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"He was very efficient and returned my calls and he did the work and did extra and tidied up after. He was very neat and after doing the work he took me through the steps and showed me all that he did and all that I needed to know. I was very pleased."

"5 stars. Highly recommend"

"Diamantopoulos Electric has been a pleasure to work with over the last several months in getting my home in good order. He has updated countless fixtures in my house and installed an EV charger. Very professional and would highly recommend. "

"STAY AWAY. Numerous issues and they will cost you more money without you knowing it. I just found out that I was on a **DO NOT SERVICE** list (after all the grief they have given me.) I am ticked off. Here is a summary due to the character limit: 1. They installed a faulty HTP tankless hybrid water heater. I argued with them for what I think was a good year before a HTP tech finally determined that I was right. Replaced it with a Rinnai RUR199in. 2. They took (stole) my oval ductwork and replaced it. I was fine with the replacement. I looked the other way but it was expensive and they never asked - they just hauled it away. Most homeowners probably do not realize how expensive and unusual that oval ductwork is. I could have even recycled it at a profit. 3. I recommended them to a neighbor only to find cops all over their home one day. Their plumber stole their special needs kids controlled medications after having them go into other rooms to turn on and off the faucets. I just chalked it up to a bad apple. 4. HUGE ROOKIE mistake. They short-cycled the new air handler. Vent was right next to the main return (2in. away.) Unecessary wear and tear, high electric and gas usage, and discomfort. Whatever was coming out was immediately suck back in. Unfortunately I did not realize this until a couple years later. 5. HUGE ROOKIE mistake. They never installed the 2-stage wiring. See directly above. Look it up. HUGE discrepancies in temperatures and sky high bills. Premature wear and tear. I wrote Freddy Jr. about this which might be the reason why I am on their list. But still, that is their job to get it right and not mine. Most people would have no clue for the life of their system. 6. They did not hook up the high-limit kill switch/float on the condensation pump which led to a flood and destroyed antiques. I hooked it up in less than 10 minutes. 7. I was told one day that the original manger was fired because he was skimming clients from the company. 8. There is no check valve on the recirculation line which they installed on the new tankless they replaced. I believe it is code and now I have to hire someone else ([business name removed]) to fix their screwup which likely killed my internal recirculation pump. Again, unecessary wear and tear along with high energy bills. I was willing to look the other way on so many things but the truth is they get away with this because most homeowners do not know any better. In other cases, I figured that no one is perfect and we all make mistakes. But then to find out that I was blacklisted a few years later because I called them out on their BS after I needed their help yesterday? The only thing I can think is that I ended up costing them more money on things they should have done properly in the first place. It is a company that needs better oversight and apparently has awful management. I am not bragging but I have an advanced engineeering background creating petroleum engineering training material for big oil (aka plumbing on steroids--makes this look like childs play), programming, developing systems for hydroponics, working with heat and waste recovery systems, fixing combustion engines, and building computers for over 20 years. My point is that I noticed a lot of things that most people would overlook because I know how many things work. I called them out and that is the only explanation as to why I could have been blacklisted. But do yourself a favor and go with [business name removed] or [business name removed] instead. It is not to say that others cannot screw up, but this is my experience with them and the straw that broke the camels back. Mention that you read this here and thank you. Perhaps the next company will not mess you up under the guise/protection of teamsters and protectionist unions that overcharge with ridiculous licensing requirements that ends up meani..."

"Very quick to respond and came quickly to help with an issue at my parents’ house. He did a great job, and the price was fair. We will hire him again when the need arises. "

"Went on Angi on a weekend after noticing an outdoor electrical outlet starting to pull away from the wall. Joe reached out immediately by phone to and was here Monday to take care of the issue. Also capped / removed some old outdoor lights. No complaints and easy/friendly to work with."

"Joe O'Connell did extensive rewiring to replace knob/tube wiring in our 150 year old house. The project involved running new wires through walls and ceilings into over six rooms, along with upgrades to electrical panels. Joe and his assistant were very courteous and respectful - they were careful to cover the hardwood floors and use drop cloths to control the dust, and vacuumed up at the end of each day. Joe did great work, everything to code, no cut corners, and brought to my attention some concerns outside the scope of the project that we also had him address. He is a good communicator and returns phone calls promptly. I completely trust him and the work he does, and recommend him highly."

"Joe replaced my smoke/CO detector and did a great job. He was quick to respond and very professional. Would recommend him to anyone looking to have electrical work done."