Expert Furnace Repair, HVAC Installation, Insulation, Crawlspace and Duct Cleaning Services in Cornelius

For over 98 years, GSM Services has made home comfort easy with trusted service, reliable solutions, and top-quality work in Cornelius. As a licensed and insured home comfort specialist, we offer heating & cooling, insulation, air duct cleaning, crawlspace services to improve comfort, air quality, and energy efficiency. Enjoy easy online booking, instant quotes, and free service calls with any repair!

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Why Locals Choose GSM Services:

✅ Fast, Affordable & Reliable
✅ Licensed and Insured
✅ Locally Owned for 98+ Years
✅ Voted Best Heating & Cooling Company
✅ 100% Guaranteed Satisfaction
✅ Outstanding Warranties
✅ Unbeatable Financing for Any Budget
✅ FREE HVAC Service Calls with Repairs
✅ FREE System Quotes
✅ FREE Insulation, Crawlspace and Home Energy Audits

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New HVAC System Cost & Duct Cleaning Prices in Cornelius

Need HVAC or duct cleaning? Get your free instant quote online in just 30 seconds!

HVAC INSTALLATION

DUCT CLEANING

DRYER VENT CLEANING

Heating & Cooling Services in Cornelius:

Crawl Space, Insulation, Generators & Other Home Services in Cornelius:

Furnace Repair in Cornelius

If your Heater isn’t working, trust GSM Services for fast, affordable Furnace repair in Cornelius. 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.

HVAC Replacement & Install Experts

Looking for a New Heating System? Our licensed HVAC installers in Cornelius 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 AC options and help you choose the right system for improved comfort, quieter operation, and cleaner indoor air. Call or book online today for a free, no-obligation consultation and quote!

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Certified on 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

Cornelius Crawl Space Repair & Service Contractors

GSM Services provides professional crawl space services in Cornelius. Our team protects your home from moisture damage and mold, enhancing air quality, boosting energy efficiency, and reducing pests. A well-maintained crawl space also strengthens structural stability and overall comfort. Book a free crawl space inspection and quote online today!

Crawl Space Solutions:

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Duct Cleaning Services in Cornelius:

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 Service Company in Cornelius:

GSM Services is your trusted local insulation company in Cornelius. 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!

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Photo Galleries From Cornelius

Super attic. Cooler in summer, warmer in the winter.

News & Events From from Cornelius

Start 2017 with saving Energy, Money, & the Planet!

Home improvements are a great way to start off your new years resolution of "saving money". Take a look at your heating and cooling costs and have a Whole Home Energy Evaluation done.... [Read more]

Is a wifi thermostat right for your home?

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]

Save Energy on Heating with This List

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]

More News & Events

Work Requests From Cornelius, NC

Project Location: Cornelius, NC
AC not keeping up. Cold air is not coming out.
Project Location: Cornelius, NC
Looking to lower energy bills and have better air flow in certain areas of house.
Project Location: Cornelius, NC
I have uneven heating and cooling in my home. Also have "stale" smells in certain places. Need thermostats updated so I can control them all remotely. I have 7 or 8 A/C units - 12000 sq ft home. I'd like a Home Energy audit. Best dates will be early in the week of 6/25.
Project Location: Cornelius, NC
Would like spray insulate the walls of my. Home it's hot in the summer cold in the winter.
Project Location: Cornelius, NC
Want to add extra insulation in our attic space. House is 2 years old and is all one level.
Project Location: Cornelius, NC
Need my AC serviced not cooling adequately.
Project Location: Cornelius, NC
Quote please. Whole house air cleaner.
Project Location: Cornelius, NC
We have 2 rooftop HVAC units and are looking for a quote for annual maintenance.
Project Location: Cornelius, NC
Do you do whole house surge protectors? We have one you installed for the HVAC but was wanting to know about protecting the whole house. Thank you Cecelia
Project Location: Cornelius, NC
House take a long time to cool and does not stay cool long. There are also uneven temps in rooms. I would like an energy audit to determine what can be done to lower a/c costs and make the house more comfortable.
Project Location: Cornelius, NC
Our upstairs air conditioner is not working properly.
Project Location: Cornelius, NC
Cold air coming in from around fireplace and some outlets. I have high ceilings and gas heat; can't seem to keep my living areas warm enough.
Project Location: Cornelius, NC
Vapor barrier not working well. Would like to seal off crawl space.
Project Location: Cornelius, NC
We just bought a home and it is very drafty. Looking for a company to assess where we are losing heat
Project Location: Cornelius, NC
I recently purchased a home built in 1970. I know that I need to add additional insulation to my attic space, but I'm also interested in a home energy inspection.