Furnace Repair, HVAC Replacement & Install in Denver, NC
For 99 years, GSM Services has been the trusted choice for Furnace repair, HVAC replacement, installation, and maintenance services in Denver, NC. Our certified technicians deliver fast, reliable service and honest, upfront pricing. We're dedicated to improving your home's comfort, air quality, and energy efficiency. Enjoy easy online scheduling, instant online quotes, and FREE service calls with repairs!
Why Locals Choose GSM Services:
- ✅ Fast, Affordable & Reliable
- ✅ Licensed and Insured
- ✅ Locally Owned for 99+ Years
- ✅ Voted Best Heating & Cooling Company
- ✅ 100% Guaranteed Satisfaction
- ✅ Outstanding Warranties
- ✅ Unbeatable Financing for Any Budget
- ✅ FREE HVAC Service Calls with Repairs
- ✅ FREE Online HVAC System Quotes
- ✅ FREE Insulation, Crawlspace and Home Energy Audits
How Much Does a New Heating & Cooling System Cost in Denver, NC?
The cost of a new HVAC system in Denver, NC typically ranges from $8,000 to $20,000+ in 2026, depending on the size of your home, the efficiency of the system, ductwork requirements, and installation complexity.
Want to know what a new Furnace may cost for your home? Use our HVAC Cost Calculator to get instant Heating System replacement pricing in Denver, NC. Compare system options, estimated monthly payments, and personalized HVAC installation costs in minutes—before scheduling an in-home consultation.
Duct Cleaning & Heating System Prices in Denver, NC
Get your free instant quote online in just 30 seconds!
Heating & Cooling Services in Denver, NC:
Crawl Space, Insulation, Generators & Other Home Services We Offer in Denver, NC:
Furnace Repair in Denver, NC
If your Heater isn’t working, trust GSM Services for fast, affordable Furnace repair in Denver, NC. Our licensed HVAC technicians service all makes and models, provide expert solutions, and offer clear, upfront pricing with no hidden fees. We also include a free service call with any repair.
Furnace Replacement & Installation in Denver, NC
Looking for a New Heating System? Our licensed HVAC installers in Denver, NC are certified experts in energy-efficient heating & cooling systems that can lower your energy bills by up to 30%. We’ll walk you through the latest HVAC options and help you choose the right system for improved comfort, quieter operation, and cleaner indoor air. Book online today for a free, no-obligation consultation and quote!
Certified Service for All Types of Heating & Cooling Systems
- Central Heating & Air Conditioning Systems
- Ductless Mini Splits
- Package Systems
- Heat Pump Systems
- Gas furnaces
- Oil furnaces
- Electric Furnaces
HVAC Duct Cleaning Services in Denver, NC:
Our duct cleaning services thoroughly clean your entire duct system—not just the air vents—to ensure optimal air quality and system efficiency. We start with a full inspection, checking for tears, leaks, or any issues that could affect performance. Our comprehensive cleaning service includes a special disinfectant spray treatment to leave your ducts fresh and sanitized. Get a free, instant online quote in seconds and breathe cleaner air with our professional duct cleaning services!
Insulation Services in Denver, NC:
GSM Services is your trusted local insulation company in Denver, NC. We provide high-quality, affordable home insulation for attics, walls, crawl spaces, basements, floors, garages and more. Our certified experts use various insulation types to fit your home and budget, helping reduce energy bills and improve comfort and air quality year-round. Experiencing uneven temperatures or high utility costs? Schedule your free insulation inspection today! We’ll assess current insulation, check for air leaks or moisture issues, and provide a custom, no-obligation quote for your home. Call or book online now!
Photo Galleries From Denver
Full crawl space encapsulation; dehumidifier; silver-glo treatments in knee walls; air sealing; blown in insulation. A full comfort and energy upgrade job. Homeowner is already feeling better comfort!
Wow you wouldn't believe the situation here with a new house! Do you ever smell a stagnant smell in your new home? Consult the professionals here at GSM where we provide comfort and peace of mind every call, every customer, everyday!
