Name: T. F O'Brien
Address: 100 Denton Ave, New Hyde Park, New York, 11040
Telephone: 516) 488-1800
Price range: $$$

For over 85 years, T.F. O'Brien has been Long Island's leading ductless AC contractor. Our expert technicians specialize in the installation and maintenance of both residential and commercial ductless mini-split systems. If you're considering the benefits of a ductless air conditioner, you've come to the right place. We're here to help you with all your ductless cooling needs.

The Benefits of Ductless Air Conditioning

Ductless air conditioners provide the cooling comfort of a traditional system to specific spaces in your house, without the need to add additional ductwork. No matter what your plans are for your ductless air conditioner, your contractor will help you choose from a wide variety of ductless systems. It will give you the efficiency, aesthetics, and comfort of a traditional cooling system. This is a quiet alternative to noisy and unsightly window air conditioning units. Learn more about the installation services our professional team of ductless HVAC contractors offer.

Dual Purpose
Heating and Cooling

Up To 40% Less Energy Used
Than Traditional Systems

Save Money
With Lower Energy Bills

Why Work with a Ductless Air Conditioning Contractor?

Specialized Expertise: Our T.F. O'Brien ductless AC contractors have specialized training and experience in installing, fixing, and maintaining ductless systems.
In-Depth Knowledge: We understand the unique requirements and technical details needed for a successful installation that guarantees optimal performance.
Custom System Design: Our ductless mini-split contractors evaluate key factors—including layout, square footage, and insulation—to determine the best system size and configuration.
Guaranteed Results: This tailored approach ensures you achieve maximum comfort and energy efficiency.
Personalized Comfort: Our experienced ductless HVAC contractors leverage years of training to provide comfort solutions personalized for your home.

Get Started with an Estimate

Call T.F. O'Brien Cooling & Heating at (516) 488-1800 or complete our short form below and a representative will reach out to you.

"Completely Satisfied"

"I was completely satisfied with the professionalism, quality, and courteousness of your service. I will continue to call on and recommend you all future AC/Heating needs. Thank You."

- T.F., Baldwin, NY

4.9

1,940 reviews

T.F. O’Brien review scores as of 9/15/25

See how Daikin ductless systems can improve your comfort and save you money

Discover how Daikin ductless mini-split systems revolutionize your home comfort while delivering significant energy savings. Unlike traditional single-speed systems, Daikin ductless inverters feature variable-speed technology for precise temperature control, superior efficiency, and lower monthly HVAC costs.

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Hear the difference in a Daikin ductless system from T.F. O'Brien

T.F. O'Brien brings you the quietest ductless solutions available, engineered to operate consistently under 50 decibels (dB). Enjoy ultimate home comfort and peace in your renovated space with the remarkably low noise level of a Daikin mini-split system.

Ductless Maintenance and Repair Services on Long Island:

Already have a ductless system installed in your home but concerned it may need repairs or replacement? Our ductless services include a full range of repair and maintenance services for your system. We are dedicated to doing what we can to make your home comfortable year-round. When you need a ductless air conditioner contractor on Long Island, T.F. O'Brien is here to help you. By choosing us as your ductless AC specialist, you’ll get efficient, effective, and customized solutions for your home’s cooling needs.

T.F. O'Brien proudly serves all of Long Island, including Nassau County, Suffolk County, and Brooklyn. Simply call 516.488.1800 and we’ll be happy to assist you with:

Ductless Air Conditioner Contractor on Long Island, NY