Founded in 2016, Markool Heating & Cooling is the name to trust when it comes to heating and air conditioning in Frederick, MD, and the surrounding areas. From our professional team and great Carrier products to free estimates and competitive pricing, we design our full suite of services to earn your complete satisfaction. We have extensive experience with a wide range of both residential and commercial heating, air conditioning, air quality, and plumbing services. If you're interested in maintaining or improving the comfort and efficiency you enjoy indoors, we're the right team for the job. Contact us today to schedule your next HVAC or Plumbing appointment!
Customers consistently praised the friendly, professional, and responsive service from both office staff and technicians.
Timeliness
Technicians were frequently noted for being punctual and arriving within scheduled time frames.
Expertise
Many reviews highlighted the technicians' knowledge and ability to diagnose and resolve issues efficiently.
Communication
Customers appreciated clear communication regarding service details, options, and pricing throughout the process.
Quality of Work
The quality of repairs and installations was frequently commended, with many customers expressing satisfaction with the results.
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Beth Cobleigh
Nov 17, 2025
4.0
Changing my review to reflect review of the technician that came out today. The repair is complicated due to the age of our heating system & he needs to get more information. He seems to want to help find a solution to fixing our leaking radiant heat! I hope to change this review to 5 stars if we can have Markool fix the problems! I did get a call back finally. Will update review after service call on Friday. Not sure what's going on with Markool. Called 1 1/2 weeks ago to ask about servicing a leak in our radiant heat valves- I had previously emailed pictures of the valves to ask if this was something they could fix & company still had pictures. Said they would check with master plumber and call me back. No call back. Called again and was told again would ask master plumber if he could fix and call me back. No call back. We used them last year to fix another leak and was very happy with master plumber --he's since left the company.
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Tina Adkins
Nov 14, 2025
4.0
Service work was great. Only offering one thermostat option is ridiculous. Not everyone wants high tech things in their house. Service tech insisted that was the only thermostat they offered and to go to Lowe’s and buy one would be a waste of money. Now I have a thermostat in my house that cost way more then I wanted to pay just because I wanted everything done with the same company.
LP
Louna Parrish
Nov 6, 2025
5.0
Every step of the way we knew what was going to happen. The Team all worked h together too answer all my questions and concerns. I love the new quieter system it is also efficient. The interactions between the front office all the way too the top was top class. The work was neatly and cleanly done. I appreciate the professionalism and care, it is rare to get this kind of trustworthy and truthful efficiency today. Thanks-a-million Markool for being a company that we can highly recommend. Greeting from Myersville MD.
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Giovanny Hernandez
Oct 27, 2025
5.0
Great customer service experience!
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Susan Tucker
Oct 17, 2025
5.0
I was very happy with the service I received from Markool. They have outstanding employees. I called them to get a second estimate. Skyler, who works in the office, was so helpful, kind, and responsive throughout the entire process. Jorge, the technician, was very knowledgeable and thorough. This is an honest company and I highly recommend them.
Frequently Asked Questions About Markool Heating Cooling Plumbing
What services does Markool Heating Cooling Plumbing offer?
Markool Heating Cooling Plumbing provides residential and commercial heating, air conditioning, air quality, and plumbing services including HVAC and water heater services.
Where is Markool Heating Cooling Plumbing located?
Markool Heating Cooling Plumbing is located at 5304C Kings Ct, Suite C, Frederick, MD 21703, USA.
What are the business hours of Markool Heating Cooling Plumbing?
They are open 24 hours a day, 7 days a week.
How can I contact Markool Heating Cooling Plumbing?
You can call them at +1 301-732-4244 or email team@markoolhvac.com.
Does Markool Heating Cooling Plumbing offer online estimates?
Yes, they offer online estimates for their services.
What payment methods does Markool Heating Cooling Plumbing accept?
They accept American Express, Cash, Check, Discover, Financing, Invoice, MasterCard, and Visa.
Is Markool Heating Cooling Plumbing accessible for people with disabilities?
Yes, they have wheelchair accessible entrances, seating, and restrooms, and are a transgender safe space.
Which postal codes does Markool Heating Cooling Plumbing serve?
They serve the following postal codes: 21702, 21703, 21704, 21701, 21710, 21714, 21716, 21717, 21718, 21719, and 21727.
What nearby places can help customers find Markool Heating Cooling Plumbing?
Nearby places include Roche Landscaping Services, Roche Bros., Inc., and Benchmark Building Enclosure which are close contractors and home improvement providers, helping locate Markool Heating Cooling Plumbing easily in the Frederick area.
Are there recreational or fitness facilities near Markool Heating Cooling Plumbing?
Yes, nearby recreational facilities include Tuscarora Tennis Barn and Tuscarora Tennis Club, as well as GROG CrossFit, where customers can enjoy sports and fitness activities before or after visiting.
What local automotive services are available near Markool Heating Cooling Plumbing?
Nearby automotive-related services include Maryland Performance Center, Karcepts, Rayo's Auto Services, R & R Garage, and car dealers like RKT56 and Total Mobility Services, offering repairs, parts, and sales.