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RST Thermal / Unico / Zone First

372 University Avenue
Westwood, MA 02090
United States

RST Thermal is a Manufacturer’s Representatives in the New England area covering Eastern Massachusetts, New Hampshire, Maine, Connecticut, and Rhode Island 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.

Richard Trethewey is the founder and owner of RST, Inc. He has been in the heating and plumbing industry his whole life. He grew up working at the family’s fourth generation plumbing and heating business which was started in 1902. Richard started RST Inc. in 1989 as a Manufacturer’s Rep firm to pioneer and champion the best quality hydronic heating and cooling products. Starting RST Inc. allowed Richard a platform to educate and bring energy efficient and “systems” solutions to the New England market. RST Inc. has grown because of the strong focus on quality products backed by a commitment to technical support and customer service.

RST Thermal | Thermolec


RST Thermal | Aermec


RST Thermal | LG HVAC


RST Thermal | Soler & Palau

Soler & Palau

RST Thermal | Drake Chillers

Drake Chillers

RST Thermal | Bard


RST Thermal | ZoneFirst


RST Thermal | RenewAire


RST Thermal | Crete-Heat


RST Thermal | Unico System

Unico System