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Approved Pro
Approved Pro

GSM Services

Heating and Air Conditioning Service, Insulation, Energy Efficiency Auditing,

About us

We are a licensed and insured HVAC and home services contractor, delivering fast, affordable, and top-quality work backed by a 100% satisfaction guarantee. With over 98 years in business, we’ve earned a reputation for exceptional customer service, reliability, and trust. As your one-stop solution for home comfort, we specialize in improving comfort, energy efficiency, air quality, and the overall health of your home’s environment. Heating & Cooling Repairs • HVAC Install & Replacements • Insulation • Air Duct Cleaning • Dryer Vent Cleaning • Home Energy Audits • Crawl Space Encapsulations • Attic & Crawl Space Improvement Services • Standby Generators • Air Quality & Home Mold Solutions • Dehumidifiers • Ductwork Repair & Replacement • FREE HVAC Service Calls with Repair • FREE Online Quote on New Heating & Cooling Systems • FREE Insulation Evaluations • FREE Crawl Space Evaluations • FREE Home Energy Audits

Business highlights

Eco Friendly
Family owned & operated
Emergency services offered
98 years of experience

Services we offer

Air Conditioning Installation & Repairs • Furnace Installation & Repairs • HVAC Replacement • Insulation Services • Air Duct Cleaning • Dryer Vent Cleaning • FREE Home Energy Audits • Crawl Space Encapsulations • Crawl Space Repair • Home Generator Installations • Air Quality Solutions • Humidifiers • Dehumidifiers • Duct Replacement • Duct Repair

Services we don't offer

appliance repairs (refrigerators, dish washers, washer/dryers, etc.)

Amenities

Eco Friendly Accreditations

Yes

Emergency Services

Yes

Free Estimates

Yes

Warranties

Yes

Accepted Payment Methods

  • PayPal
  • Financing Available
  • Check
  • Zelle
  • Venmo
  • CreditCard
Reviews
4.989 Reviews
Number of StarsImage of DistributionNumber of Ratings
5
91%
4
6%
3
1%
2
2%
1
0%

Filter reviews by service

Showing 1-25 of 89 reviews
Amanda R.
Apr 2023
5.0
Insulation
Yes, I recommend this pro
$12,000
Everything was seamless! Great job
Response from GSM Services
"Thank you so much [Member Name Removed] for the great review! If you need anything at all we are here for you! Please do not hesitate to reach out!"

Oscar H.
Jan 2022
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
The technicians were awesome!
Response from GSM Services
"Thank you so much for taking the time to leave this review!! We will let their leaders know so they can be recognized!"

KARL H.
Dec 2020
5.0
Insulation
Yes, I recommend this pro
Very honest and knowledgeable
Response from GSM Services
"Thank you so much!! Please let us know if you ever need anything!"

John S.
Aug 2020
2.0
Insulation, Air Duct Cleaning
I called and asked about having an estimate done for spray foam insulation. They said they don't offer that because it "isn't energy efficient". I find that extremely hard to believe.
Response from GSM Services
"Thanks so much for your inquiry. You are correct, spray foam is very energy efficient. There are applications where we question how cost effective it is but there is no question that it is an extremely energy efficient product when applied properly. We apologize for any confusion with our response. We also are just not set up to perform large volume spray foaming projects but we do offer some solutions that might be comparable."

Trudy M.
Nov 2019
5.0
Heating and Air Conditioning Service, Basement Waterproofing
Yes, I recommend this pro
$19,500
GSM did an excellent job on my crawl space. They kept in touch with me so I knew what was being done. The work was done neatly.

Sean M.
Oct 2019
5.0
Insulation, Energy Efficiency Auditing
Yes, I recommend this pro
Quick response, great price, excellent work and great communication. I will be working with this business again on more of my houses.

Bill S.
Dec 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
The whole process went very well

Steve W.
Dec 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
$167
Smoothly. Technician is knowledgable and professional; inspection procedure is thorough.

George S.
May 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
$1,500
Very well done, prompt and effective.

Ralph P.
May 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
excellent work

Scott L.
May 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
$10,933
I hired GSM Services to replace my A/C unit and furnace with a newer, upgraded system. A few weeks ago Kelly came to my house to give me an estimate for a new heating and air system. He was on time and very professional. He surveyed my existing system, took measurements of my house, and did some calculations to determine exactly what type and capacity system that I would need. He showed and explained to me several options as well as their prices. He wasn’t pushy as he left in order to give me time to review the different options before making my decision. I called the office the next day with my decision and to set up a date and time for installation. Today (May 22) Kyle and Craig showed up on time and were extremely professional as well. They worked from 8:30 to 5:30 completing the replacement of my entire heating/air system. The field team leader also showed up just to ensure that everything was going smoothly. They were very helpful in answering any questions that I had throughput the day and they took the time to explain to me about the new system after installation was complete (I.e. how to operate the new programmable thermostat). Overall, it was a great experience and I will definitely use them again.

