Welcome to Cornerstone Heating & Air Conditioning, Inc.
We do it right the first time!
A Legacy of Excellence in HVAC
At Cornerstone Heating & Air Conditioning, Inc., we believe in doing things right — the first time. Founded with a passion for helping families and businesses stay comfortable year-round, our journey began over four decades ago in Frederick County, Maryland.
For over 42 years, Cornerstone Heating & Air Conditioning, Inc. has been a trusted name in HVAC services across Frederick County and beyond. From custom-designed systems to expert installation and reliable maintenance, we are your go-to team for total indoor comfort.
We are so glad you are here...
How Can We Best Serve You?
Whether you need a repair, a seasonal tune-up, or a full system replacement, we’re here to help with precision and care. We design, install, and maintain all types of ducted and non-ducted HVAC systems.
Our Services Include:
HVAC System Sales & Installation
Geothermal Heating & Cooling
Heat Pumps (Air & Ground Source)
Gas & Oil Furnaces
Seasonal Maintenance
Light Commercial HVAC up to 15 Tons
Steam & Hot Water Boilers
Geothermal Heating & Cooling
Heat Pumps (Air & Ground Source)
Gas & Oil Furnaces
Indoor Air Quality Assessments
Proudly Serving Maryland & Pennsylvania
We’re your local HVAC experts across a wide service area, bringing comfort to homes and businesses alike. With quick response times, local knowledge, and a deep understanding of regional climate needs, you can trust Cornerstone for reliable comfort.
Primary Service Areas:
Frederick County, MD
Washington County, MD
Montgomery County, MD
Howard County, MD
Carroll County, MD
Adams County, PA
Live nearby but don’t see your location listed? Give us a call — we may still be able to help!
Why Choose Cornerstone Heating & Air Conditioning, Inc.?
When it comes to your home’s comfort, you need more than just a contractor — you need a partner you can trust. At Cornerstone Heating & Air Conditioning, Inc., we’ve built our reputation on honesty, quality, and a relentless commitment to doing things the right way, from day one.
01
42+ Years of HVAC Experience
With decades of hands-on expertise, we bring unmatched knowledge and problem-solving to every project — from routine tune-ups to complex system installations.
02
Certified, Skilled Technicians
Our team is professionally trained and certified, including factory training with top-tier brands like Bosch. We do the job right the first time, every time.
03
Custom Solutions for Your Comfort
No two homes or systems are alike. We assess your unique needs and provide tailored heating and cooling solutions that maximize efficiency and comfort.
04
Flexible Financing Options
We offer convenient financing plans (with approval) to make your HVAC investment manageable — without compromising on quality or reliability.
Experience the Cornerstone Difference.
We’re not here to sell — we’re here to serve. Let us earn your trust and show you what true HVAC excellence looks like.
