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    SumZero Energy Systems

    4.2 (21 reviews)
    Closed 8:00 am - 5:00 pm

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    Services - SumZero Energy Systems

    HVAC installation or replacement

    HVAC system repair

    HVAC system maintenance

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    Thank you very much, it was a pleasure serving you!

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    Ask the Community - SumZero Energy Systems

    Review Highlights - SumZero Energy Systems

    The team led by Paul showed up on time every day and worked extra hours to finish the job in a week.

    Mentioned in 4 reviews

    Read more highlights

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    Chris Lombardo Plumbing & Heating

    Chris Lombardo Plumbing & Heating

    (15 reviews)

    We've had Chris come out to our 1950's era house a few times to help us with our heating here…read morebefore the cold season sets in. The work we had him do involved re-fitting some radiator pipes for a new radiator, installing a Slantfin 30 radiator, removing a cast iron radiator, and capping off some un-used branches from our HW heating system. Chris came, gave us an estimate of the level of effort and worked with us as had some project hiccups and scheduling issues we encountered. I appreciate that the whole time Chris was very honest about how much time parts of the job would take, what his rate was and how he passed on materials costs. I always take it as a good sign when a contractor is very honest and communicative - two things Chris excels at. He showed up on time, ready to work and worked steadily. After he was finished with the radiator install, he fired up the boiler and helped us bleed the air out of the system, taking his time to ensure the boiler filled properly, fired up, and started to heat our home. He also wanted to test the radiator he had installed for us to ensure that most of all, his work was done correctly. I appreciated his attention to detail and willingness to stick around and ensure the job was done correctly. Overall, we found Chris to be an awesome guy, and a reliable and knowledgable plumber. We will be going to him for all of our plumbing needs for years to come.

    Chris solved our issue in just a couple hours and gave us good advice on future maintenance. If we…read morehave another plumbing issue, I will definitely call Chris again!

    Centerline Mechanical - New construction project that will be utilizing mini splits as the primary source of heat.

    Centerline Mechanical

    (7 reviews)

    These guys are awesome and easy to work with. I appreciate that Julian wasn't trying to sell me a…read moreheat pump when all I asked for was a boiler replacement. Price is reasonable and about the same as the other 2 quotes I got. I like how they accept credit card payment if you are trying to maximize credit points. You can also save 2% of you opt to pay in cash. Install went well overall. There were some hiccups but they did come out immediately go address any concerns. Would highly recommend this team if you want to get your boiler replace

    I had an issue with my air conditioner, I looked up Centerline and was very impressed by the…read morebackground of the owners. They are local BVT grads, then went to Mass Maritime before starting their business. I called and someone picked up immediately. I had a very pleasant conversation with the person on the phone. I thought I was going to have to wait a long time for an appointment as it is summer, but he had a gentleman, Adam, out to us the next morning. Adam arrived at 8, on time, professional, called before he arrived. We had asked because we needed to lock up the dogs. Adam looked at our air conditioner and immediately identified the problem, explained it and took care of everything. He wore foot protection and cleaned up everything. The price was very reasonable and Adam recommended cleaning once a year and changing the filters twice a year. I highly recommend this company.

    Nicholson Plumbing, Electrical, Heating, and Air Conditioning - Trust Nichoslon's reliable heating service

    Nicholson Plumbing, Electrical, Heating, and Air Conditioning

    (139 reviews)

    If I could, I'd give 5 stars for repair and 1 star for service…read more Service: Over the years I've tried several times to schedule routine maintenance, and every time the wait is 4+ months -- basically making it impossible to get seasonal maintenance done unless you book a year in advance. After paying for a repair estimate, the technician told me the best solution for my issue was to keep up with routine maintenance. On that basis, I was sold a Comfort360 support plan at $40/month, which states in the contract: "Provider will provide you with priority service in scheduling your maintenance and emergency repair appointments over non-Comfort 360 customers." Nevertheless, Nicholson informed me that the AC maintenance appointment I'd scheduled in April would remain in August and couldn't be pulled in by even a single day. Unless every appointment booked through August is for a Comfort360 customer, they are clearly not giving Comfort360 customers priority. You can verify this yourself by scheduling maintenance on their website -- whether you indicate you're a member or not, you're given the same service dates. If you're going to sell a premium service plan, you ought to carve out dedicated appointment slots for members rather than sharing a common pool between members and non-members. Repair: I've used Nicholson for both plumbing and HVAC repairs and have always found the technicians to be honest and fair when describing my options. This stands in contrast to some providers that try to sell products and services the customer doesn't need.

    Derek and Eilel completed the difficult work of installing a new outside frost-freeze protected…read morefaucet on our historical Sudbury house. Also, Derek identified the cleanout trap for our septic waste water line, as well as executed a disconnection and removal of a failing salt-based water softener - much appreciated! The system is now finally again using the inline carbonate filtering cartridges, which help to extend the life and health of our appliances and drinking water resin filters. Very pleased overall as usual with Nicholson service techs and company.

    SumZero Energy Systems - hvac - Updated May 2026

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