Save on new cooling system installation this year

T.F. O'Brien will not only keep your family comfortable. We can also save you money and make your home more efficient.

Heating & AC Repair & Maintenance for Long Island

Do you need Air Conditioning repair? Perhaps you're thinking annual maintenance can keep your system running smoothly and your home or workplace comfortable.

Long Island's choice for commercial HVAC

Businesses and commercial property managers trust T.F. O'Brien for our qualifications, service and quality products.

Ductless heating & cooling could be right for you.

We install hundreds of these systems every year - but many don't even know this option exists.

T.F. O'Brien featured on HouseSmarts

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Solutions You Can Trust

We go above and beyond on every project. It’s our promise to you. Read More >

Emergency Service

When you need help, and you need it fast, you can rely on T. F. O’Brien to be there as soon as possible. Call us when you have an emergency, 27/4 even Holidays or weekends.  Read More >

Seasonal Tune-Ups

The life of your system, and its efficiency, is dramatically impacted by how well it’s maintained. You’ll have a worry-free season, once we’ve given your heating or AC system its tune-up  Read More >

Annual Maintenance

Annual maintenance agreements are an easy and affordable way to keep your system running in tip-top shape, and ensure that if there ever is an emergency, you’ll get the royal treatment at a discounted price. Read More >

New System Special

ductlessNow is the time to save on a new heating and AC system. Contact T.F. O’Brien to learn more about how you can save up to $2,100* on a new system. Read More >


If you’re looking to upgrade your system, but you have to work within a budget, then let T. F. O’Brien help make things a little easier with our financing options. Read More >

10-Year Warranty

When you choose T.F. O’Brien as your heating and air conditioning contractor, you’re also choosing innovative Carrier® products that come with an incredible warranty. Read More >


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