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Great Sky Solar

Featured in Weymouth Today 5.00 (767 reviews)(888) 966-0726

Based in Lexington, Great Sky Solar designs and installs solar systems and heat pumps. For solar projects, its process evaluates roof condition and energy use before developing a custom system design.

Business Highlights
  • Great Sky says its projects are handled by in-house teams, without subcontractors, and include lifetime system support.
  • The company lists a 30-year insurance-backed warranty.
  • Great Sky says its guidance is commission-free and pressure-free.
  • For heat pumps, Great Sky says the system designer works alongside the in-house installation team.

Service Area

Based in Lexington.

Featured on ProsGrade. Great Sky Solar is one of 3 solar companies ProsGrade lists in Weymouth, Massachusetts.

Listing details

4 services listed, including Solar systems, Energy storage and Heat pumps. Open weekdays, closed on weekends. Rated 5.0 from 767 reviews.

  • Verified listing details
  • Service information
  • Customer review signals
  • Photo gallery
  • Public contact information
  • Published local profile

How This Business Compares

How Great Sky Solar compares with the other 2 solar companies on ProsGrade in Weymouth, using public Google ratings and review counts.

  • Ranks in the top half of the 3 Weymouth solar companies on ProsGrade by Google rating and review volume.
  • Rated 5.0 on Google, at or above the 4.9 average of other Weymouth solar companies on ProsGrade.
  • One of 3 Weymouth solar companies on ProsGrade rated 4.7 or higher from at least 10 reviews.

Services Covered

4 services
  • Solar systemsAll-black, Tier 1 panels; high-efficiency inverters.
  • Energy storageFuture-ready batteries.
  • Heat pumpsElectric heating and air conditioning.
  • Whole-home electrificationA single, integrated clean-energy ecosystem.

Reviews

What customers say

Recent reviews commonly praise clear, no-pressure explanations, responsive communication, and professional, well-organized installations. One customer says they were told savings would start at installation, but had to wait for the utility to replace the meter before savings appeared.

Customer Reviews

Frank Rigiero

We had an exceptional experience working with Great Sky Solar from start to finish. The entire process from the initial consultation through installation was smooth, professional, and well organized. The sales team took the time to explain the system, expected production, and all of our options without any pressure. There was no high pressure sales pitch or gimmicks.  Just straightforward information and honest answers. They answered every question we had and made sure we fully understood everything before moving forward. One thing that really stood out was that, between the sales process and installation, they sent an installer to inspect our roof to make sure it was suitable for solar. That gave us real confidence that we didn’t need a roof replacement (it was only a few years old) before installing the system, which we appreciated because it showed they were focused on doing the job right rather than just making a sale. They also handled all of the design work and paperwork from permitting to coordinating with the power company making the entire process incredibly easy for us. The installation crew was equally impressive. They arrived on schedule, were courteous and professional, and completed the work efficiently while keeping everything neat and organized. Communication throughout the entire process was excellent.  We always knew what the next step was and who to contact if we had questions. Overall, it was a great experience and we’re very happy we chose Great Sky Solar.
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Daniel Houdlette

We had our 30 panel install during 2018, choosing Great Sky out of about 6 quotes, primarily based on competitive pricing, good equipment recommendations, and a very transparent and personal upfront design process. Very good people to deal with. From initial down payment in March, things went very smoothly and we were up and running by August 1st. We took all tax breaks in the 1st year and started collecting SRECs in 2019. We received a refund check from Great Sky in 2019, as promised, because actual outputs did not fully meet predicted levels of 10MWh per year. However, the system has been running at 85-95% of that level so far, and would do better with fewer trees. Based on combined returns from rebates, SRECs, and net-metered returns measured from utility bills, the system paid for itself after approximately 5-1/2 years (near the end of 2024). It's been over 6 years of problem free operation and to say we've been satisfied is a serious understatement. We are looking forward to 14 more years of savings, with the idea of adding batteries at some point. I've always recommended going solar to interested parties, and recommended Great Sky to those in their service area. The support relationship has been "Great"
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Sophie Innerfield

We had an excellent experience with Great Sky Solar. They installed our system in August 2025. From start to finish we felt we were in great hands. They were very clear about the design from the start and there were no surprises either in how the system looks, functions, or the cost. Someone was always available to answer any questions I have (and they continue to provide service and support as needed). Their electrician worked with us during the install to make sure all of our conduits were placed to our liking and the final look is great. We are thrilled with our system and highly recommend this company!
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Frequently Asked Questions

Does Great Sky Solar offer a solar generation guarantee?

One customer says Great Sky Solar offered a solar generation guarantee through a third party.