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Products & Services

HVAC Systems
air conditioning contractors
air conditioning systems
boiler heating systems
central air conditioning
ductless air conditioning
gas furnace
geothermal heating and cooling
heating and cooling systems
high efficiency furnace
home heating systems
hvac companies
hydronic heating systems

Crawl Space Insulation

Home Energy Saving & Audit
energy efficiency audit
energy saving devices
energy saving products
energy saving tips
home energy audit
home energy conservation


Home Insulation
attic insulation
blown in insulation
cellulose insulation
duct insulation
green insulation
insulation contractors
pipe insulation
reflective insulation
rigid foam insulation
roof insulation
wall insulation
window insulation

Water Heaters
gas water heaters
high efficiency water heater
hot water heaters
indirect water heater
instant hot water heater
on demand hot water heaters
solar water heater
tankless water heaters
water heater installation
water heater replacement

Air Sealing
sealing air leaks
air duct leakage
air duct sealing
air leakage testing
door air seal
window air leakage

Radiant Barrier
radiant barrier insulation
radiant barrier cost
roof radiant barrier

ductwork repair
ductwork installation
ductwork cost
furnace ductwork
hvac ductwork
Duct Cleaning

Company Awards
GSM Services was chosen by its employees as a top workplaces winner among Charlotte-area companies.... [Read more]
Recognized as the Best of Gaston 2017 for the following categories: # 1 in Heating A/C Services # 1 in... [Read more] [Read more]
More Awards

Mount Holly's Leading Heating, Air Conditioning & HVAC Repair & Insulation Contractor

We appreciate your good quality work.  We are well satisfied....
Happy Customers Surrounding Mount Holly, NC
Work Requests

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Reviews From Mount Holly
Testimonials From Mount Holly
We couldn’t be happier with all aspects of your company! Thank you ever so much!
Testimonial by The Browns from Mt. Holly, NC
Your two technicians who did the installing were very hardworking, very knowledgeable and also courteous.
Testimonial by Ms. Stroupe from Mt. Holly, NC
We had a great experience with GSM.
Testimonial by Kris V. from Mt. Holly, NC

Mount Holly's Furnace Repair Experts

There are many reasons why your home’s heating system or furnace may not be working like it should (or working at all). Regular maintenance is important to prevent problems with your heating system and to keep your home comfortable and your energy costs low. Here at GSM Services, we can evaluate your current heating system and provide a fast quote to get your furnace running like new. We provide repair and maintenance services for oil, electric, gas, and propane furnaces.

Furnace Installation & Replacement

Is it time for a new furnace? Furnace replacement will be necessary if a major problem develops – such as a cracked heat exchanger. GSM Services is your local expert for heating system replacement. Before we replace your existing furnace, we will thoroughly inspect your heating system. If you require a new furnace, we can install a heating system that's right for you.

We install a variety of types of furnaces:

  • Gas furnaces
  • Oil furnaces
  • Electric furnaces
  • Propane furnaces
  • Heat pump systems

Schedule a FREE Estimate!

Insulating Your Mount Holly Home

We specialize in a variety of home energy improvement services that were aimed to lessen your home's carbon footprint and save energy and money each month! We offer it all, from air sealing to ductwork to various types of insulation services such as blown in fiberglass, cellulose, spray foam, injection foam, and more in Mount Holly, NC. We understand that you need to use the correct type of insulation in your home, and it needs to be placed in the correct areas.

Before we perform any insulation work in your home, we first take the time to conduct a custom home energy audit.  The audit is used to figure out what the root cause of your energy woes, and gives us an idea of what the best method would be to fix it.  At GSM Services, we not only test and investigate your home's energy usage, but we will discuss and prioritize the proper repairs. You'll know which ones will save you the most energy and why. This will also help direct you in making the best decision for you and your family.

Types of Insulation
  • Blown-in Fiberglass
  • Blown-in Cellulose       
  • Rigid Foam
  • Injection Foam
  • Radiant Barrier  
  • Sealing Air Leaks
  • Air Duct Sealing            
Areas of Home
  • Attic Insulation
  • Basement Insulation
  • Crawl Space Insulation
  • Garage Insulation
  • Wall Insulation
  • Floor Insulation
  • Ductwork Insulation

Heating & Air Conditioning Repair, Installation & Maintenance Service Contractor 

As Mount Holly's trusted air conditioning and heating systems repair contractor, you can rest assured that we will get the job done right the first time! Since 1927, we have repairing homeowner's heating and air conditioning systems 

If you feel that your home's HVAC system is not working as it should, we can fix that. We offer maintenance, repair, and installation services of all kinds of heaters. Did you know that having an efficient heating unit will not only help keep your home warmer in the winter months, but can greatly improve the air quality of your home?  

Along with heating repair, we also offer a wide variety of air conditioning system services. Having heat is a necessity for home owners in the Greater Charlotte area, especially in the winter.  Our team of HVAC repair & service professionals can replace any heating system from furnaces to boilers and oil to gas and electric heaters, so no matter what sort of heating your home uses, we can make your you're never left out in the cold.