Brian S.
May 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
$8,250
Excellent all away around

JoAnn T.
May 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
Excellent work done by Scott. Everything explained. Cleaned debris out of units. Wore booties while in our home. Changed filters and showed me a long list of all the other maintenance he did on the units. Have used this company for over 25 years.

Lamarr H.
Apr 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
This was my spring check up on air conditioner before running.. Everything went very well. Everyone should have a service contract with GSM they are the best. I have tried others but they do not compare to GSM.
Response from GSM Services
"Thank you so much for your review! We are very thankful to have you as a customer!"

Dave C.
Feb 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
$1,200
Diagnosis and fix were accurate

Dan B.
Feb 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
This service was very good. Every employee was professional and thorough.

D F.
Feb 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
Great job professional employees

Charles A.
Feb 2018
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
They were professional and very punctual.

Shann H.
Oct 2017
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
Outstanding service
Response from GSM Services
"Thank you for leaving a review."

Mac C.
Oct 2017
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
Excellent, prompt and professional
Response from GSM Services
"Thank you for your business and taking the time to leave us a review!"

Lee R.
Oct 2017
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
$12,000
GREAT Job, very professional
Response from GSM Services
"Thank you for your business!"

Andrew R.
Jun 2017
4.0
Heating and Air Conditioning Service
Yes, I recommend this pro
We have a contract with them. They are very quick to respond. They are always there. They did what they said they were going to do, and what I felt was needed. They addressed my issues pretty well. Anytime I've had any issues with my questioning, one technician's capacities against the company, they addressed it pretty well, and they sent me somebody else. There are discrepancies between the technicians.

Rick E.
Jun 2017
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
They come out and service twice a year.

Patrick R.
May 2017
5.0
Heating and Air Conditioning Service
Yes, I recommend this pro
I'm pretty picky and GSM exceeded my expectations on every level. They truly care about their customers. Five stars.

BELLE H.
Apr 2017
5.0
Heating and Air Conditioning Service, Insulation
Yes, I recommend this pro
$8,559
I've just been really pleased. The only thing that I kind of have a question about. They said the supervisor would come back out and show me pictures of what they had done under there after they got finished. He had some kind of a conflict and he didn’t come. I have to call and ask them to have him come. But I have the number of the man who talked to us at the begging and he is the one who told me always get pictures when somebody finishes, not just when they start. I think he will come or send whoever is supposed to come. I am not worried about that.
Showing 1-25 of 89

Licensing

Bonded

Insured

Licensed*

Trade License Number

11953 - NC: 3899 - SC: M2002

Trade License Expiration

11/06/2025

State Contractor License Requirements

All statements concerning insurance, licenses, and bonds are informational only, and are self-reported. Since insurance, licenses and bonds can expire and can be cancelled, homeowners should always check such information for themselves. To find more licensing information for your state, visit our Find Licensing Requirements page.

*Contact business to see additional licenses.

FAQ

GSM Services is currently rated 4.9 overall out of 5.

Monday: 8:00 AM - 8:00 PM Tuesday: 8:00 AM - 8:00 PM Wednesday: 8:00 AM - 8:00 PM Thursday: 8:00 AM - 8:00 PM Friday: 8:00 AM - 8:00 PM Saturday: 8:00 AM - 8:00 PM Sunday: 8:00 AM - 8:00 PM

GSM Services accepts the following forms of payment: PayPal, Financing Available, Check, Zelle, Venmo, CreditCard

Yes, GSM Services offers free project estimates.

Yes, GSM Services offers eco-friendly accreditations.

No, GSM Services does not offer a senior discount.

Yes, GSM Services offers emergency services.

Yes, GSM Services offers warranties.

GSM Services offers the following services: Air Conditioning Installation & Repairs • Furnace Installation & Repairs • HVAC Replacement • Insulation Services • Air Duct Cleaning • Dryer Vent Cleaning • FREE Home Energy Audits • Crawl Space Encapsulations • Crawl Space Repair • Home Generator Installations • Air Quality Solutions • Humidifiers • Dehumidifiers • Duct Replacement • Duct Repair

appliance repairs (refrigerators, dish washers, washer/dryers, etc.)