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Long Island & Five Boroughs Commercial Mechanical Services

Dedicated HVAC Experts Serving Suffolk & Nassau County

At RMS dba. Reliance Heating and Cooling, we take great pride in the experience and expertise of our commercial HVAC specialists serving Long Island and the tri-state area. With years of industry experience, we can help you make the right choices for your project. As one of our area’s most comprehensive and reliable Mechanical companies, we can help you ensure your employees, customers, and tenants have the heating and cooling services they need all year round. Whether you need repairs for your boiler or furnace during the winter months or are looking to replace your AC system before summer gets underway, we have everything you need!

RMS New Construction

RMS dba Reliance Heating and Cooling has maintained the same Team of trusted professionals for years to design and install your new construction projects from one story storage units to 250 unit condos to Manhattan high rises.

Our team can help you install, repair, or service all aspects of your system, including:

Fast, Accurate Service Your Company Can Rely On

If your company is looking to implement full-scale commercial HVAC services for your company or commercial property, you deserve the best. At RMS dba Reliance Heating and Cooling, our expertise in HVAC systems and services include water heater repairs, furnace installations, air conditioner repairs and more. We can customize Service Contracts to suit your needs.

We have worked with several retail and restaurant establishments in the area, including:

  • GAP
  • T.G.I. Fridays
  • Banana Republic
  • Buffalo Wild Wings Grill & Bar
  • Outback Steakhouse
  • Tocolo Cantina
  • Old Navy

A member of our team can sit down with you for a consultation and put together a maintenance and service agreement package that works for your building’s needs and your company’s budget.

Call Reliance Heating and Cooling Today

When you are trying to run a business, you do not have time to worry about whether or not your comfort system is going to be there when you need it. Our team of commercial heating and AC technicians on Long Island have the experience and professionalism you need to ensure that maintenance is performed regularly and emergencies are addressed with precision and skill.

Schedule your appointment with our Commercial team today at (631) 619-2529 to get started!


  • Fujitsu
  • Ruud
  • Daikin
  • Bosch
  • Bryant
  • Burnham by Boiler Company
  • Mitsubishi Electric
  • Rinnai

Commercial References

  • GKC Industries

    I am writing to let you know how much I appreciate the special service that your people have provided to The Whitestone Manor.

    The Whitestone Manor Condominiums are an exclusive residential community comprised of 49 Luxury Condominiums spaciously designed in one grand complex. Each residence is outfitted with state of the art amenities that not only provide convenience but also beauty and distinction. Select from a fabulous Studio, One & Two Bedroom units built with only the best brand name fixtures. Whitestone Manor Condominiums also boast’s exquisitely manicured gardens with fountain & dramatic multi-level Grand Lobby with Concierge Service. Other amenities include a fully equipped fitness center with adjacent lounge & Billiard room.

    Reliance Heating and Cooling has been providing heating, air conditioning and indoor air quality solutions for GKC Industries and The Whitestone Manor since mid 1990. They have successfully completed projects from Orient Point, the most eastern point of Long Island to Whitestone New York and all points in-between. Their work ethic is impressive to say the least and is evident in the completion of each project they have been awarded.

    Their commitment to their clients is further defined in their ongoing commitment to service after the project has been completed. We are happy to vouch for the integrity and commitment set forth by Reliance Heating and Cooling.

    Gary Constantopes

  • Breslau Engineering

    To whom it may concern.

    Breslau Engineering, P.C. has had the pleasure of working with Reliance Heating and Cooling on various heating and air conditioning projects over the last two years. Reliance Heating and Cooling have shown that that they run a professional organization in the manner in which they approach a project. The performance in which Reliance Heating and Cooling can be summarized is as follows:

    • Reliance Heating and Cooling has the client’s heating and cooling requirements foremost in their mind.
    • Reliance Heating and Cooling is sensitive to first cost amounts of any project that they undertake and will find ways to keep cost under control.
    • The personnel of Reliance Heating and Cooling are expert technicians and their equipment and ductwork installations are neat and clean.
    • Reliance Heating and Cooling is easy to work with and listens to the ideas and concerns of clients, engineers, architects and other trades.

    I would recommend Reliance Heating and Cooling for any commercial and residential HVAC projects.

    Very truly yours,
    Alexander Santino

  • RNC Industries, LLC

    To Whom It May Concern,

    By means if this letter be advised that RNC Industries has been utilizing the professional services of Reliance Heating and Cooling for six years.

    Reliance Heating and Cooling has designed and supervised the installation of heating and cooling systems for both industrial and private properties that are under our ownership. They have assisted in all municipal inspections and their presence has allowed all to pass without incident.