  • Gas Furnace
  • Oil Burners
  • Geothermal
  • Electric Furnaces
  • Heat Pumps
  • Wood Heating
  • Forced Air Heaters
  • Gas Boilers
  • Oil Boilers
  • Hot Water Heater
  • Tankless Water Heaters 
  • Central Air Conditioning
  • Ductless Air Conditioning
  • Evaporative Air Conditioning
  • AC Repair & Installation
  • Dehumidification
  • Heat Pumps
  • Ductwork Cleaning
  • Ductwork Sealing 
  • Ductwork Repair
  • Air Purification

Comprehensive Home Energy Audits

Our team of home energy take the time to carefully examine your home and can provide comprehensive home energy audits that identify the areas that need improvement. Once we finalize the test, we will sit with you and show you exactly what was found and giving you a prioritized list of list of home energy tasks. Our custom home energy audits allow us to help homeowners improve the overall energy efficiency of their home's and can help save you money!

Evaluations Include:
  • Air Leak Inspection 
  • Thermal Scanning
  • Detailed Explanation    

  • Blower Door (Infiltrometer) Test
  • Insulation Level Check
  • Appliance & Lighting Checks

Schedule a FREE Estimate!

Crawl Space Insulation Experts

Is there moisture in your crawl space? Does your home have proper crawl space insulation? Even if you think your crawl space has enough insulation do not hesitate to contact us. We have a team of crawl space moisture and insulation experts that will give you peace of mind when it comes to your crawl space. It is always better to have too much insulation than to have a space without any insulation at all. Crawl space insulation is very important to the efficiency of your entire home due to the fact that moisture in your crawl space can also lead to rot, structural issues, and health concerns. Don't let moisture in your crawl space plague your home. Contact us today to learn more about our crawl space moisture solutions!

Job Stories From Mount Holly, NC
New Installation Multiple Furnace Systems - Local Church

From residential to light commercial our residential heating and cooling division will help keep your home or business comfortable.  We recently completed a 5 unit furnace installation at a local Church in Mount Holly, NC. 


Give GSM a call for a free estimate for new installations on heating and cooling systems for light commercial and residential homes.

Work Requests From Mount Holly, NC
S Mulberry Court in Mount Holly
I feel I have leaks in my duct work. The vents in 2 bedrooms on one end of the house barely blow. There are odd smells like I could have back drafts. Also seeing a lot of dust. Would also like a quote for new ac unit, as I have a small Freon leak in mine.
West Catawba Ave in Mount Holly
Insulation under home needs repair and /or replacement. Place vapor barrier.
Riverfront Parkway in Mount Holly
Need a second quote on a furnace and possible ac replacement. first floor crawl space unit.
Huckleberry Lane in Mount Holly
I need to get my furnace checked.
Over Look Ct in Mount Holly
I need a quote on replacing a heat pump and air conditioner at my home.
Stockbridge Dr in Mount Holly
Whole house generator price
Stockbridge Drive in Mount Holly
Moisture in my crawl space causing mold growth and damage to insulation. I am interested in an evaluation.
Jenkins Ave in Mount Holly
I have window units baseboard electric heating system and I want to replace them with central heat and air. My house is about 1000-1200 sq ft. Please give me a quote and we are also interested in financing.
Briarwood Lane in Mount Holly
Looking for ways to improve the cooling of my house
Sandy Ford Rd in Mount Holly
Air unit keeps freezing up and we have a 82 year old that lives with us and he doesn't like to be hot
Julia St in Mount Holly
Have old system (1979) heat pump/R22 that is leaking/freezing over. Have made multiple attempts to patch. Need estimate on replacement unit for heating/AC. House is 1050 sq ft. Duct work is ok, may need some hangers in a couple spots to re-secure. Prefer 15 Seer or higher. Need estimate.
Moores Branch Rd in Mount Holly
Need air conditioner checked out.
E Glendale Ave in Mount Holly
Need attic knee walls sealed and insulated.
Tom Sawyer Ln in Mount Holly
I have an island that is made for a downdraft cooktop; however, they never installed the ductwork. I need the ductwork put into the cabinet, a hole cut through the bottom of the island to the floor, and the duct ran approximately 10 feet to the outside of the home. Is this something that GSM can do?
Emanual Ct in Mount Holly
Our Sanidry dehumidifor has quit working..I went under the house and believe the engine is burnt up..I have shut the unit off but would like some to come fix it Thanks
Brookstone Drive in Mount Holly
This person has filled out the Star Power Pro survey on that you sent them and is interested in another service you provide: heating & cooling. Please contact them to schedule a new appointment for this service. This is a no-charge lead.
Lighthouse Rd in Mount Holly
Ductwork has condensation in my basement and causing mildew/mold on ceiling tiles. I believe it poor insulation
Elk Court in Mount Holly
Our heating and air units have gone out and need to be replaced. We are looking for an estimate. We are also looking for someone to come and see us this week if possible.
Old Mine Rd in Mount Holly
Attic insulation