Indoor Air Quality Services

Factory-Trained Technicians

Warrantied Labor and Equipment

24-Hour Emergency Services

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Improve Your Property's Indoor Air Quality

When it comes to maintaining a healthy home environment, indoor air quality is crucial. At Great Mills Heating & A/C, Inc we help ensure clean, fresh air is available for your family.


Based in Lexington Park, MD, and serving St. Mary's and Calvert County since 1972, we offer a comprehensive range of services to ensure your indoor air is as pure as possible:

  • Air conditioning filters
  • Furnace filters
  • Air cleaners
  • Air purifiers
  • Ductwork and ventilation repair
  • Ultraviolet system
  • Dryer vent replacement
  • Thermostat repair and installation
  • Programmable thermostats
  • Whole-house humidifiers
  • Affordable seasonal maintenance plans

Contact us today to learn more about our indoor air quality services.


Why You Need Indoor Air Quality Services

Indoor air can contain two to five times more pollutants than outdoor air and impacts your health and comfort. According to the Environmental Protection Agency (EPA), indoor airborne pollutants are a significant concern.


Here’s why you should consider our services:


  • Reduce airborne allergens and pollutants
  • Improve respiratory health
  • Enhance overall comfort
  • Increase energy efficiency
  • Prolong the lifespan of HVAC systems


Reach out to us to improve your indoor air quality today.


Benefits of Choosing Great Mills Heating & A/C

When you choose Great Mills Heating & A/C, you’re opting for quality, reliability, and expertise. Here’s what sets us apart:


  • Since 1972
  • Same-day free estimates on new equipment
  • 24-hour emergency services
  • Maintenance contracts and agreements
  • SMECO rebate program
  • Licensed and insured (License #50494)
  • Same-day or next-day service
  • Manufacturer warranties and extended labor warranty
  • Standard two-year labor warranty on residential equipment
  • Extended warranties available
  • NFIB - National Federation of Independent Business
  • NATE Certified - North American Technician Excellence
  • HVAC master license
  • Factory-trained technicians


Contact us now to experience these benefits for yourself.


Contact Us

Ready to breathe easier? Get in touch with locally and family-owned and -operated Great Mills Heating & A/C today to discuss your indoor air quality.


Our team is here in St. Mary's and Calvert County, MD, to provide you with the best service and solutions to ensure your home’s air is clean and healthy.

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Licensed and Insured Air Quality Services

Get Warrantied Products and Services

(301) 507-4054

(301) 507-4054

2-Year Warranty

Great Mills Heating & A/C, Inc offers a standard two-year labor warranty on residential equipment. Call for details.

(301) 507-4054

(301) 507-4054
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