Professional and Friendly: That’s how we do business!

Comprehensive HVAC and Electrical Services in Maryland

About GAC Services

For 50 years, GAC Services has been a family-owned and -operated HVAC and electrical company in Gaithersburg, Maryland.  Since 1970, our company has been providing professional and reliable cooling and heating services. Our guiding principles are our highest priorities and have been the heart of GAC Services and our employees.

Our MISSION: To build long-lasting client relationships by providing professional, honest, reliable, and valuable personalized indoor comfort and energy solutions.
Our Values: People First, Bring More Than You Take, Leadership At All Levels, Whatever It Takes, Win The Day

The GAC Services Difference

“What do our customers want?” That’s the question that’s been driving the way we do business at GAC Services from the very beginning—back when you might have known us as Gaithersburg Air Conditioning & Heating!  Our core focus is to exceed customers’ expectations by providing expert solutions for their cooling, heating, and electric needs.  Our commitment to excellence has earned us numerous awards over the years.


These are just a few reasons why your neighbors love working with GAC Services. It is this commitment to excellence, along with our friendly and honest professionals that have helped us satisfy tens of thousands of customers throughout Maryland over the years. And it is this that we consider the GAC Services difference. We pride ourselves on delivering our promises and we are looking forward to serving you and hopefully making you a customer for life!

Our HVAC Solutions for Maryland Homeowners

When you need a solution for keeping your home in Maryland cool and comfortable, trust the experts at GAC Services. Our factory-trained and nationally certified technicians are armed with the best products and can help you identify the most affordable and energy-efficient way to cool your home.

When you’re ready to experience the GAC Services difference and our award-winning service, contact one of our friendly professionals. We’re looking forward to serving you and hopefully making you a customer for life!

Ready to schedule AC services for your home or office? Contact GAC! Give us a call or contact us online to schedule service.

Air Conditioner Services in Montgomery County, Frederick County & Howard County, MD

Since our doors opened in 1970, we’ve been keeping our Maryland customers cool with air conditioning services in Montgomery and Frederick counties. Whether you’re looking for prompt AC repair or you’re looking for a new, energy-efficient air conditioner, our NATE-certified technicians are experts in all AC makes and models. Our air conditioning services include:

As always, we offer upfront pricing on all of our repairs—providing you with pricing based on the job, not by the hour.

You can also protect your cooling investment by signing up for an AC maintenance plan with GAC. We’ll inspect your unit every year, catching major repairs before they happen and allowing you to extend the life of your equipment.

Our Heat Pump Services

As the cost of energy rises, GAC Services is more determined than ever to find ways to save you money on your energy bills. That’s why when it comes to cooling AND heating your home, we can’t say enough good things about a heat pump system.

Why purchase, install, repair, and maintain two HVAC systems when you can have it all with one convenient, energy-efficient unit? We service:

Heat pumps work by transferring heat—out of your home in the summer and into your home in the winter—rather than by converting energy into heat. For this reason, if you currently heat and cool with electricity, a heat pump can save you as much as 30 to 40%  on your energy bills.

For heat pump service in Maryland with 100% satisfaction guaranteed, give us a call!

Heating Services in the Gaithersburg Area

Maryland winters can be quite harsh, testing the reliability of even the most well-maintained heating systems. When you need a qualified HVAC provider for heating service and repairs, turn to our experts at GAC Services. With more than 50 years of service in the Gaithersburg area, we have the experience and equipment to help with all your heating needs. We service furnaces, heat pumps, hybrid heating systems, and geothermal systems, and our heating services include:

Has your heating system stopped working? Get it fixed fast with our NATE-certified technicians at GAC Services. Give us a call today at 301-926-3253 or contact us online to schedule an appointment.

Electrical Services in Montgomery, Frederick & Howard County

A safe, reliable electrical system is essential to the modern household. Whether you are concerned about an electrical issue, you would like to add a circuit, or you are ready for a service panel upgrade, talk to our licensed electricians at GAC Services. We are here to help with all your most complicated electrical problems, and we offer fast, friendly service throughout Montgomery County, Frederick County, Howard County, and beyond. Our electrical services in the area include:

Are breakers tripping or lights flickering often? Do you need more power? Call 301-926-3253 or contact us online for help from our experienced, professional electricians. We offer upfront pricing on all repairs and a 100% satisfaction guarantee.

We proudly serve the following locations in Maryland:

Montgomery County: Ashton, Barnesville, Beallsville, Bethesda, Boyds, Brinklow, Brookeville, Burtonsville, Cabin John, Chevy Chase, Clarksburg, Damascus, Derwood, Dickerson, Gaithersburg, Garrett Park, Germantown, Glen Echo, Kensington, Laytonsville, Montgomery Village, Olney, Takoma Park, Poolesville, Potomac, Rockville, Silver Spring, Spencerville, Washington Grove

Howard County: Clarksville, Columbia, Cooksville, Dayton, Ellicott City, Fulton, Glenelg, Highland, Woodbine

Frederick County: Adamstown, Braddock Heights, Frederick, Ijamsville, Linganore, Middletown, Monrovia, Mt. Airy, New Market, Urbana

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