Contact Reliance Mechanical

Here at Reliance Mechanical Services, we offer state of the art Solutions with the highest quality commercial and residential service. At Reliance Mechanical Services we boast a courteous team of expert professionals with years of acquired industry experience.

Hours of Operation

WEEKDAYS:  7:30am –4:30pm
SATURDAY: 7:30am –4:30pm
SUNDAY: 7:30am –4:30pm

Our Location

24hr Emergency Service 

(631) 787-2600  

Contact Us

Welcome To Reliance Mechanical Services

Long Island’s Full Service HVAC Solution!

At Reliance Mechanical Services, we are proud to consider ourselves Long Island’s most reliable, full service HVAC contractor. We provide free consultations so we can help you design a package that best suits the need of your property and your finances. Allow us the pleasure of securing the comfort for your residential and or commercial needs. Please feel free to contact our helpful team of consultants today. Click on the “Our Team” page to find out more about you’re your trained comfort consultants. We look forward to hearing from you! Reliance Mechanical Service provides HVAC services to Nassau, Suffolk, Long Island and Queens. Call us at 1 (855) RMS-5255 today. If you are having problems with your home heating systems, check out our furnace repair page.

  • Rick B

    I have dealt with many service-oriented firms in my life, and can truly appreciate a quality organization such as yours. I have always had a prompt response from your organization to my service calls and questions.

  • Thomas P

    We deal with dozens of trades on our job site and would rank but RMS is one of the top three trades that are a pleasure to do business with. They possess immeasurable work ethic and consistently display a high degree of integrity and professionalism.

  • South Shore Medical Care & Diagnostics

    Just a note to thank you for your prompt handling of our service call to repair our air conditioner. Also your repair service man Frank G. was not only efficient, but quiet and neat, above and beyond his requirement.

Residential HVAC Service & Installation

Reliance Mechanical Services is a full service NY residential HVAC solution!

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Reliance Mechanical Services has been in the forefront of NY residential HVAC solutions.

Commercial HVAC Service & Installation

Reliance Mechanical Services offers full service NY commercial HVAC solutions!

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We take great pride on our teams expertise as HVAC specialist with years of industry experiences.

Retail & Restaurant Services

Reliance Mechanical Service specializes in major retail & restaurant services.

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At Reliance Mechanical Services we are grateful for the opportunity to provide you high quality service.

Some Of Our Satisfied Customers







Depend on Reliance Mechanical Services 24/7 – No matter how bad the weather gets!

save-money-icon-money_iconFlexible plans to help you save!

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4722914_120x12024/7 Emergency Service and Support.

007575-firey-orange-jelly-icon-arrows-arrow-circle-refreshFull-service HVAC provider.