Proudly serving the Wilmington, NC area since 1981.

  • Energy Savings Club
  • Financing
  • Employment
  • Geothermal Heat Pumps

What We do



Having the right heating system in your home can make all the difference Read More

Air Quality

It’s a fact-the air inside your home could be up to five times more polluted Read More

Heat Pumps

A heat pump is an efficient way to cool and heat your home
Read More

Air Conditioning

When it comes to keeping your home comfortable through those hot summer Read More

What Our Customers Are Saying

Gay M.

“The staff at O'Brien were extremely knowledgeable, professional, and courteous. They arrived on time, and were always careful with our home and belongings. We had a very old system that needed to be completely replaced, so it was a big job. I obtained four estimates and their estimate was in the middle, but it included every part of the job, from permits, arranging for needed electrical work, and hauling away debris, to completing the forms necessary for the Duke/Progress Energy rebates. Their longevity in Wilmington and reputation assure me that they will be available to service my unit for years to come. We worked with Mr. Herstine and he was always available to answer questions and followed up at the end of the job. I also appreciate O'Brien's support of Life 90.5 Radio. This was an investment in our home and I appreciate a job well done! Thanks!”

Herbert G.

“These guys are pro's. On time, friendly, expert with HVAC systems, cleaned up after themselves, made sure our cats weren't in the way! A superb job!”

Vince G.

“This was easy. Obrien's was the only contractor to measure our home and determine the correct size units to install. This information was calculated and given to us to help determine what to install. They were neat, clean, on time, and provided a schedule to follow for all work involved. The duct work in our upstairs had to be reworked as it did not provide proper airflow. Since all work has been completed the comfort level is much better. We have been informed that if it does not meet our needs corrections will be done.”

Pamela F.

“Excellent. The entire crew were the friendliest of anyone I have used. They will be doing my next system and yearly service.”

Catherine T.

“As a new homeowner I wanted to establish service with a reputable company. I am so thankful I found O’Brien’s. So helpful, and great service techs and office staff.”

Meredith M.

“My experience with this company is that they will do whatever they need to make sure you are taken care of. Mike was courteous and prompt throughout the process. I had to have a new Heat pump installed at a rental property and I can rest easy knowing that the O'Brien team completed the job!!”

Robert S.

"Matthew did a thorough job. He checked both units and made recommendations that helped me prevent a problem. He was very courteous and polite. He was excellent and is the type of employee we always tried to hire.”

Sheila & Mike I.

“We have used O'Brien for over 10 years. They are our go to people for any heating and air problems. Both of the original units to our house have been replaced with Tranes by O'Brien and they have serviced them every year since installation. All of their techs, sales reps, and office staff have always been polite, friendly, and provided us with excellent service. Josh was the rep who came out this year. As always he arrived on time, worked efficiently and was very respectful of our home. Josh represents O'Brien well. Thank you all for your excellent service over the years.”

Barbara B.

“Trace did a good job servicing my unit. He was friendly and was a sport to come in the bad weather!”

Wendy N.

“Mike R. did a great job! He put me at ease with such a large purchase and only gave me options that he knew would suit me and my home. Thank you to all of the O'Brien staff for replacing my 15 year old system. I am so pleased, thrilled and relieved! Wonderful job!”

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