Specials

$50 OFF New Customer Special
With every AC repair for you home HVAC system
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$100 Duct Leakage Test and Report
Ensure your home HVAC system is running efficiently and without leaks. Book an HVAC maintenance and receive a $100 duct leakage test and report for free.
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$200 OFF New HVAC System Purchase
Install a new AC and heating system and receive $200 off your installation.
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Free Second Opinion For repairs and system replacement.
Considering a new HVAC system, and not sure which option is best? Need a major repair, but need to compare prices? Take advantage of our free second opinion offer.
Valid Jan 1, 2026 - Mar 31, 2026
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Contact Us Today

At Great Mills Heating & Air Conditioning, we're always ready to take your call! Give us a call at (301) 381-2679 or fill out the form below to contact one of our team members.

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Same-Day Service Available
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Offering 100% Free Quotes
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24/7 HVAC Service
Don't stress about weekday bookings or office hours. We're available on weekends and offer emergency services.
Licensed & Insured
Entrust your HVAC needs to licensed, insured professionals.
Available for Emergency Help
Get the immediate help you need, whenever you need it.