257

Overview

257 is an artificial intelligence company [1][3] based in New York [1][2]. The company is listed in VCBacked's directory of funded New York startups [1]. As of the available information, 257 operates at the seed funding stage [4].

New York [2]

257 was founded in 2023. [8]

257 is headquartered in New York, New York. [9]

257 builds digital energy twins of U.S. homes and sells three products, 257 Insights for analytics, 257 Audiences for propensity scoring on solar and HVAC, and 257 Engage for lead capture, charging providers only when a sale results. [11]

Funding history

257 raised a 9.2 million dollar seed round led by F2 Venture Capital, announced in March 2025, with angel participation from Mike Fallquist, Jeff Hammerbacher and Gil Golan. [10]

Growth & traction

257 states on its website that more than 200 solar, HVAC, utility and energy supply companies use its platform, that clients see over 25 percent higher engagement, and that acquisition costs drop by 30 percent or more. [12]

CTech reported that in pilot programs some energy providers increased customer acquisition efficiency by 300 percent using 257. [14]

LinkedIn lists 53 people working at 257. [17]

Customers

Haven Energy and Mitsubishi Electric Trane HVAC US are named as 257 customers in the Pink launch coverage, with reported results including a rooftop solar customer acquisition cost cut by one third and a 26 percent increase in community solar sales. [13]