Kelvin

Overview

Kelvin is a New York-based company headquartered at Brooklyn Navy Yard in Brooklyn [1][5]. Founded in 2013 by Marshall Cox, a PhD student in electrical engineering at Columbia, the company developed its initial product after Cox invented a smart insulated radiator enclosure in response to overheating issues in a dorm room [4]. Kelvin sells the Cozy, a smart radiator cover, and an Adaptive Electrification platform that replaces window air conditioners with smart heat pumps, both designed to work with existing building infrastructure including boilers, controls, radiators, and windows in older multifamily buildings on steam or hot-water systems [3]. The company reported more than 40,000 active Cozys with an average 25.5% savings on heating costs as verified by NYSERDA, and has avoided over 16,000 metric tons of CO2 annually [6]. Kelvin partners with utilities including Exelon, Con Edison, National Grid, Peoples Gas, and PSEG [7], and was named to the 2025 Global Cleantech 100 [8]. The company is listed in MetaProp's portfolio [2].

The company's own website places it in New York: Headquartered at Brooklyn Navy Yard, 63 Flushing Ave, Brooklyn, NY 11205; also states 'Kelvin was born in a New York win. [1]

Kelvin began in 2013 when CEO Marshall Cox, then a PhD student in electrical engineering at Columbia, invented a smart insulated radiator enclosure after his twin complained about an overheated dorm room. [4]

Kelvin listed its address as Brooklyn Navy Yard, 63 Flushing Ave, Building 303, Suite 702, Brooklyn, NY 11205. [5]

Growth & traction

Kelvin reported more than 40,000 active Cozys and an average 25.5% savings on heating costs as verified by NYSERDA, plus 16,000+ metric tons of CO2 avoided annually. [6]

Kelvin earned a spot on the 2025 Global Cleantech 100, announced January 16, 2025. [8]

Partnerships

Kelvin said it is a proud partner with Exelon, Con Edison, National Grid, Peoples Gas and PSEG and is the only incentivized radiator control solution. [7]