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Jack Downing

Jack Downing

Senior Service Specialist

Rating

Reviews

LICENSES: GAS SERVICE

Having grown up in the family business, Jack officially entered the trades and joined the GSMS team seven years ago because it simply felt like the perfect fit. Guided by the Golden Rule, Jack appreciates the genuine kindness of both his colleagues and his clients, and he wants every customer to know that the team will always try to do their absolute best on every job. A natural learner who loves to master new skills, Jack stays incredibly active outside of work. You can usually find him renovating his first house, woodworking, playing the guitar and drums, or experimenting with new recipes on the grill and smoker. Depending on the season, he also loves skiing or cycling. Above all, he cherishes the time he spends with his fiancé, Hope, and their Australian Shepherd, Norman. Jack is also a proud member of the Pointer Fish & Game Club.

Name: Jack Downing

Recent Jobs and Reviews

Rated 5.0 out of 5 stars based on 195 customer reviews

Customers say: The overall sentiment is overwhelmingly positive, with customers expressing high satisfaction and strong loyalty. A recurring theme is professionalism: technicians are consistently described as knowledgeable, courteous, friendly, and personable, and many reviewers appreciate their willingness to patiently answer questions and explain the work being done. Punctuality and efficiency come up often, with customers noting that appointments were kept, issues were diagnosed quickly, and work was completed thoroughly. Many also praise the company's responsiveness and communication, including a helpful office team, a smooth scheduling process, and a willingness to accommodate urgent needs. Fair pricing, quality installations, and careful, tidy work habits add to the favorable impressions. Longtime customers describe consistently excellent experiences, while first-time customers express being pleasantly impressed. Many say they plan to keep using the company for maintenance and future projects and would readily recommend it to others, reflecting a strong sense of trust and appreciation.

At a glance

GSMS Air•Heating•Plumbing has completed 25 jobs in October 2026.

The 15 customer reviews shown here average 5.0 out of 5.

The most recent job was on October 29, 2026.

Recent work covers Manchester, NH, Merrimack, NH, Amherst, NH, Nashua, NH and Barrington, NH.

