Providing Quality Heating & Air Conditioning on Long Island Since 1934

Do you have an area in your home that does not have access to your heating system? Maybe you’ve noticed some cold spots in your home. Or, you might want to replace an old baseboard heating system.

No matter what your need, ductless heating can work for you – and you can count on the experts at T.F. O’Brien to deliver!

T.F. O'Brien Owner Kerry O'Brien

Save Thousands on A New HVAC System

Save Money and Ensure Top System Performance With Our Energy Saver Plan

Energy Saver Plan Advantages:

  • Save money by extending the life and efficiency of your system
  • Ensure the health, safety, and comfort of your family
  • Get personal service, 24/7 with discounts on repairs
  • Protect your system warranty with included annual maintenance


Ductless AC

Feel the Difference: High Quality HVAC Service With Guaranteed Results

Specializing in heating and air conditioning installation, as well as heating repair & ac repair services for over 85 years, it’s easy to see why we are the trusted HVAC experts in Long Island. Based in New Hyde Park, NY, we are conveniently located to serve Nassau, West Suffolk, and into Brooklyn and Queens. We are proudly a Carrier® Factory Authorized Dealer.

    Contact Us

    • Pay nothing until you are 100% satisfied
    • We design, install and engineer a comfort system that is perfect for your property
    • We tell you what to expect up front, with no surprises
    • We respect you and your property
    • Pay nothing until you are 100% satisfied
    • We design, install and engineer a comfort system that is perfect for your property
    • We tell you what to expect up front, with no surprises
    • We respect you and your property

    Emergency HVAC

    Emergency HVAC Service

    Don’t suffer with a broken HVAC system. 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, 24/7, even Holidays or weekends.

    HVAC Maintenance &

    Annual maintenance and seasonal tune-ups for your heating or air conditioning system are easy ways to keep your system in great shape and help to maintain the warranty. Plus, with a maintenance agreement with us, you’ll receive top-notch service.

    Air Conditioning Systems

    Air Conditioning

    When the Long Island summers become too hot, make sure your AC system is working. Whether it’s AC repair or installation of a new system  we can help keep your Nassau or Suffolk home cool.


    Heating Systems

    When the cold strikes Long Island, you may find it to be time to upgrade your heating system or repair your existing system. Get long-lasting durability and high-efficiency while saving both energy and money on your utility bills.

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    North American Technical Excellence Badge
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    T.F. O'Brien's Angi Super Service Award Badge
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    We go above and beyond on every project. It’s our promise to you. WHY CHOOSE US?

    Ductless Systems

    Ductless systems can provide both heating and cooling in your home or commercial space, without the need for ductwork. These systems are highly efficient, have a sleek design, and are easy to install.

    Heat Pumps

    If you are looking to replace both your heating and cooling systems, heat pumps may be your perfect solution. Our team also provides expert repair and maintenance services.

    Commercial HVAC

    In addition to residential services, we provide commercial services to businesses and organizations. These include Heating Installation & RepairAC Installation & RepairBoilers Installation & RepairMaintenance and more!

    Financing Available

    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.

    12-Year Warranty

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

    T.F. O'Brien is a Great Place to Work!

    At T.F. O’Brien, we work to cultivate a team atmosphere that truly is unique. Where each person is valued and celebrated, not just for the great job they do for us, but for who they are as a person. We offer sign-on bonuses for some positions up to $1,000, competitive wages, benefits packages, advancement opportunities, and more!

    T.F. O'brien's service area map

    We Service Our Long Island, NY Customers for Their Heating and Air Conditioning Needs