Mount Holly, NC HVAC & Home Services

AC Installation & Repair, HVAC Duct Cleaning, Insulation, Mold Removal & Crawlspace Service Experts in Mount Holly, NC

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

Duct Cleaning and HVAC System Cost in Mount Holly, NC

Need a new air conditioning system or duct cleaning services? Get a free instant quote online in just 30 seconds!

Heating & Cooling Services in Mount Holly, NC:

Crawl Space Services, Insulation & Other Home Comfort Services Offered in Mount Holly, NC:

AC Installation Experts

GSM Services specializes in energy-efficient heating and cooling system installations that enhance your home's comfort and save on energy costs. Our certified professionals ensure a smooth, reliable experience from start to finish. Book a FREE consultation online in seconds to explore ultra-quiet, high-efficiency systems that boost comfort, improve air quality, and lower energy bills. With clear pricing, flexible financing, and industry-leading warranties, upgrading your heating system has never been easier!

Air Conditioning Service & AC Repair in Mt Holly, NC

At GSM Services, our certified HVAC technicians inspect, service, repair, and replace all heating & cooling systems, any brand or model. Need a furnace repair? We'll waive the $69 diagnostic fee with your repair! Our licensed experts offer fast, affordable service, pinpointing issues with thorough inspections. Enjoy free service calls with repairs, upfront written estimates, and no surprises. All repairs come with outstanding warranties for your peace of mind.

Mount Holly's Crawl Space Pros

Struggling with moisture, mold, or damage in your crawl space? We’re here to help! Our experts transform crawl spaces into healthy, energy-efficient spaces. Get a FREE Crawl Space Inspection today! We will check the humidity level, look for any mold or growth, inspect your home's insulation and air duct system, air leakage, air quality and more! We can provide you different solutions to create a healthy, comfortable, and safe environment under and inside your home.

Crawl Space Services We Offer:

Home Insulation Company in Mt Holly, NC

We offer many insulation services such as insulation removal & insulation installation. As a full-service insulation contractor, GSM Services provides services to improve areas such as walls, crawl spaces, basements, and garages.

If you are in need of insulation services, let us perform a free inspection at your home! We will check the insulation levels, moisture levels, check for air leaks, inspect duct work, look for any growth, issues and more! We will take pictures of any concerns and give you a free, no obligation quote to offer solutions. At GSM Services, we are Mount Holly's trusted, local insulation company.

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

Expert Duct Cleaning in Mount Holly, 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!

Duct Cleaners in Mount Holly

Photo Galleries From Mount Holly

High efficiency GSM TruComfort air conditioner installation.

Trucomfort hybrid split system installation

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
  • Project Location: Mount Holly, NC
    Dryer isn't drying well, but it gets hot. Thinking I may need to have the dryer vent cleaned. Thanks! Additional information: Date requested: 09/08/2021
  • Project Location: Mount Holly, NC
    We would like to start having regular cleaning and maintenance.
  • Project Location: Mount Holly, NC
    Looking for a spray foam quote in attic space. Also, the removal of current blown fiberglass.
  • Project Location: Mount Holly, NC
    1. Regular service - need filter replaced in my AC unit. I would like to set up the ESA for tune-ups in spring/summer and fall/winter for 2020. Service tech will require a ladder as my unit is in my attic. 2. AC is struggling to cool the past few days. Would like it inspected as part of regular service. Would like to set up inspection for Monday 6/8 in the afternoon or Wednesday 6/10 in the morning. Additional information: Date requested: 06/08/2020
  • Project Location: Mount Holly, NC
    Summer tune up
  • Project Location: Mount Holly, NC
    Would like to get a quote for replacing a 5 ton heat pump at our shop facility.
  • Project Location: Mount Holly, NC
    HEATING SYSTEM WON'T COME ON
  • Project Location: Mount Holly, NC
    I need a air conditioner for our half basement
  • Project Location: Mount Holly, NC
    Air-conditioning fan on outside unit will turn on but no air is coming through vents inside the house
  • Project Location: Mount Holly, NC
    Two units upstairs aren't cooling
  • Project Location: Mount Holly, NC
    Need new equipment for HVAC on main level of home
  • Project Location: Mount Holly, NC
    I need someone to come and service my Mitsubishi outside unit. I believe there might be a leak.
  • Project Location: Mount Holly, NC
    Would like estimate on replacing existing AC
  • Project Location: Mount Holly, NC
    Heat pump is functioning but makes a lot of noise that's audible from inside the wall. Does not make noise when just the fan is running. Additional information: Date requested: 03/14/2019
  • Project Location: Mount Holly, NC
    Interested in a quote for a whole house standby generator.
  • Project Location: Mount Holly, NC
    Looking at replacement HVAC system
  • Project Location: Mount Holly, NC
    Need the furnace replaced for the bonus room over the garage. The a/c part of the unit still works. thanks!
  • Project Location: Mount Holly, NC
    Need quote for new HVAC. Current system won't cool when outside temp is above 80.
  • Project Location: Mount Holly, NC
    My AC unit iced over. Additional information: Date requested: 06/25/2018
  • Project Location: Mount Holly, NC
    Bonus room surrounded by attic space. Room temp climbs to upper 70's when outside temp gets to upper 80's. Air temp coming out of vents is 58-59 at night but climbs to 68-70 once outside temp gets to upper 80's. Concerned about duct leakage and general temp and ventilation of attic.
See all work requests
Serving the following Mount Holly, NC zip codes

