You've come to the right place. Welcome to the Home Page of Tri-State Home Services, American Air Conditioning, and Gilley's Heating & Cooling.
We are Full-Service Heating, Ventilation and Air-Conditioning Contractors serving Residential and Commercial Customers.
Our Companies provide service in Central Maryland, Northern Virginia, Southern Pennsylvania, and the Panhandle of West Virginia.
Get A Tax Break
Earn up to $1,500 in Tax Credits When You Purchase Qualifying Home Comfort Products.
Earn even more on Solar & Geothermal Systems
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Recent News & Events
We are one of the few area Companies to achieve NATE Quality Circle Status, which means that over 80%
of our Technicians are NATE Certified. NATE Certification demonstrates our commitment to a program
of ongoing training and quality service and installation. You can
Click Here to learn more about NATE.
We recently completed the Heating & Cooling System for a home constructed in Middletown MD by Habitat
For Humanity of Frederick County. This represents the 8th complete system provided by Tri-State and
it's Employees for Habitat. You can visit the
Frederick Habitat Web Site to learn more
about Habitat.
Tri-State Home Services recently installed the Heating & Cooling Systems in the Home constructed
for the Jackson Family by Extreme Makeover Home Edition for the show that was shown on September 28th, 2008.
You can read about the event, and see Behind-The-Scenes photos by visiting the
Classic Homes Web Site