
St. Charles HVAC Services
St. Charles, with its planned neighborhoods like Smallwood Village, offers a blend of urban amenities and suburban tranquility. These developments are designed with sustainability in mind, and energy efficiency is often a top priority for residents. The factory-trained and NATE-certified technicians at Great Mills Heating & Air Conditioning know how to provide HVAC solutions that keep you comfortable and are sustainable for the local environment.
Our family-owned business takes deep pride in the responsiveness of our service and the professionalism of our work. We back up all that we do with a warranty, and offer payment plans and financing to help you manage your budget.
Call (301) 381-2679 or contact us online today to schedule an appointment and get a free estimate.
Comprehensive Service Offerings to Keep Your Home Comfortable
With Maryland’s dynamic seasons and humidity levels, reliable solutions designed to meet these unique challenges are essential. Our team combines technical know-how with a deep understanding of local needs to provide comfort and efficiency.
Heating Services
We provide a full range of heating services, including installation, repair, and maintenance. Whether installing a high-efficiency furnace to maintain consistent warmth or a versatile heat pump for energy-smart heating, our technicians prioritize systems that deliver comfort and efficiency.
Professional maintenance services are key to optimizing your heating system. Regular tune-ups help detect and address issues like airflow disruptions or aging equipment before they lead to breakdowns. Our team’s extensive knowledge means we can recommend systems that align with your home’s specific needs, whether zoned heating for customized comfort or updated solutions for better energy efficiency.
Cooling Solutions
Summer in Maryland can be intense, with high heat and humidity testing the limits of your cooling systems. We offer a comprehensive suite of services to keep your home cool, from new air conditioning installations to routine servicing and repairs. Our technicians are trained to work with a wide array of systems, from energy-efficient central air units to ductless mini-split solutions, enabling your home to feel refreshing.
Humidity is another common summer challenge. A well-maintained cooling system is essential to balancing indoor humidity levels and preventing clammy air. We optimize your air conditioners and heat pumps for dehumidification, helping to eliminate excess moisture while preserving your home’s structural integrity and comfort. Regular servicing also reduces the likelihood of unexpected breakdowns during peak summer months, so you can rely on your system when it matters most.
Indoor Air Quality for Healthier Living
Seasonal weather shifts in Maryland can bring allergens, pollutants, and fluctuating moisture levels into your living space, impacting the air you breathe. Our air quality solutions tackle these challenges head-on with advanced systems designed to improve air circulation and eliminate harmful particles.
Air purifiers and filtration systems help to remove allergens like pollen, pet dander, and dust, creating a healthier environment for those with allergies or sensitivities. For homes dealing with overly dry or moist indoor air, we also offer humidifiers and dehumidifiers that seamlessly integrate into your HVAC system. By calibrating your home’s air quality and addressing specific challenges, we aim to create a fresher, healthier atmosphere year-round.
Experienced St. Charles HVAC Services
Great Mills Heating & Air Conditioning has been here since 1972. We understand how Maryland’s seasons and climate affect your home’s comfort and efficiency. That knowledge shapes every service we deliver, whether installing an energy-efficient heat pump, repairing an air conditioner, or fine-tuning your indoor air quality.
Call (301) 381-2679 today. 24/7 emergency repair service is available, and we strive for same-day scheduling of non-emergencies.

Hear From Our Happy Customers
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“I have used them for my rentals, and referred them for business clients. The customer service on the phone is always helpful, and they go over & above for customers.”Lynda
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“Professional and didn't try to make me feel like more was needed than just a repair. I'm happy to have found an honest company finally!!”Gail
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“We've been doing business with Great Mills HVAC for over 15 years, and their service is always quick, professional, and friendly.”Bill
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“Great Mills HVAC was quick to respond to my emergency call for repair. The problem was quickly discovered and solved on site.”Shirley
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“We have been doing business with Great Mills Heating & A.C. since we built our house in 1997. They are professional, polite, courteous, and reasonably priced.”Ted
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“GM definitely earned a 5-star rating and not just for the last job but for all the many jobs they've done for me in the past 25 years.”Ray
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“Great Mills Heating and Air just installed my hot water heater and installed my HVAC system 4 years ago. I have been impressed with them both times.”Kathryn
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“The service team was fast, professional, and punctual. I needed a quick adjustment within a couple of weeks and they sent a tech out, same-day, without any resistance.”Adam
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“Been using Great Mills Heating and Air for over 25 years. They provide excellent service. Employees are professional, knowledgeable, and friendly.”Barbara
