Cornerstone Heating & Air Conditioning

Cornerstone HVAC of Thurmont, MD, has been serving the Frederick and Washington Counties communities for over 30 years. We pride ourselves on delivering exceptional, high-quality HVAC services at affordable rates, ensuring your home remains a comfortable oasis no matter the weather. Our commitment to customer satisfaction is unwavering, and we go above and beyond to understand your unique needs and provide tailored solutions.

Our Mission

Our mission is to become your trusted partner for all your heating and cooling requirements. We strive to exceed expectations by offering transparent, honest service and employing skilled technicians who are dedicated to providing expert repairs, installations, and maintenance.

Experienced and Knowledgeable Team

At Cornerstone HVAC, our team comprises factory-trained and seasoned technicians with a wealth of experience in the industry. We stay abreast of the latest advancements and technologies, enabling us to recommend and implement the most effective solutions for your home. Our technicians are not satisfied until the job is done right the first time.

Services Offered

We offer a comprehensive range of HVAC services, including:

• Heating System Repair:

From oil heat and boilers to geothermal systems, gas heat, and heat pumps, our experts can pinpoint and resolve any heating issues, ensuring your cozy winter comfort.

• Geothermal Systems Installation: We specialize in installing efficient and environmentally friendly geothermal systems, optimizing your home's energy performance and reducing your carbon footprint.
• Air Conditioning Repair:

We diagnose and repair air conditioning problems promptly and efficiently, keeping you cool and comfortable during the hottest months.

• Heat Pumps: We provide expert installation and maintenance of heat pumps, offering year-round heating and cooling solutions for your home.

• Oil Burner Service:

Our technicians specialize in oil burner maintenance, repair, and installation, ensuring optimal performance and efficiency.

Honest Estimates and Affordable Rates

We understand that unexpected HVAC repairs can be stressful, both financially and emotionally. That's why we provide upfront, honest estimates and strive to offer competitive rates without compromising on quality.

Expanding Our Reach

Cornerstone HVAC of Thurmont, MD is a growing company with a dedicated team constantly expanding its knowledge and skills. Our commitment to excellence and customer satisfaction has allowed us to thrive in the competitive HVAC industry for over three decades. We value our customers and strive to build lasting relationships based on trust and reliability.

We believe in clear communication and working closely with our clients to understand their individual needs and provide tailored solutions.

Michael Grissom, Founder and Owner

Michael Grissom's passion for HVAC began at a young age, dismantling appliances to understand their inner workings. This early curiosity led him to the Frederick County Votech Heating & Air Conditioning Program, where he honed his skills and knowledge. After graduating, Michael gained valuable experience working for various HVAC companies throughout the region. In 2005, he decided to put his expertise to work for himself, founding Cornerstone Heating & Air Conditioning, Inc. with the vision of providing unparalleled service and reliable solutions to the Frederick County community.

Dave, Lead Sheet Metal Technician

Dave's journey in HVAC began with the meticulous world of ductwork. Starting with renowned companies like General Heating & Cooling, Dave climbed the ranks, mastering the art of sheet metal fabrication and construction. He joined the Cornerstone HVAC team in 2009, bringing his extensive experience and precision craftsmanship to ensure the airtight and efficient installation of ductwork systems. Dave takes pride in his work, consistently delivering high-quality installations that contribute to the optimal performance of every HVAC system we service.