28012 & 28120

Products & Services
HVAC Systems
  • air conditioning company
  • air conditioning systems
  • 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
  • air conditioning installation
  • air conditioning repair
  • heat pump installation
  • heat pump repair
Crawl Space Repairs
  • crawl space encapsulations
  • crawl space vapor barrier
  • crawl space cleanings
  • mold removal
  • 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
Before and After Pictures from Mount Holly
Before
After

Before and After Condenser Cleaning

Company Awards

2025 Best of Gaston

2025 Best Heating & Cooling Company

GSM Voted 2025 Community Choice Award Winner.

2023 Community Choice Award Winner - Best of Gaston

2024 Community Choice Award Winner

Voted Best Local HVAC Company in 2024.

2023 Community Choice Award Winner - Best of Gaston

2023 Community Choice Award Winner

Voted Best Heating & AC Company & Best Home Service Provider in the county.


2022 Best of Gaston

Best of Gaston 2022

GSM Services won Best Heating & Cooling Company and Top Place To Work in the County!


Best Contractor to Work For

Best Contractor to Work For - ACHR News

Named Best Contractor to Work For by ACHR News, a leading national industry publication in 2021.



2021 Best of Gaston

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 Mount Holly, NC

Job Locations and Reviews

Outdoor unit cleaning before and after
Outdoor unit cleaning before and after
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Outdoor unit cleaning before and after
Mount Holly, NC 28120
Air Conditioner Cleaning before and after
Air Conditioner Cleaning before and after
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Air Conditioner Cleaning before and after
Mount Holly, NC 28120
Attic Insulation Before and After
Attic Insulation Before and After
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Attic Insulation Before and After
Mount Holly, NC 28120
20 Mil Crawl Space Encapsulation with mold removal
20 Mil Crawl Space Encapsulation with mold removal
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20 Mil Crawl Space Encapsulation with mold removal
Mount Holly, NC 28120
Crawl Space Door Replacement
Crawl Space Door Replacement
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Crawl Space Door Replacement
Mount Holly, NC 28120
Generator Call, Performed an installation of a new Generac generator
Generator Call, Performed an installation of a new Generac generator
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Generator Call, Performed an installation of a new Generac generator
Mount Holly, NC 28120
Furnace Call, Performed an installation of a new furnace
Furnace Call, Performed an installation of a new furnace
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Furnace Call, Performed an installation of a new furnace
Mount Holly, NC 28120
Mount Holly, NC - Crawl Space Call, Performed an installation of a Sante Fe Dehumidifier
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Crawl Space Call, Performed an installation of a Sante Fe Dehumidifier
Mount Holly, NC 28120
Heat Pump Call, Performed a changeout of a heat pump
Heat Pump Call, Performed a changeout of a heat pump
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Heat Pump Call, Performed a changeout of a heat pump
Mount Holly, NC 28120
Guttering Call, Performed an installation of gutters
Guttering Call, Performed an installation of gutters
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Guttering Call, Performed an installation of gutters
Mount Holly, NC 28120
Mount Holly, NC - Package unit call, Performed an installation of a new package unit
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Package unit call, Performed an installation of a new package unit
Mount Holly, NC 28120
Mount Holly, NC - Package Unit Call, Performed an installation of a Goodman Package Unit.
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Package Unit Call, Performed an installation of a Goodman Package Unit.
Mount Holly, NC 28120
Dryer Vent Call, Before and After of a Dryer Vent Cleaning
Dryer Vent Call, Before and After of a Dryer Vent Cleaning
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Dryer Vent Call, Before and After of a Dryer Vent Cleaning
Mount Holly, NC 28120
Mount Holly, NC - AC call, Installed a new S Series Amana Unit
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AC call, Installed a new S Series Amana Unit
Mount Holly, NC 28120
Furnace & AC Install, TruComfort AC & Furnace Installation
Furnace & AC Install, TruComfort AC & Furnace Installation
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Furnace & AC Install, TruComfort AC & Furnace Installation
Mount Holly, NC 28120
Mount Holly, NC - Mini Split AC Installation. AC install.
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Mini Split AC Installation. AC install.
Mount Holly, NC 28120
Mount Holly, NC - Amana AC Install. New Air Conditioning Unit.
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Amana AC Install. New Air Conditioning Unit.
Mount Holly, NC 28120