Since 1934.

Specialists in maintenance service and replacement Heating Ventilating and Air Conditioning Systems (HVAC) service, 365 days per year.


T.F. O’Brien & Co provides only the best maintenance and repair service for residential and commercial customers in Nassau and Suffolk Counties. We guarantee you’ll be satisfied with our work as we take great pride in our qualifications.

Our Services

Plus (although we love seeing you and all our customers) we can help you to avoid calling us with an emergency situation. Check out the many benefits of a T.F. O’Brien annual maintenance contract.

Call T.F. O’Brien at 516.488.1800 to learn more about service and annual maintenance. Don’t feel like chatting? You can get a quote via internet right now. Or, if you have a specific question, you can ask a tech right now.


T. F. O’Brien & Co. sells and installs the industry’s best equipment. No two customers are alike. We work with you to understand you unique needs. We can present your options and make recommendations best suited to your situation.


T. F. O’Brien & Co. can assure your comfort whatever your needs. Benefit from our experience with design and integration to achieve fuel efficiency and savings.

Please fill out this form and one of our representatives will contact you within 1 business day.

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