Renewable Energy Systems, LLC

Renewable Energy Systems, trading as RES Solar, is a Cohasset specialist that has spent well over a decade installing solar hot water systems — plus some PV and solar pool heating — for homes, businesses and non-profits across New England, and Massachusetts permit records back that focus up: 23 permitted jobs from 2012 through 2025, nearly all solar thermal collectors and pre-heat tanks, running from Marshfield to Cambridge to Hingham. The written record on file is thin, but what exists points the same direction: a 2019 account on EnergySage describes a leaking water tank swapped for a new one at exactly the price quoted, with the crew showing up when promised — notable, the reviewer says, in a trade where quotes tend to grow. Its Massachusetts home improvement contractor registration is active, and BuildZoom's profile also lists an earlier registration under a different number that Massachusetts records show was cancelled at one point, ahead of the company's current active one. It also holds a verified Massachusetts Women Business Enterprise certification through February 2027, and carries an A+ Better Business Bureau rating as an 18-year-old company with 6 employees under owner Erica Boyle. For solar hot water, thermal or pool-heating installation specifically, the permit trail and certifications point to a firm that has been doing this work steadily for a long time — just confirm current turnaround and pricing directly given how little recent written feedback is on file.