Work Requests From Denver, NC
- Project Location: Denver, NC
Air unit is frozen - Project Location: Denver, NC
We are interested in obtaining a Home Energy Audit - Project Location: Denver, NC
I am looking for quotes on a new HVAC system. - Project Location: Denver, NC
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. - Project Location: Denver, NC
New heat pump - Project Location: Denver, NC
Purchased a home recently: do I need more insulation in the attic? - Project Location: Denver, NC
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? - Project Location: Denver, NC
Attic insulation and Shed insulation - Project Location: Denver, NC
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! - Project Location: Denver, NC
Interested in a quote to replace 16 year old Trane AC unit that has stopped working and will not cool house. - Project Location: Denver, NC
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! - Project Location: Denver, NC
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. - Project Location: Denver, NC
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. - Project Location: Denver, NC
We need a new HVAC system and would like a quote - Project Location: Denver, NC
Need quote to have French drain added inside crawlspace and have crawlspace and sealed - Project Location: Denver, NC
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. - Project Location: Denver, NC
Interested in a quote to have the unerside of my roof deck sprayed with foam 1974 double wide with a 2/12 pitch - Project Location: Denver, NC
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 - Project Location: Denver, NC
Would like to schedule the $98 precision cooling tune up - Project Location: Denver, NC
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
See all work requests
Products & Services
HVAC Systems
- air conditioning company
- air conditioning systems
- HVAC Replacements
- central air conditioning
- ductless air conditioning
- gas furnace
- geothermal heating and cooling
- HVAC tune ups
- high-efficiency HVAC systems
- ductless heating systems
- HVAC companies
- furnace installation
- furnace repair
- AC installation
- AC repair
- heat pump installation
- heat pump repair
Crawl Space Repairs
- crawl space encapsulations
- crawl space vapor barrier
- crawl space cleanings
- dehumidifers
- crawl space inspections
Home Energy Audits
- energy efficiency audit
- air leakage testing
- blower door testing
- crawl space inspection
- attic inspection
- insulation inspection
Home Generators
- generator installation
- generator repair
- generator service
Home Insulation Services
- attic insulation
- insulation installation
- insulation inspections
- insulation removal
- insulation company
- blown in insulation
- cellulose insulation
- duct insulation
- green insulation
- insulation contractors
- pipe insulation
- reflective insulation
- rigid foam insulation
- roof insulation
- wall insulation
- window insulation
- Crawl Space Insulation
- radiant barrier insulation
Air Sealing
- sealing air leaks
- air duct leakage
- air duct sealing
- air leakage testing
- door air seal
- window air leakage
Air Duct Cleaning
- duct cleaning services
- duct disinfectant spray treatment
- air vent cleaning
Ductwork
- ductwork repair
- ductwork installation
- ductwork cost
- furnace ductwork
- HVAC ductwork
- duct cleaning
Dryer Vent Cleaning
- dryer vent cleaning services
- dryer vent replacement
Company Awards
2026 Best Heating & AC Company
GSM Services Named 2026 Best of Gaston Winner for Best Heating & Cooling Company.
2025 Best Heating & Cooling Company
GSM Voted 2025 Community Choice Award Winner.
2024 Community Choice Award Winner
Voted Best Local HVAC Company in 2024.
2023 Community Choice Award Winner
Voted Best Heating & AC Company & Best Home Service Provider in the county.
Best of Gaston 2022
GSM Services won Best Heating & Cooling Company and Top Place To Work in the County!
Best Contractor to Work For - ACHR News
Named Best Contractor to Work For by ACHR News, a leading national industry publication in 2021.
Top Place to Work in Charlotte
GSM was recognized as one of the Top Places to Work in 2019 by The Charlotte Observer.
Recent Jobs and Reviews in Denver, NC
Denver, NC at a glance
GSM Services has completed 7 jobs in Denver, NC between February 2022 and July 2026.
The most recent job was on July 20, 2026.
GSM Services has completed 1 job in Denver, NC in the last 12 months. The first job there was in February 2022.
Job Locations and Reviews
We completed HVAC airflow improvements to help address a front bedroom that was consistently warmer than the rest of the home. Our team modified the supply ductwork by replacing the existing branch configuration with dedicated supply runs to improve airflow to the room. We also relocated a supply register from the closet to a more effective sidewall location for better air distribution. In addition, we insulated an uninsulated interior wall gable with Borofoam insulation to help reduce heat transfer and improve the room's overall comfort and energy efficiency.
Crawlspace Call, Performed an encapsulation & installed a sump pump in the crawlspace
Crawl Space Call, Performed a replacement of the crawl space door
Dryer Vent Call, Before & After of a dryer vent cleaning
Installation Call, Performed an changeout of unit, installing two Mitsubishi mini split systems.
Generator Call, Performed an installation of a Generac Generator.
Phenomenal Aire installation. Air Purification in Denver, North Carolina.