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    621 Energy

    5.0 (1 review)
    Open 9:00 am - 5:00 pm

    Services - 621 Energy

    Solar system installation

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    Revision Energy - Team photo 2023

    Revision Energy

    (13 reviews)

    Arlington Heights

    I talked to absolutely every one about a solar panel installation. I easily spent months on…read moreresearching the topic, vendors, and installation techniques. Ultimately I settled on on a mechanically mounted system for my flat roof, which was wonderful. Some vendors would not touch a flat roof. Some only installed ballasted systems. Some vendors assumed that they could use a lift to get onto my roof when they actually needed a crane. Some just wanted to overcharge me with the hot new technology, sweeping the nation. After reviewing multiple bids, I settled on Sunbug to install my system. Chris Miller was a no nonsense saleman throughout my whole research phase. He answered all of my questions, and disabused me of any misinformation I may have had. He was polite, but firm, which is exactly what a layman consumer needs when making a large, delayed gratification purchase like a solar system. Once I signed on the dotted line, their team actually moved fairly quickly through the rest of the process. We were able to install my system before the end of the tax year, so some of that delayed gratification is delayed just a little less. I would give a five star review, but there were a few hiccups. Once I signed the dotted line, the team was less responsive than I needed with my subsequent questions. They installed the inverter in my basement without my input, which is a problem when I plan to finish my basement. We quickly fixed that by simply moving it, but we could have avoided that problem altogether by filling me in on the plan first. I chalk that up to some disorganization, and rushing to complete systems before the end of the tax year. Another silly issue is that their electrician upgraded me to a 200A panel, which is wonderful. For some reason though he reinstalled the same 100A main breaker I originally had, which makes no sense. Now I have to pay some one else to upgrade my main breaker. A month later I am actually still waiting for an inspector to check off on their work so that I can turn the system on, but that may be more an issue with the inspector than with Sunbug. In any event, I am mostly pleased with my purchase, and look forward to bathing my roof in sun shine in the coming years.

    I hope your system never needs a warranty service. impossible to get a human on the phone and wait…read moretimes are apparently 10-12 weeks once someone deems it worth it to respond to emails. there goes this year's peak production. you might be better going somewhere else.

    Critical Mass Solar - Pepperell, MA

    Critical Mass Solar

    (3 reviews)

    Critical Mass Solar is a superb business to do business with. I was fortune to find this solar…read morecompany to do an add on of solar panels on my roof. I can say that this solar company is a very efficient company and does a superb job with installing solar panels and cleaning up after the work has been finished. it is my opinion that Critical Solar has some top notch installers. The electrician is a professional when it comes to running electrical wiring for the solar system - he does a nice, neat and clean job that has a very nice appearance when you look up at the solar panels. I highly recommend Critical Mass Solar to anyone that is wanting to install solar panels on your house or add on solar panel to a system that is already on your roof. When it comes to payments - he takes one payment when the job is totally completed and up running like it is supposed to, other words, he asked to be paid in full when the job is completed. I found Critical Mass Solar employees to be very courteous, polite, and very caring about the owners property. This is truly a 10 star company 360 degrees to do business with here in Central Massachusetts. George

    Critical Mass Solar has been wonderful to work with. From the initial planning and applying for…read morefinancing through installation and working with Unitil, they've been there every step of the way, including getting quotes for removal of some trees to maximize production. I can't praise them enough for their great customer service. If you're looking to go solar, call Critical Mass.

    621 Energy - solarinstallation - Updated May 2026

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