New England Weather can be Rough

But with RST, there's no better place to be!

The Allure of Unico Systems

Efficiency, Functionality & Elegance

RenewAire - Energy Recovery Ventilators

The leader in energy efficient ventilation since 1993.

True Comfort Begins with Crete-Heat

Radiant Installation Simplified


Representing a Systems Approach to Heating, Cooling & Hot Water

RST Thermal’s Mission Statement:
RST Thermal provides reliable technical resources and support to help our partners grow and succeed.
Since 1990 we have been leaders in shaping how people heat, cool and ventilate their homes and businesses.



RST Thermal is a Manufacturer's Representative, serving New England, for multiple leading manufacturers whose products offer a systems approach to comfortable heating and cooling. We provide technical and sales support to our wholesale distributor partners and contractors. For homeowners, we provide geographic lists of installing and servicing contractors to help them find the "best fit" for the project to be done.

Over the twenty year history of the company, we have been involved with thousands of successful projects where contractors sold better equipment, consumers saved dramatic amounts of energy, and solutions were offered that provided the highest levels of comfort.


ZoneFirst, previously Zone-A-Trol, is synonymous with hydronic zoning dating back to the 1950′s, inventing the original motorized dampers and...

Charity Auctions

RST Thermal feels it is all of our responsibility to give back to the community. That is why we periodically run charity auctions, so please check back often to see what we have going on!
See More...