“LET US
DESIGN YOUR COMFORT”

There's Snowbody Like Design Flow! 

WELCOME TO DESIGN FLOW

With over 30 years of combined experience in heating and cooling systems, Design Flow Heating and Cooling, LLC knows how important it is to have a go-to HVAC company you can trust – and we are that company!

The reliable, professional, and knowledgeable team at Design Flow is committed to customer satisfaction and finding solutions that meet your needs.

Carroll County Times Carroll's Best Honorable Mention 2020. Carroll County Times Carroll's Best Honorable Mention 2021. Carroll County Times Carroll's Best Honorable Mention 2022.Carroll's best winner '23 icon. Neighborhood favorite logo. Neighborhood faves logo.

PROVIDING INTEGRITY, SERVICE, AND EXCELLENCE

“Very organized. Cody was a delight to work with. He did an excellent job and completely cleaned up after himself.”
- Mohammad F.

“Our Oil Furnace was struggling and needed service during these cold days in January. I called and they were out the next day. It wasn't an emergency, so that was fine. Sammy a technician that has been with Design Flow since 2018 came out and spent several hours not only fixing, but doing a full maintenance on our furnace. He explained everything he was doing and we even save money by getting the maintenance package. This is the second time using them. The first was for my mom's condo prior to selling. Everyone is honest and does a great job. I highly recommend Design Flow for any of your HVA Service.”

- Sharon I.

Photo of happy family after AC repair service from Design Flow Heating & Cooling. An Eldersburg, MD, HVAC company.

OUR COMFORT PLAN

Don’t wait until you’re facing an HVAC emergency to work with a professional HVAC technician. Here are a few reasons to rely on us for HVAC maintenance:

Extend the longevity of your system

Avoid breakdowns and the need for costly repairs

Make sure your system is operating efficiently

Waterfurnace geopro master dealer logo.

WaterFurnace GEOPRO Master Dealer

No matter what climate you live in, the temperature throughout the year varies. For some climates that means blazing summers that cool to frigid winters. What many people don’t realize is that the temperature below ground (regardless of climate or season) stays fairly consistent all year. While air temperatures can vary greatly from day to night or winter to summer, the temperature just a few feet below the earth’s surface stays an average 55°–70°F year-round.

KNOWLEDGEABLE HVAC TECHNICIANS
SERVICING MARYLAND

Is My Furnace Overheating?

Just about any electrical appliance has the potential to overheat, and furnaces are no exception. As a homeowner, you need to take precautions to lower the risk of an overheated unit. You should also be wary of the associated symptoms so you know when to take action.

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A Guide of Commonly Asked Questions About Refrigerants in 2025

Our team has the answers for residents of Ellicott, MD, and all the surrounding areas. In this comprehensive guide, we will cover the following:

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Three Reasons to Consider a Geothermal Heat Pump

Geothermal heat pumps have been in use since the 1940s, heating and cooling homes in the Eldersburg area efficiently and thoroughly. They use the constant temperature of the earth for their heat transfer medium instead of the outside air temperature as air-source systems utilize.

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FINANCING AND
REBATES AVAILABLE

At Design Flow Heating & Cooling, we realize everybody’s financial situation is unique. That’s why we offer convenient options for new system installation and repair services. To find out what you qualify for, all you need to do is click the apply now button below.

Happy couple enjoying their home's indoor air quality, thanks to a visit from Design Flow Heating & Cooling.

MAINTAIN A COMFORTABLE ENVIRONMENT

Bryant Heating & Cooling systems' logo.

At Design Flow Heating & Cooling, we embrace the principles that lead to success. As a Bryant dealer, we understand the importance of unwavering dedication to delivering quality products and service. Our commitment to customer satisfaction and our unwavering pursuit of excellence in performance set us apart. Join us and experience the Design Flow Heating & Cooling difference firsthand!

Design Flow Heating & Cooling customers taking family photo with son, after using one of our special HVAC discounts in Eldersburg, MD.

SEE OUR CURRENT
SPECIAL OFFERS

Discover extraordinary value in our special deals! Move quickly to enjoy incredible savings and exclusive rewards.

JOIN OUR TEAM!

Are you looking for an exciting new career opportunity? Become a part of the Design Flow Heating & Cooling team today! We’re currently hiring and are looking for talented, and motivated individuals to join our team.