About Us

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.

As the Plumbing and Heating Expert for PBS series “This Old House / Ask This Old House” franchise since 1979, Richard Trethewey continues to share with the public what he has learned about the latest innovations in the hydronic and HVAC heating and cooling industry and started his company as a way to train the tradesmen and bring energy efficient solutions to the New England market.

Evan Trethewey


Evan became President in January of 2020. He started full time with RST Inc in June, 2009, but has many years experience in the heating industry. Before graduating from Fairfield University with a business degree, he worked summers at a major...


Richard Trethewey

Vice President

Richard is the founder of RST Thermal. 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.

Read More..

Maryellen Hickey

Operations Manager

Maryellen joined RST Inc in September of 2004. As the Operations Manager, she handles the daily operations of the business and is the operational glue that keeps the entire organization running smoothly.


Rich Bialobrzewski

Engineered Products Division Consultant

Rich Bialobrzewski (By-LO-breski) joined RST Inc in January of 2011 with industry leading experience in Indoor Air Quality and will champion the air side and engineered products division.


Mark Toth

RST Representative

Mark started with us in June of 2012 after working for many years at a large HVAC wholesale distributor in New England. Mark is a graduate of U Maine Orono. He worked 5 years as an HVAC tech and fuel driver in Vermont.


Kevin Bergeron

RST Representative

Kevin started full time with RST Thermal  June 2017. He is a recent graduate of the College of Engineering at  the University of Massachusetts-Amherst.  He has worked as a Mechanical Engineering Intern with National Grid and as an AME Extrusion Engineer Intern with Medtronic, of Danvers, MA.  Kevin covers Western Massachusetts and Connecticut for RST Thermal.


Alex Toth

RST Representative

After graduating from Maine Maritime Academy with a degree in Marine Systems Engineering and obtaining his USCG 3rd Engineer’s license , Alex worked for three years as a Cisco Network engineer before entering the HVAC industry in 2019. He currently lives in southwestern Maine with his Wife and Son. In his free time, Alex enjoys spending his time outdoors Hiking, Fishing, Hunting, and camping. Alex will be covering Maine and New Hampshire.

Dylan Beauregard

Inside Sales/Technical Support

Dylan joined RST Thermal in June of 2019 as our Inside Sales/Technical Support specialist.  He will play a fundamental role in providing key support initiatives on behalf of the RST manufacturer partners.


Piper and Hank

Office Mascots

Piper and Hank can be found roaming the hallways of RST Thermal. They are quite the opportunists and won't hesitate to greet you when you come to visit!