and testing the various components of our A/C system. He gave us a checklist of what he did at the end of the service time.
Lori - Hollis, NH 03049
Jack D.
Jack D. Checked in
You AC maintenance on both systems was completed today. The only issue is found was a dirty evaporator coil and dirty blower wheel down stairs that is causing bad airflow through the air handler.
Hollis, NH 03049
Review
Quentin was very efficient, carefully cleaning of each unit. Left no mess at all! Job well done!
JoAnn - Hollis, NH 03049
Qwentin G.
Qwentin G. Checked in
I start off with cleaning the outdoor units coil with water. I washed the outside of the unit as well. I checked all the electrical connections and everything looked great. Next, I washed all the air filters with Dawn soap and water. I cleaned all the indoor heads coils with soap and water as well. Lastly I ran the units in heating mode and everything looked and ran great!
Hollis, NH 03049
Review
GSMS always provides excellent service! Highly recommended!!
Ginger - Hollis, NH 03049
Response from GSMS Air•Heating•Plumbing:

Thank you so much for this 5-star review. We really appreciate you being a customer and helping to share the word about us. We’re here for you anytime.

Jack D.
Jack D. Checked in
I started off with cleaning both of the outdoor units coils with water and coil cleaner. I checked the electrical connections and the capacitor in both of the units and they were inspect. Next, I went to the basement unit and I replaced the air filter with a 20 x 25 x 5 air bear filter. The capacitor for the blower motor was inspect. I flushed the drain in the condensate pump with cleaner. I went upstairs and I replaced the air filter with a 20 x 25 x 5 air bear filter as well. I checked the electrical connections and they all looked good. I cleaned and flush the trap with cleaner. I ran both of the units, tested the pressures and they both ran good. When I was in the basement I smelled propane so I went around with my electronic analyzer and discovered three leaks. One leak was coming from the union at the Reni water heater. The other two leaks were on the main gas line coming in at a coupling and a tee. I let the client know and we went ahead with fixing the three leaks.
Hollis, NH 03049
Jack D.
Jack D. Checked in
Replace the leaking coil on the indoor unit. The coil itself is covered under warranty but the labor and other materials. Job Description: Remove all existing refrigerant from system. Disconnect and disassemble the indoor unit. Remove the old coil from the indoor unit. Install the new coil. Reinstall the unit to the wall, reconnect the refrigerant piping, and electrical connections. Pressure test the system. Pull vacuum on system and refill with proper amount of refrigerant.
Hollis, NH 03049
Qwentin G.
Qwentin G. Checked in
Found that the unit was low on refrigerant. We came last July and put dye and recharged the unit. The part is under warranty still. The client wanted to go ahead and replace the indoor coil. I added refrigerant to get him by until we get it fixed.
Hollis, NH 03049
Jack D.
Jack D. Checked in
Adjust settings on Nest.
Hollis, NH 03049
Jack D.
Jack D. Checked in
We will send estimates for the two shower valve replacements. Thank you!
Hollis, NH 03049
Jack D.
Jack D. Checked in
Everything went great with your maintenance. I adjusted the master bathroom shower to 120 deg F. It was previously 113. Thank you.
Hollis, NH 03049
Review
We have used Mark and GSMS for every needed repair/refit for 6 years. They just finished our final bathroom renovation and it is perfect. GSMS is always on time, thorough, and professional. We recommend them every chance we get.
Cindy - Hollis, NH 03049
Mark D.
Mark D. Checked in
Installed vanity and toilet,when glass door is done I will trim and set water temp in shower.job complete
Hollis, NH 03049
Review
We always get excellent, professional, prompt service from all the GSMS staff!
Ginger - Hollis, NH 03049
Response from GSMS Air•Heating•Plumbing:

Thank you so much for taking the time to leave an excellent rating. We really appreciate your business.

Adam P.
Adam P. Checked in
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.
Hollis, NH 03049
Jack D.
Jack D. Checked in
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.
Hollis, NH 03049
Review
Jack replaced the furnace humidifier that was no longer working causing the air in the house to be very dry.
Lori - Hollis, NH 03049
Review
Mark (and Gina) are THE BEST!!! Super service and so caring. I will use no other!
JoAnn - Hollis, NH 03049
Mark D.
Mark D. Checked in
Gave estimate to install valves on garage sink
Hollis, NH 03049
Jack D.
Jack D. Checked in
Install new AprilAire 720 fan assisted humidifier with new humidistat. Thank you!
Hollis, NH 03049
Mark D.
Mark D. Checked in
Replace with Honeywell valve
Hollis, NH 03049
Review
We’ve used GSMS for years for all our HVAC needs. They are the best!
Ginger - Hollis, NH 03049
Review
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.
Woody - Hollis, NH 03049
Response from GSMS Air•Heating•Plumbing:

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!

Review
EXCELLENT
John - Hollis, NH 03049
Response from GSMS Air•Heating•Plumbing:

Thanks for sharing your rating with us and the community.

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