    His innovative knowledge of both heating and cooling systems has afforded us the most cost effective, efficient and long lasting installations possible.

    We look forward to continuing our relationship for future projects.

    Kindly contact the undersigned should you require additional information.

    Very truly yours,

    Joseph Spigonardo
    General Manager
    RNC Industries
    (631) 289-1734

  • National Grid

    Dear Reliance Heating and Cooling,

    I’m writing to express my appreciation for Reliance Heating and Cooling timely response to our recent work request at our National Grid Hicksville facility on December 16, 2010 your crews completed Installation of a new HVAC unit after our unit failed as we entered the heating season. With a large number of personnel reporting out of this facility, immediate restoration of climate control was of a critical nature. The professionalism and expertise of your installers was evident as they completed installation work without delay or any inconvenience to our operations.

    Please pass along my appreciation to your installers for their exceptional and expedient work, as well as to Reliance Heating and Cooling Inc. for their obvious commitment to ensuring world class customer service.

  • Blackman Plumbing Supply

    As Vice President of Blackman Plumbing Supply, I have known Reliance Heating and Cooling for many years. Being the largest distributor of commercial and residential plumbing, heating and air conditioning supplies in New York, we get to know the character of our customers very well. Reliance Heating and Cooling is not only an excellent customer of Blackman; they have an extraordinary reputation in the industry as a contractor. They are known to be forthright and honest, demonstrating integrity and care with their clientele.

    Blackman looks forward to a continued valuable relationship with Reliance Heating and Cooling well into the future.

    Very truly yours,
    Kevin S.

  • South Shore Medical Care & Diagnostics, P.C.

    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 their requirement.

    South Shore Medical Care & Diagnostics, P.C.

  • Spectrum Communities

    We at Spectrum Communities thoroughly enjoy working with Reliance Heating and Cooling. We find them to be thorough and efficient. They are always on time and often finish our jobs ahead of schedule. We found their pricing to be competitive, and their paperwork and invoices are always in order and submitted on time. Their crews are punctual, clean and extremely skilled. Most important, the quality of their work is exemplary.

    We deal with dozens of trades on our job site and would rank but Reliance Heating and Cooling 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.

    Thomas P.
    Project Manager
    Home Owner

    Dear Reliance Heating and Cooling,

    I am writing to let you know how much I appreciate the special service you and your people have provided to me over the past few months. 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. That, coupled with the fact that I was given your cell phone number to use if needed, has made me a satisfied customer.

    The stand-alone heat pump that you installed to heat the area over the garage is really doing the job. The unit was put in on time and was done very neatly. Also the adjustments you made to the bonus room have made a big difference in balancing the heat across the 2nd floor. Your extra efforts in helping to set up the radiant heat system, although not your responsibility, were truly appreciated.

    I don’t often write letters of this type, but felt that I wanted to point out to you how courteous, professional and easy to work with you and your staff have been, and to let you know that I appreciate the extra effort.

    Best regards,
    Rick B.
    Olde Towne Builders

    As a construction company working on the East End of Long Island with both high end residential and commercial projects Olde Towne Builders is demanding and selective of our subcontractors.

    Reliance Heating and Cooling is the only HVAC contractor that we would consider. The work is always completed within the time frame allotted and in a professional manner. The staff is knowledgeable and responsive to the needs of the client. I would highly recommend Reliance Heating and Cooling for any upcoming projects.

    Rich B.

  • RNC Industries, LLC

    I just wanted to drop you a line thanking you for all of your help, expertise and professionalism in assisting us in the design and installation in the heating/cooling system at our location.

    Along with saving us on heating costs during winter months, I was amazed yesterday when I went out to the shop area and in ninety degree temperatures the Big Ass Fan© made the shop feel air conditioned.

    Joseph S.
    RNC Industries, LLC

  • Eastern Suffolk BOCES

    Reliance Heating and Cooling was contracted to design and install a new HVAC system at the Centereach Learning Center. Under their direction, a new package unit for air conditioning with natural gas heating was put in place. Multi-zone controls, digital programmable thermostats and temperature sensors were used. A completely new ductwork for the forced air was fabricated as well.

    The entire project was completed in a professional manner with excellent attention to detail and user satisfaction. The project was completed as planned just before the new school year began. Eastern Suffolk BOCES is very satisfied with the new HVAC installation at the Centereach Learning Center.

    James B.
    Energy Manager

  • North Shore Farmland Corp.

    I have been working closely with Reliance Heating and Cooling for many years. They have been our HVAC contractor on numerous job-sites. They are extremely knowledgeable, respectable to their surroundings and accommodating. Their jobs always come in on time and within budget. They would be a valued contractor and an asset to your company.

    Danny S