Homepage 2018-03-21T02:32:04+00:00



Air Doctor Is Your Full Service HVAC Company

Quality • Integrity • Excellence

Air Doctor, LLC is owned and operated by Scott and Barbara Karr in Boonsboro, Maryland.  The company was formed in 2013 in order to provide five star residential and commercial HVAC services with competitive pricing in all of Frederick County and Washington County, as well as parts of Carroll County, Montgomery County and Howard County.  Scott has 24 years HVAC experience and has held his Master HVAC license for more than ten years.  Strong and trusting long-term relationships, coupled with quality, integrity and excellence in our workmanship clearly sets us apart and is the core of our business and success.




Call today to claim your special discount!


Air Doctor, LLC is proud to offer our customers with several great financing payment options to fit your needs and budget.  From deferred interest promotions to affordable budget minded options, these loans are an easy and convenient way to pay for your HVAC system.  Click an option below to securely apply today!

Option 1

Option 2


Thanks for visiting Air Doctor’s website. Call today or fill out the short form to schedule your FREE estimate or schedule a service call.

We are here for all of your heating and air conditioning needs 24/7 all year long.

**All of our employees are fully background checked and drug screened.

Get Your Free Estimate!

Please solve + 11 = 21

Your info is encrypted and will never be shared or sold.


Air Doctor HVAC New Special Discounts

Call today for our new "Specials" program at 301-799-7200.  We have some new excellent money savings programs that are easy to qualify for.

1 Comment

The Importance Of HVAC System Registration

Selling a house and the ins and outs of registering a new heating and air conditioning unit. Here's the scoop: If you have purchased a new HVAC system, the manufacturer gives you a 5 year automatic warranty on parts: it's included with your purchase. You can register the new system with the manufacturer and get a 10 year parts warranty if it is registered within 60 days of installation. It is free to register your unit with the manufacturer - doesn't cost you a penny! Some of the HVAC companies will take the time to register the unit for you. That is one of the services we provide at Air Doctor, LLC - HVAC Specialists.  Here is where it can get complicated. If you sell the house, that warranty will not convey to the new owners UNLESS they contact the manufacturer within 60 days of purchase/transfer and tell the manufacturer they want to register the unit. It may cost them a little bit of money to do it ($60-$100). Follow me here - If you, the homeowner, registers the unit and get the 10 year parts warranty, then sell the house AND the new homeowners do not register within the [...]