O'Brien HVAC Service
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O'Brien HVAC Service
Someone will get back to you promptly, if this is an urgent matter please call 410-449-3030. Our goal is to be a trusted leader in providing high quality HVAC/R Service and Installation. We value every customer and strive to provide the highest quality of service and to help provide a greater understanding of their heating and air conditioning system.

We aim to accomplish this mission by ensuring attention to detail, timely repairs and doing the job right the first time. We had several quotes to replace our HVAC system, hands down the best price and awesome, quick installation in the middle of a heat wave. Customer for life! I placed an emergency heating call, and O'Brien HVAC was quick to respond and resolved our heating problem.

THANK YOU! I am now a PMA customer. O'Brien HVAC is proud to announce the launch of our newly designed, fully responsive website. O'Brien HVAC has over 25 years of experience servicing people just like you. We offer unequaled service, respect and the correct products priced right.
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Bill O'Brien, principal and founder of O'Brien HVAC Services has been a business owner for over 16 years. A United States Navy Veteran, father of 4 young men with over 25 years of experience in many facets of the HVAC/R trade. He highly values every customer both residential and commercial. Bill has a Masters License in the HVAC/R trade in the state of Maryland and the District of Columbia.
O'Brien HVAC Services is a leading provider of quality HVAC service repair and maintenance for your home. After all, we know that there is nothing more important to you than keeping your family comfortable and your home in the best shape possible. As such, we know how important it is to trust your residential HVAC system service to the best in the business.
At O'Brien HVAC Services we understand that an Air Conditioning, Heating or Refrigeration system that is malfunctioning or broken can wreak havoc and impact your ability to conduct business effectively and potentially impact your bottom line! We pride ourselves in the fact that within hours of your phone call, O'Brien HVAC Services can be on site to diagnose and provide the best solution to resolve your HVAC/R problem.
O'Brien HVAC is proud to announce the launch of our newly designed, fully responsive website. O'Brien HVAC has over 25 years of experience servicing people just like you. We offer unequaled service, respect and the correct products priced right. Our new website only. If you are dealing with a problem with your residential HVAC system or you are ready for an upgrade to your outdated or inefficient system, contact us for assistance today.
Reviews (10)
Ji C.
Ji C.
Sep 14, 2021
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Scheduled an appointment for HVAC maintenance, so I blocked off my work schedule. No call, no show. I called later in the day and was told there were other emergency AC repairs, which took priority. That's understandable, although some sort of notice would've been nice. I reschedule for another day in the following week and book off my work schedule again. Another no call no show. Didn't try scheduling a third appointment, still never received any email or call back about why that second one was missed again.
Sean Heelen
Sean Heelen
Aug 30, 2021
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Our AC stopped putting out cold air last night after a storm, however the circuit breaker was ok. I called and spoke with Bill this morning. We had a great conversation and he was able to make it out to my place within a few hours on a very busy day for all HVAC companies I would imagine.
Once Bill arrived, he checked the outdoor and indoor units and found that the refrigerant was rather low. Now that it has been topped off and running for a while, the internal temperature is much better. What a relief on a day with a heat index above 105 degrees.
To be clear, Bill’s prices are great, but not
SweetTreatsbyRenee
SweetTreatsbyRenee
Aug 14, 2021
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The quality we received today was outstanding. Our technician (Bill) arrived quickly, diagnosed the problem and made the repair in no time. On top of the excellent customer service, Bill shared a few maintenance tips that should serve us well in the future. I would recommend O’Brien HVAC services for all your AC/HVAC needs…and ask for Bill!
Valerie Hammond
Valerie Hammond
Aug 05, 2021
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Positive: Professionalism, Quality, Responsiveness, Value
My AC stopped on a day with 104 heat index. O'Brien's came out the next day. The service was professional. Everything was explained to me and I will use this company again
Service: Repair AC
Alexis Flanagan
Alexis Flanagan
Jun 30, 2021
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Was having cooling issues on a HOT day, called a company early morning who was a no call no show 😩. Called O’Brien HVAC after 5pm and Bill was so nice and accommodating, he came the same day within less then 2hrs. He diagnosed the issue, explained what was going on, and fixed it at a reasonable cost. Will definitely recommend and use in the future! Thank you!!!
Rachel Titcomb
Rachel Titcomb
Jun 18, 2021
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Positive: Professionalism, Responsiveness
Highly recommend O’Brien HVAC! They were professional, courteous and did a great job fixing my AC.
Service: Repair AC
Sharon Morell
Sharon Morell
Oct 10, 2020
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I have used O’Brien HVAC for two years for maintenance of my unit. Bill is a top notch guy - professional, courteous, and honest. He takes great pride in his work and his company, and his transparency supports that. I would not hesitate to highly recommend him!
Linda Dispenza
Linda Dispenza
Sep 12, 2020
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Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
Great service and quick response time! Bill does great work. He's very conscientious, thorough and patient with all my questions. He makes a point to get out to your house as soon as possible when there is an issue. Honestly, I can't say enough good things about the company. Glad someone recommended him to us.
Services: Repair ducts & vents, Repair heating system, HVAC maintenance, Repair HVAC, AC maintenance, Repair AC
Steven Furstenberg
Steven Furstenberg
Aug 20, 2020
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Positive: Professionalism, Quality, Responsiveness, Value
Great service and quick response time! Bill does great work! Bill was very quick to find the issue and correct it. He came out on a last minute call and made sure me and my family had heat restored before a chilly weekend. Highly recommended!
Service: HVAC maintenance
Jason Whetstone
Jason Whetstone
Jul 29, 2020
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Positive: Professionalism, Punctuality, Quality, Responsiveness
Brand new new construction house had AC go out. Came out right away and new immediately what the fix was. Highly professional. AC runs perfect now. Can't thank enough. Highly recommend!
Services: HVAC maintenance, AC maintenance