Job Locations and Reviews

Jack D.
Jack D. Checked in
Oil boiler PM
Dover, NH 03820
Jack D.
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Boiler PM.
Dover, NH 03820
Jack D.
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Oil boiler PM. Replaced cad cell eye.
Manchester, NH 03104
Jack D.
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Clear out sewer main with cleaner. Block didnt look bad when I pulled cleanout. If it backs up please call the referral I left with you.
Hudson, NH 03051
Jack D.
Jack D. Checked in
Pex valve.
Manchester, NH 03102
Jack D.
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Manchester, NH 03102
Jack D.
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Manchester, NH 03102
Jack D.
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Manchester, NH 03102
Chester, NH - Repair section of copper water piping.
Jack D.
Jack D. Checked in
Repair section of copper water piping.
Chester, NH 03036
Maintenance today on Rinnai boiler. Maintenance kit servicing is necessary to be completed.
Maintenance today on Rinnai boiler. Maintenance kit servicing is necessary to be completed.
Jack D.
Jack D. Checked in
Maintenance today on Rinnai boiler. Maintenance kit servicing is necessary to be completed.
Bedford, NH 03110
Furnace PM
Furnace PM
Jack D.
Jack D. Checked in
Furnace PM
Bedford, NH 03110
Review
GSMS was quick to respond to my heater issue and scheduled a technician, Jack. He was very knowledgeable and thorough in diagnosing the problem and explained what he did to resolve it.
Michael - Amherst, NH 03031
Jack D.
Jack D. Checked in
Bad condensate pump. Replace with new pump.
Merrimack, NH 03054
Jack D.
Jack D. Checked in
New nozzle had issue. I replaced with new. Systrm has poor draft. Reccomend uprising flue to 6".
Amherst, NH 03031
Review
Friendly and knowledgeable, gets the job done right.
Matt - Barrington, NH 03825
Boiler PM. See maintenance form. Install humidistat for ducted dehumidifier. Do not charge for labor only materials.
Boiler PM. See maintenance form. Install humidistat for ducted dehumidifier. Do not charge for labor only materials.
Jack D.
Jack D. Checked in
Boiler PM. See maintenance form. Install humidistat for ducted dehumidifier. Do not charge for labor only materials.
Barrington, NH 03825
Maintenance on rooftop unit & fox thermostat wiring that was incorrect.
Maintenance on rooftop unit & fox thermostat wiring that was incorrect.
Jack D.
Jack D. Checked in
Maintenance on rooftop unit & fox thermostat wiring that was incorrect.
Manchester, NH 03104
Review
Good service and very efficient. Easy to address issues and coordinate appointments.
Nelson - Merrimack, NH 03054
Manchester, NH - I found a bad inducer motor with open windings. We will send an estimate to replace.
Jack D.
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I found a bad inducer motor with open windings. We will send an estimate to replace.
Manchester, NH 03109
Jack D.
Jack D. Checked in
Replace control board on Rinnai boiler. I found that the 4000 hour service is due. I also noticed a leaking water sensor.
Windham, NH 03087
Onstall Lennox S40 thermostat. Perform furnace maintenance. I reccomend installing gas low pressure switch and replacing the inducer vent coupling.
Onstall Lennox S40 thermostat. Perform furnace maintenance. I reccomend installing gas low pressure switch and replacing the inducer vent coupling.
Jack D.
Jack D. Checked in
Onstall Lennox S40 thermostat. Perform furnace maintenance. I reccomend installing gas low pressure switch and replacing the inducer vent coupling.
Amherst, NH 03031
New Boston, NH - Pull and reset toilet. Add strong washers for handicap toilet purposes. Replace supply line that was leaking.
Jack D.
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Pull and reset toilet. Add strong washers for handicap toilet purposes. Replace supply line that was leaking.
New Boston, NH 03070
Jack D.
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No Heat. Three way valve in boiler failed. I was able to temporarily repair it for now. We will order warranty replacement.
Merrimack, NH 03054
Furnace maintenance. Please see maintenance form for details. Thank you!
Furnace maintenance. Please see maintenance form for details. Thank you!
Jack D.
Jack D. Checked in
Furnace maintenance. Please see maintenance form for details. Thank you!
New Boston, NH 03070
Tilton, NH - Loose molex connector on comm wire from display to control board. Caused system to lockout. Ran combustion test. System is operating as intended.
Jack D.
Jack D. Checked in
Loose molex connector on comm wire from display to control board. Caused system to lockout. Ran combustion test. System is operating as intended.
Tilton, NH 03276
Maintenance on York gas furnace. Please see the Maintenance form for details of today's service. Thank you!
Maintenance on York gas furnace. Please see the Maintenance form for details of today's service. Thank you!
Jack D.
Jack D. Checked in
Maintenance on York gas furnace. Please see the Maintenance form for details of today's service. Thank you!
Nashua, NH 03060
Jack D.
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Furnace maintenance, replace air filter.
Merrimack, NH 03054
Gsms Homeclub furnace maintenance. I repaired a gas leak. We will provide an estimate to install a low pressure switch.
Gsms Homeclub furnace maintenance. I repaired a gas leak. We will provide an estimate to install a low pressure switch.
Jack D.
Jack D. Checked in
Gsms Homeclub furnace maintenance. I repaired a gas leak. We will provide an estimate to install a low pressure switch.
Brentwood, NH 03833
Review
Jack came right on time and figured out my heating problem right away. He got me a new thermostat, installed it and the price was very fair for his time and the new thermostat.
BJ - Merrimack, NH 03054
Review
Showed up when scheduled and did a thorough inspection with diagnosis of two components in our furnace which would cause trouble down the road.
Ted - Amherst, NH 03031
Review
Jack was knowledgeable and personable
Janeen - Londonderry, NH 03053
Review
Excellent and professional service
Shawn - Gilmanton, NH 03237
Review
Excellent service
Gary - Stratham, NH 03885
Review
Jack was very professional, courteous, personable and thorough. Definitely at the top of my list for any future work needed and routine maintenance.
Bob - Manchester, NH 03104
Review
Jack did a great job checking our mini split and explaining how it should operate. He took the time to answer all our questions.
Joe - Nashua, NH 03060
Review
Jack was thorough and answered all questions. He’ll be our requested service tech from now on
Len - Newmarket, NH 03857
Review
It is always great to see Jack! GSMS never disappoints.
Karen - Nashua, NH 03063
Review
very courteous, efficient. a pleasure to work with.
Peter - Merrimack, NH 03054
Review
Excellent as usual
John - Hollis, NH 03049
Review
Great service, right on time. Jack did a great job picking out my new faucets.
Lisa - Merrimack, NH 03054
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