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Products & Services

HVAC Systems
air conditioning contractors
air conditioning 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
air conditioning installation
air conditioning repair

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

Dryer Vent Cleaning

Company Awards
Top Place to work Charlotte 2019
GSM was voted as one of the top places to work in 2019 by the Charlotte Observer.... [Read more]
Best of Gaston 2019
We won Best of Gaston 2019 for Best Heating & Air Conditioning Company and also Best Home Repair Company by... [Read more]
Top Place to work Charlotte 2018
GSM Services was voted for the second year in a row as one of the best places to work in... [Read more]
More Awards

Denver, NC's Leading HVAC and Furnace Service & Installation Company

Happy Customers Surrounding Denver, NC
Work Requests

Click the icons to see what our customers had to say.

Fast & Affordable Heating Service Specialists

If your furnace won't turn on, if there's a leak, if the blower isn't working or if you want regularly scheduled maintenance, you are in the right place! GSM Services has a dedicated and devoted team of furnace service professionals with decades of combined experience. Our trained technicians can provide a prompt and thorough inspection of your unit to determine the problem and suggest the solution. Our furnace service team provides FREE written estimates for all potential furnace repairs so you will never be surprised by the bill. Also, we provide furnace service for all types and models, including natural gas, oil, electric and propane. Don’t hesitate to contact us today, call or click to schedule your furnace service appointment with GSM Services!

Benefits of regular furnace service:

  • Optimal home comfort
  • Reliable performance
  • Better furnace efficiency
  • Extended life
  • Lower repair costs & increased energy savings

Proven Furnace Installation Experts

If your furnace is old or your bills seem too high, replacing your furnace will be the best option. Basic usage compromises your unit over time and keeping a damaged or old furnace may be costing you more money than installing a new unit. Our certified and highly trained team of furnace installation professionals can provide a thorough inspection of your unit to help you make that decision. Our skilled experts can replace all types of units with high-quality and energy efficient models that are guaranteed to lower your energy bills by as much as 30%. Trust our furnace installation professionals to provide you with reliable services every step of the way. Call or click today to schedule your FREE furnace installation estimate!

We install a variety of types of furnaces:

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

Denver's Dependable Home Insulation Professionals

We specialize in a variety of home insulation services that are 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, injection foam, and more in Denver, 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

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!

Air Conditioning Repair, Installation, & Service Company

Here at GSM Services, our skilled technicians can inspect your air conditioning system and provide the right services to prolong the life of your cooling system and keep your home comfortable. We provide repair and maintenance services for all brands and models of central and ductless air conditioners.

Our Air Conditioning Services Include:

  • Air conditioning tune-ups & maintenance
  • Air conditioning repair
  • Air conditioning system replacement
  • Refrigerant replacement
  • Thermostat repair & replacement
  • Ductless air conditioning
  • Central air conditioning

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
News & Events From from Denver
Repair or replace your heating and air conditioning system?
This is the question that most homeowners don't want to think about. No one wants to think about their air conditioning going out during the middle of summer or their heat going out on below freezing days. Read below on ways we can help you out in the long run.... [Read more]
Work Requests From Denver, NC
Vicinity of Broadleaf Drive in Denver
We are interested in obtaining a Home Energy Audit
Vicinity of Perry Cove Lane in Denver
I am looking for quotes on a new HVAC system.
Vicinity of Tranquil Harbor Ln in Denver
My upstairs AC unit does not keep the area cool. Trying to determine if I need more insulation, improved ventilation or a new AC unit.
Vicinity of Sisters Lane in Denver
New heat pump
Vicinity of Windsong Road in Denver
Purchased a home recently: do I need more insulation in the attic?
Vicinity of Hagers Ferry Road in Denver
We have lived in our new house for going on 2 years and we are still getting used to our hybrid propane / electric heating system. We paid about $2,300 this past year on propane which seems like we're throwing away our money. Therefore, we are wondering if it's possible to switch the hybrid system to stay on electric heating regardless of how cold it gets outside (I think once it gets cold enough the propane kicks on) but still have the propane for our gas fireplace. I read somewhere that you can adjust the amount of propane used for heating? All of this is new to us. Is this something that can be done? And can you guys help us out with this?
Vicinity of Malibu Pointe Lane in Denver
Attic insulation and Shed insulation
Vicinity of Durango Way in Denver
Hello, I am interested in the silver plan for regular check ups. The math of $14.95 monthly equals $180 but your website shows $194. Each plan you offer the monthly charge does not equal the annual charge if you could please explain the difference. I am interested in a heat system service in the next week if possible. Thank you!
Vicinity of DRURY LN in Denver
Interested in a quote to replace 16 year old Trane AC unit that has stopped working and will not cool house.
Vicinity of Executive Circle in Denver
Request quote for blown in insulation for our 24x56 mobile home. Would like to have this done sometime this summer. Please send via email as it is difficult for me to answer my personal phone during the day. Thanks!
Vicinity of E. Berkeley Rd. in Denver
Would like to have a second floor overhang insulated w/ spray foam, but do not know the cost. Existing home, overhang area is 40'(L) x 2' (W) x 1' (D), and overhang is accessible and currently without insulation nor house wrap.
Vicinity of in Denver
Approximately 14000 sq ft commercial roof repair/replace. Roof leaks badly and needs repair. I need a detailed professional estimate and bid. Please contact me for further information.
Vicinity of Dellingdowns Dr in Denver
We need a new HVAC system and would like a quote
Vicinity of Governors Island Drive in Denver
Need quote to have French drain added inside crawlspace and have crawlspace and sealed
Vicinity of Cottonwood Dr in Denver
Contractor forgot to install insulation between basement family room and main floor family room. Can you blow in insulation? Intent was mainly for sound deadening. Room is approx. 23' x 23' and finished.
Vicinity of Executive Circle in Denver
Interested in a quote to have the unerside of my roof deck sprayed with foam 1974 double wide with a 2/12 pitch
Vicinity of Nautical Court in Denver
I have two air units. The upstairs until in working properly. The downstairs unit will turn on but no air comes out of the vents. Need assistance
Vicinity of Pine Lake Road in Denver
Would like to schedule the $98 precision cooling tune up
Vicinity of Osprey Run Court in Denver
Would you please advise the cost of a home energy audit. I don't know if it depends on the size of the house, but if so, our house is approx 4200 sq. ft. Thanks much. Leslie
Vicinity of Eagle Pointe Court in Denver
We would like to add blown in insulation in our attic. I would like to schedule an estimate for next week 8/8 or 8/9. Thank you! Additional information: Date requested: 08/08/2016