Trusted by Long Island, NY Since 1934

There’s certainly something to be said for choosing a Long Island heating & cooling company that’s been in business for as long as we have. Our over 90 years of experience have not only allowed us to perfect the technical art of HVAC — we’re also really good business people. We know how to keep customers.

Photo of T.F. O'Brien team holding socks.

NATE Certified Technicians

In fact, T.F. O’Brien’s ultimate goal is to provide the absolute best customer service in Long Island. We accomplish this by employing superior craftsmen with great attitudes and work ethic. Our people are passionate about sharing their technical expertise to make every day more comfortable in our customers’ homes and businesses. It’s what makes us tick.

T.F. O’Brien doesn’t just choose the best service people. We provide the training necessary to ensure you get perfect service — and you’ll notice the difference when they arrive at your home or business. Our entire company strives to make sure you enjoy working with us and never have to deal with a hassle. On the rare occasion when we might make a mistake, we’ll do everything we can to fix it and leave you more than satisfied.

Feel The Difference: We Deliver High Quality HVAC Services That Focuses on Details and Respect

Compare this T.F. O’Brien guarantee with the fine print you might see regarding the service of other HVAC companies. Most can only promise that your system will work afterward, and don’t commit themselves to standards of service and behavior in your home or business or your satisfaction with the process.

We will design, install and engineer the perfect comfort system for your property.
We will tell you what to expect up front. Be it costs, service, repairs, installations, system details and limitations — there will be no surprises.
We will respect you and your property.

We create maximum comfort in all spaces whether residential or commercial.

We service all industries, including:

• Medical Offices
• Houses of Worship
• Retail Spaces
• Restaurants
• Banks
• Schools
• Industrial Buildings
• Funeral Parlors
. . . & More

We’re not comfortable until you are.

If you are not 100% happy with our service you will not pay until you are. This guarantee is why more and more customers are choosing T.F. O’Brien and why our business continues to grow. Give us a call the next time you need service. We look forward to pleasantly surprising you.

One of the most important reasons to choose T.F. O’Brien & Co. is our people. Our technicians are extremely skilled, knowledgeable and highly trained — but we get even more compliments on their attitudes, workmanship and respect for our customers.

Affiliations / Awards

T.F. O'Brien's Angi Super Service Award Badge

Angi Super Service Provider

At T. F. O’Brien we go above and beyond on every project, and we think our customers notice a difference. We’re proud to receive awards and accolades, but nothing makes us more proud than the nice things our customers say about us. Our customers were so satisfied, their ratings and references qualified us for an Angie’s List Super Service Award, an honor enjoyed by less than 5% of the service providers rated on the site!

better business bureaua logo

A+ Rated and Better Business Bureau Accredited

T.F. O’Brien has been accredited by The Better Business Bureau since 2014, and we are pleased to have an A+ rating with 4.9/5 review scores overall. T.F. O'Brien's expertise, continuous improvement of home performance skills, excellent customer service, and commitment to the energy efficiency and safety of all homes have earned this accreditation.

3x Carrier President's Award Winner

This award is Carrier's® highest award for dealers and is presented based on expertise, high customer satisfaction, exceptional leadership and management, business growth, and operational excellence. T.F. O'Brien is committed to creating safe, healthy, and energy-efficient indoor environments.

NATE Certified Technicians

Our technicians have successfully completed a series of HVAC, electrical, airflow, installation and service exams, which ensures our customers have highly qualified technicians in their homes. They care for your home and complete the job with speed and precision. All technicians remove shoes on carpets and clean up when they are finished and take personal responsibility for your satisfaction. They are drug-free and will never swear or smoke in your home.

Memberships / Charity Involvement

Town of Huntington Chamber of Commerce Member
New Hyde Park Chamber of Commerce Member
The Townwide Fund of Huntington Corporate Sponsor
Master Plumbers Council of the City of New York Member

Memberships / Charity Involvement

Manufacturer Certifications

Town of Huntington Chamber of Commerce Member
New Hyde Park Chamber of Commerce Member
The Townwide Fund of Huntington Corporate Sponsor
Master Plumbers Council of the City of New York Member

Daikin Elite Contractor
Fujitsu Elite Contractor
Mitsubishi Diamond Contractor
Generac Air-Cooled Generator Certified

Manufacturer Certifications

Daikin Elite Contractor
Fujitsu Elite Contractor
Mitsubishi Diamond Contractor
Generac Air-Cooled Generator Certified

Other Licenses and Certifications

Licensed HVAC Home Improvement Contractors

As licensed home improvement contractors, we are committed to professionalism, technical expertise, and adherence to industry standards and regulations.

ACCA Certified

Through our Air Conditioning Contractors of America Certification, our technicians are kept up-to-date through online learning and resources, training, and networking.

EPA Certified

Our technicians are knowledgeable about the laws and regulations surrounding the use and handling of ozone-depleting substances.

Professional Engineers

We are professionals ready to help you select the best equipment, and install and service your systems with care.

Licensed Master Plumbers

We proudly meet the Gas Operator Qualification (Covered Task 86 and 87) as licensed master plumbers.

A brief history of

T.F. O'Brien

Founded by Thomas Francis O’Brien in 1934, T.F. O’Brien’s initial focus was on commercial refrigeration repair. Over the years we’ve evolved to become a full-service HVAC dealer, offering cooling, heating and more for commercial and residential properties. Review the timeline below to see how we’ve grown over the years.