Great Sky Solar
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.
4 services listed, including Solar systems, Energy storage and Heat pumps. Open weekdays, closed on weekends. Rated 5.0 from 767 reviews.
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- 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
Daniel Houdlette
Sophie Innerfield
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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.








