Welcome to Air Doctor Heating and Air "About Us" page. Here you can review our philosophy, read our story, meet your team and meet some of our local networking vendors.

Our uniformed and highly skilled team are fully background checked, certified and are ready to serve all your HVAC needs.

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Air Doctor Google Guaranteed

Air Doctor Heating and Air is proud to announce our acceptance into the Google Guarantee Program. This program has been established by Google to help ensure customers that the merchants they are considering have been fully vetted for licensing, insurance compliance, customer ratings and technicians have been background checked so they meet their high Google standards.

Air Doctor Heating and Air proudly supports our youth. Consider supporting the Oakdale High School Marching Band. What a great job they did on our work van! Thank you to all the hard workers...

Air Doctor Heating and Air Story

Air Doctor, LLC dba Air Doctor Heating and Air is licensed, insured and accredited. Servicing the central Maryland area since 2013 with outstanding Five Star complete residential and commercial HVAC Services including Heating, Heat Pumps, Air Conditioning and Air Quality Control Systems.

The Company is owned and operated by Scott and Barbara Karr. Scott Karr has been working with HVAC systems since 1994 and has held his Master HVAC License for over ten years.

Dedicated to providing you with the best products and services possible. Employing only highly qualified and professional technicians and providing them with ongoing training to keep them abreast of all technology advancements. All our technicians are fully screened and properly tested. You can trust our staff at Air Doctor Heating and Air.

Air Doctor Accredidations

Air Doctor Gift Basket

For all our New System Installations. Our customers receive a special thank you gift from us:

2 Greencastle Coffees, 1 Mountaineer Popcorn, 1 Cedar Ridge Soap Bar, 1 Votive, 2 Pillar Beeswax Candles from Millhouse Candles, 1 Mountain Spice Dipping Blend, 1 Good Juju Jam, 1 Home Depot Gift Card, Assorted Air Doctor Giveaways

Gift Bag
Greencastle Coffee
Mountaineer Popcorn
Cedar Ridge Soaps
Millhouse Candles
Good Juju Jam

Mountaineer Popcorn

REALLY Delicious and wonderful popcorn, so many custom flavors! Click the icon to visit their website.Mountaineer Popcorn

Millhouse Candles

Beautiful, Handrafted candles from a local Artisan! Click the icon to visit their website.Millhouse Candles

Cedar Ridge Soaps

Wonderful, Fresh Scents, Just beautiful and Handcrafted! Click the icon to visit their website.Cedar Rdge Soaps

Good Juju Jams

Delicious Jams and Jellies, Amazing flavors! Click the icon to visit their website.

Our Air Doctor Heating and Air team believes it is important to Barb and Alyssasupport our youth. In doing so we invest in the future for all of us. Alyssa Frans is a brilliant young lady who has been nominated for the National Academy of Physicians and Medical Scientists Award of Excellence. She will be travelling to Boston for this exciting event and Air Doctor Heating and Air is proud to make a donation toward her future.

Alyssa aspires to be a Trauma or General Surgeon following her education. She maintains a 4.0 gpa at Williamsport High School and is a dedicated student. We encourage Alyssa to keep following her dreams and make a difference.

Meet Your Team

Ready to provide you with our Best AIR DOCTOR HEATING AND AIR Service, our staff looks forward to working with you!

Scott Karr

Scott Karr

Founder & Owner

Scott Karr- From Mt. Airy, MD originally and now residing on his farm in Boonsboro, MD. Scott has honed his HVAC skills over the years leading up to when he would realize his dream of providing the best HVAC products and services in the industry. He then founded Air Doctor, LLC dba Air Doctor Heating and Air. Having raised his three daughters, it was the perfect time to open his business in 2013 with his loving wife Barbara to run the office and support the business. After working at several prominent HVAC companies in the Metropolitan area, Scott realized that he wanted to create his premiere company with the focus on customer service, something that other companies were lacking. Master HVAC, NATE, EPA-CFC licensing.

Barb Karr

Barbara Karr


Barbara Karr- Barbara hails from Jamestown, NY and Graduated from Jamestown Senior High School, but has resided in Maryland since 1979. Barbara is a mother of three beautiful daughters and a grandmother of four. Barbara worked in Sales, Marketing and Customer Service throughout a number of varying industries and enjoys networking across many fields. Advantages which she brings to Air Doctor, LLC dba Air Doctor Heating and Air. Barbara earned Top 10 Sales Nationwide with Miles Homes.

Clint Rawlings

Clint Rawlings


Clint Rawlings is a dynamic member of our comfort specialist sales team. Raised in Maryland, he earned his Bachelor of Arts in Communication and Public Relations from St Francis University. He started his first business at age twenty four, Is President of America’s Hauling for Hope, non-profit and has earned numerous customer service awards throughout his sales career.

Clint is married with a son and stepson and lives on a small farmette with their dogs, cat, goats and chickens. He is very engaged with Church and community outreach programs.

A great communicator, Clint is dedicated to providing you with outstanding service start to finish.


Alex Hickman

Alex Hickman


Alex Hickman is from Frederick and graduated from Linganore High School. Currently Alex is wrapping up his Bachelors degree in Communication Arts from Salisbury University.

He is a proven leader and earned the most improved chapter in 2016 when he was the pledge educator. He also organized 'Homers for Heroes' which was an event that raised money for wounded veterans. He has an award from Hootsuite for his social media knowledge and he is very excited to begin his sales career with us.

A pledge educator with Hootsuite and contributing to the most improved chapter means Alex is well versed in Networking and social media.

Alex enjoys outdoor activities including fishing, golf, hiking, etc. We are pleased to have him join our sales team and he greatly looks forward to assisting our customers with assessing their HVAC options.

Marcus Wengert

Marcus Wengert

Journeyman Mechanic

Marcus Wengert- Marcus was raised in Glen Burnie, MD and found that he had quite a talent for mechanical work. He soon found his niche in the HVAC industry and has over fifteen years as a certified journeyman technician and joined Air Doctor Heating and Air just this year. Marcus is a great asset to our team! EPA CFA License.

Tony McDonald

Tony McDonald

Mechanic/ Technician

Tony McDonald- From Martinsburg, WV, T.J. is our indispensable Lead Tech at Air Doctor Heating and Air. Graduating from Jefferson High School, he was SGA President at Valley College, where he graduated top of his class. EPA, 410A, OSHA Certified.

Kris Frans

Kris Frans

Office Staff

Kris Frans- Kris is from Hagerstown, MD where she lives with her husband and three children. She graduated from North Marin High School and has been employed in the Food Service, Customer Care Industry and in Logistics. A dynamic go-getter with a talent to get things done, she handles much of the work in the office.

Vence Royal


Laurel Webb


Laurel was raised in California, but is now from Frederick, MD. She is an artist with a background in a variety of media. Having worked in a number of fields including retail and construction management she is here to help Air Doctor with the website and marketing endeavors.


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