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Solar Installer GuildUnited States · independent

Great Sky Solar

Solar energy company · Lexington, MA

What the listing shows you

5.0★

776 Google reviews

What it doesn’t

under 1%

rated 1–2★

typical in the Boston area, 2%

Newest review held

Aug 2026

newest held review this month

Google's rating breakdown · all 776 reviews

Rated 1–2★
under 1%
typical in the Boston area, 2%
Posted an update
5 days ago
the company posting to its own Google profile
Replies to reviewers
3%
of the 400 reviews we hold

Its one and two star share is 1 point below the typical installer in the Boston area. Across Massachusetts, 106 of the 198 installers whose breakdown Google has published carry a higher share than this one.

The percentages are Google’s own arithmetic over every review it holds, not a sample we assembled. Separately we hold 400 review texts for this company, quoted below. Google publishes review ages rather than dates, so every date here is approximate.

On the Massachusetts ranking

The strongest review record in Massachusetts →

Ordered by the share of one and two star reviews, weighted by how many reviews stand behind it. It ranks review records, not workmanship.

Every company we hold in the Boston area, on one axis

0% rated 1–2★15%

Each mark is one company we hold in the Boston area whose Google breakdown has been read, placed by its share of one and two star reviews. Great Sky Solar is the red one. The amber line is the middle of that set, which includes suppliers and maintenance businesses as well as installers.

What reviewers said

  • 1★ · around August 2023 · the company replied

    The gray sky solar transit connect van traveling southbound on 495 (around exit 59 at 9:15AM on 7/28/23) was driving quite recklessly behind me. Apparently 75 in a 65 zone is not fast enough for them while I am trying to pass other vehicles, so they were tailgating me, only a couple feet behind my vehicles and looked to be aggressively verbally upset signaling me to move over. I am in the process of considering solar panels for my home. I have quotes from two other solar installers, summit solar and Revision energy. I assure you I won’t be asking great sky for a quote because apparently they’r

  • 1★ · around August 2023

    Nothing but problems, had to fix several times & once warranty ran out so did the service! Now they don't even return phone calls! Get solar somewhere else! Service is horrible & they lie about problems! They told me it would cost $8,000 to repair! I finally found a reputable solar company & they fixed my system for $500. It was under warranty with Great Sky! Please beware this company is deplorable !

  • 1★ · around August 2022

    I'm 7o years old and this is the first time I've been "Ghosted". I was working with Great Sky for weeks. Things were moving along quite well. Last I heard from my contact person was that a permit would be submitted and he would get me a final estimate. Did not hear anything. Called him back (maybe a dozen times). Called the main office (3-4 times). Was assured SOMEONE would get back to me. Have not heard a thing. Have moved on with another company. I would NOT do business with this company if I were you.

  • 3★ · around August 2023

    This is an competent company from a technical/installation standpoint- they provided me with careful analytics when planning the solar project at my home, and showed up when promised to install the system. But in terms of maintenance and repair, they are unresponsive and irresponsible. When my solar system stopped working for some unknown reason, they failed to respond effectively to my requests (made by phone and email) to schedule a repair or even to troubleshoot the problem. When I finally received a response, they promised to show up and failed to do so. The company is very good at doing a

  • 5★ · around August 2026

    I installed solar at my Newton home about 2 years ago. I talked with a number of other vendors and found most of them very sales-y and not particularly knowledgable about or believers in renewable energy. I was really impressed after my first contact with Great Sky. I never felt like I was being "pitched," but rather having a conversation about how/if solar would work for my home. While Great Sky's price was at the high end of the range, it was a no-brainer for me to choose them. I liked that they were local, had a regular team instead of using contractors like many of the others, and really s

  • 5★ · around August 2026

    Great Sky was responsive and friendly to work with. Installation went smoothly and our system is working well 3 years later.

  • 5★ · around August 2026

    Highly recommend Great Solar. They are just fantastic. The immediate feedback on energy consumption/export reinforces that this such a good thing for the planet. Just do it with Great Solar.

Reviewer names are not published here. Negative reviews are shown first because they are the ones a listing hides, not because they are more representative.

What reviewers keep mentioning

  • solar panel installation 226
  • quick installation 67
  • installation crew 56
  • smooth process 46
  • responsive team 44
  • system reliability 32
  • inverter replacement 30
  • competitive pricing 27
  • electric bill savings 22
  • net metering 11

Topics Google derives from the review text, with how often each appears. A frequent topic is not a good one: “price” turns up in praise and in complaints alike.

What the company says about itself

Taken from its own website. We have not checked any of it, and a sentence on a website is not evidence.

  • Warranty

    “4,500–6,000 30-year insurance backed warranty 30-year insurance backed warranty…”

  • Established

    “been installing Solar for Great Sky since 2021. Before that I was a lighting…”

  • Years in business

    “Works better than solar! I have over 5 years in the construction industry and I’m…”

Elsewhere

  • It is also reviewed on Yelp. Worth reading before you sign anything: those are a different crowd, and the complaints that reach the Better Business Bureau rarely reach Google.
  • It posts on LinkedIn and Facebook. A page that stopped posting years ago tells you something a listing will not.

When they say they are open

Sunday
Closed
Monday
8 AM to 6 PM
Tuesday
8 AM to 6 PM
Wednesday
8 AM to 6 PM
Thursday
8 AM to 6 PM
Friday
8 AM to 6 PM
Saturday
Closed

As Google published them when we last read the listing, not a live check. Ring before you drive anywhere.

Who Google shows alongside them

Google’s own “people also viewed” set, in Google’s order. It is Google’s comparison, not ours.

Other installers around Boston

1–2★3★4★5★gauge 0–20%typical here, 2%

Ordered by how much we can tell you about each, which is not an order of quality. We do not know which of these is better and would not say if we did.

What we don't know

  • The date above is the newest review we hold, which is not necessarily the newest that exists — we hold a large share of Google's reviews, not all of them.
  • We do not verify licences, insurance or bonding. Nothing here has been checked against a state licensing board.
  • We cannot tell you what an installation costs, and we hold nothing about the equipment they fit.

Something wrong here? Tell us and a person will read it.

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