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"DO NOT HIRE FOR HVAC. Cotti Johnson has been the single worst contractor I have ever dealt with to date. If you have a simple HVAC repair, they may be able to do it but it's a gamble. If you have a large HVAC related work to be done, do yourself a favor and hire a company that understands the equipment they're dealing with. Where to start... I hired Cotti-Johnson to replace my old oil boiler with a modern heat pump system as the main source of heat for my house. Thomas Kelly, who was the initial person that came and made recommendations on the replacement system, should not be in the business of recommending heating systems to people. First of all, there's no heat load calculation of any kind, which is the first red flag but I didn't know any better at the time. They simply guess based on the size of the house without knowing a single thing about insulation or any other factor. Second mistake was recommending a single indoor head for an entire first floor that's separated by stairs in the middle of it. My initial concern with this was dismissed by Thomas who simply said "just give it a try!" Unfortunately, we're now stuck in a position where we can not remove the old boiler because the new system simply can not heat our first floor evenly. We have hot side and cold side and unfortunately our dining room is now permanently cold. It has been months of unanswered calls and emails and numerous back and forth to come up with a solution with still no end in sight. They do not return calls. Third mistake was installation. It took weeks to convince Cotti-Johnson and countless ignored calls and emails to get them to fix a mistake they made with the original install. Even then, they had to make multiple trips to finally realize they didn't account for line lengths accurately and undercharged the system. They finally did admit this and properly charged the system. They simply did not know how to deal with the equipment they're installing. I had to ask for proof of exactly how much refrigerant was being added in order for them finally do a proper calculation and add correct amount of refrigerant. Hire a diamond certified contractor if you want a Mitsubishi system and do not want to deal with these kind of amateur mistakes. Even after they finally did charge it to seemingly proper levels, they never installed back the brass screw caps for the outdoor unit or put the cover back on all the way. All around careless and amateur work. To add more insult to injury, I have been trying to get in touch with Cotti-Johnson for over 3 months for correcting inspection results and so far all of my calls and emails have been ignored. Learn from my mistakes and avoid this company at all costs."

"They were excellent workers"

"Amazing work! Fast, efficient, and I would highly recommend them. I will use them again in the future!"

"Following a home inspection I needed some odds and ends electric work done. Add 4-5 GFCI, ground a few plugs, etc. Also there were two knob and tube wires totaling under 20” in length that needed replacing. Items that most handle homeowners can do but I wasn’t allowed to because of the selling process, etc. I also needed it done within 7 days. A guy from Cox Electric came to my house to give me an estimate. (I’ll get back to that…) The guy that DID come to fix (Bill from another company) took 3 hours, did a beautiful job, and charged me $850. What was Cox Electric estimate? $3250. With materials costing under $50, this comes to over $1000/hour. While not against the law, gauging homeowners that are going through the process of selling a home is unethical."

"They were able to send someone to the house within a few days of initial contact. He wasn’t able to troubleshoot the problem directly but he was able to reach out to someone who could and everything was taken care of quickly and efficiently. Would absolutely contact them again in the future!"

"Incredible service from Thomas. He was incredibly professional and fast with his work. I told him I wanted recessed lighting and wires run for a projector I wanted installed. He gave me a full run down of what he planned on doing along with an expected time frame. Thomas got all the work done within just a few hours and at what I feel was a very reasonable price."

"Amazing. Came within an hour of my call. Fixed the problem."

"Jay's firm performed very professional work for me. He and his staff were responsive to my questions and concerns throughout the bidding and selection process, his crew arrived punctually on the agreed-to date, and performed the work in a very competent manner. The work done was neat and clean, done rapidly without problems or delays, and provided a very professional installation, using quality components. The job was done for the agreed on quote - without add-ons, even though some of the parts that I had suggested could be used (to save cost on the quote) were not used, and new parts provided. At the end of the install, the crew hooked up my generator and stepped me through the hook up and transfer process. All-in-all, I would recommend Positive Energy Electric for your electrical service needs, and would call them myself for future work."

"Prompt and professional. Showed up and did the work. Will be using this company again."

"Moises and his team essentially rewired my entire 2400 sqft 1850's home, replacing old wiring, adding new outlets, switches, lights, etc. It was a big job. He was great to work with, very professional and reliable. We checked in on progress and the plans for the day almost every day and he was very flexible when we decided to make changes (which happened multiple times). He worked closely with the town inspector to make sure everything was up to code. We were also living in the same space that needed work and he and his team were good about covering things up and minimizing dust as much as possible. I would hire him again if I ever needed anything new added and highly recommend him for any of your electrical needs."