Pay Nothing Until You Are 100% Satisfied With Our Air Conditioning Services


See why we are the trusted HVAC experts on Long Island.

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    Google Star Rating 4.6
    385 reviews
    facebook review score five out of five stars
    25 reviews

    Review scores last updated 4/8/21

    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


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    About T.F. O’Brien

    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.

    • 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 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 & Tune-Ups

    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.

    Conditioning Systems

    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.


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

    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 Daikin products that come with an incredible warranty.

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

    Proud to Provide Heating & Air
    Conditioning for Long Island Since 1934