We’re Your Source for Comfort & Your Ductless Expert

Do you have a new addition or newly converted area in your home that does not have access to your heating system? Maybe you’ve noticed some cold spots in your home and would like to balance out your current heating. 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!

tfo review scores

T.F. O'Brien review scores as of 9/10/22


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.

better business bureau accredited

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