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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

Before and After Pictures from Dallas
Heating - Before and After - Tune Up

Heating - Before and After - Tune Up

Before After
Heating - Before and After - Tune Up Heating - Before and After - Tune Up

Our residential service technicians do routine system check ups and service for our customers to help their heating and cooling systems run smoothly when you need them the most.

For customers, peace and mind are the two most things that they want when it comes to their home comfort. Customers don't typically see the work that is performed on their systems - Most furnaces are either in the attic or crawlspace of a home (out of site out of mind). 

Our technicians leave the systems cleaner than they find them.  Sometimes dirt, dust and other things in the air can dirty a system. We make sure to leave your heating and cooling system the cleanest possible. 


See photos for a before and after of a furnace in a crawlspace on a recent tune up.

Furnace Cleaning/Tune Up

Furnace Cleaning/Tune Up

Before After
Furnace Cleaning/Tune Up Furnace Cleaning/Tune Up

Furnace tuneups are not only good for safety purposes but it also helps the efficiency of your heating system.

Company Awards
Best of Gaston 2020
GSM Services was incredibly honored to win multiple titles this year for the 2020 Best of Gaston Awards! Thank you... [Read more]
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]
More Awards

Dependable Energy Audit, Heating & Air Conditioning in Dallas, NC

Thanks for giving me some extra special care while my system was being fixed....
Happy Customers Surrounding Dallas, NC
Work Requests

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

Reviews From Dallas
Testimonials From Dallas
We wouldn't ever consider anyone else to do our Heating and Cooling needs.
Testimonial by Jim & Linda L. from Dallas, NC
Scott was great, every tech that you have sent out has been great!
Testimonial by B M. from Dallas, NC

Fast & Affordable Heating Service Specialists in Dallas, NC

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

Dallas'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 Dallas, 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 Dallas
Do you need a wifi thermostat in your home? How much does a wifi thermostat cost? What makes a wifi thermostat smart? How much money can you save with a wifi thermostat?... [Read more]
High energy bills can come as a surprise in the winter. In our service area, air conditioners see a lot more use than heaters. When temperatures drop, homeowners might feel relieved as bills start to lower as well-until the heater becomes more and more of a necessity.... [Read more]
Work Requests From Dallas, NC
Project Location: Dallas, NC
My heat pump won't run heat
Project Location: Dallas, NC
Seems to be an issue w/ heating element in the crawl space.
Project Location: Dallas, NC
I need my dryer vents cleaned
Project Location: Dallas, NC
Crawl space moisture
Project Location: Dallas, NC
My AC is not working like it should. Came home yesterday to my house 78 degrees, it was set for 73. It was blowing out but not cool air. Changed my filter. When I woke up this AM it had came down to 75 degrees. Thanks
Project Location: Dallas, NC
You do my every 6 month service. My indoor part of my ac is leaking water so it's off and I have no ac. I want to replace my whole heating and air system so that it's all outside. It's a 4 ton unit and you have all the info on it. I need a cost please
Project Location: Dallas, NC
Tune up/system service for summer
Project Location: Dallas, NC
Estimate on Geothermal Heat Pump Installation
Project Location: Dallas, NC
My outside unit is old and has been going out. I've had a lot of work done on it over the years, but I feel it is time to replace the unit. I can't afford to pay upfront and was wondering if you have financing available?
Project Location: Dallas, NC
Hello, recently I had another business come and replace a fan motor and blade on an HVAC unit. It is now been making a very loud noice when turned on. The other business said they tried everything to quiet it down but they couldn't stop it or make it quieter. How much does it cost to come and look at the unit?We do need to replace our units they are 20 years old but I am unsure we can afford it right now. Thank you.
Project Location: Dallas, NC
Coils need to be cleaned, AC much cooler downstairs than up. Additional information: Date requested: 05/25/2020
Project Location: Dallas, NC
Looking to get a mini split system installed
Project Location: Dallas, NC
I just wanted to get a quote for duct cleaning for single story house. 10 vents, 1 return , was told that there are 3 main ducts under house instead of one main with ducts branching off. Please email me with a quote. Thank you
Project Location: Dallas, NC
Schedule a pre-paid cooling precision tune-up
Project Location: Dallas, NC
Generac full home generator assessment, quote, installation & service.
Project Location: Dallas, NC
Our central air has went out & we are in need of a new one so we would like to know about how much a new one would be plus installation and if you guys offer financing.
Project Location: Dallas, NC
Moisture and water intrusion in my crawl space
Project Location: Dallas, NC
I was interested in obtaining an estimate for maintenance for my a/c unit. As of right now, I do not have it serviced regularly but would like to if it is not too expensive.
Project Location: Dallas, NC
2 items. At the moment, my air is not functioning very well - may be low on freon and needing a recharge, at least it feels that way. Also, I'd like to get an estimate on a new heat pump split system. My current system is 20+ years old so it's way past time. Probably won't need new duct work, but it's possible they would need to be sealed up some. Thanks.
Project Location: Dallas, NC
We just bought a home and would like to have the hvac serviced to make sure it runs well through the summer.