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    O-Zone Heating & Cooling

    3.7 (3 reviews)
    Closed • 7:30 am - 1:00 pm

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    7 years ago

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    Harmonic Heating & Air Conditioning Naperville

    (88 reviews)

    Harmonic Heating and Air Conditioning is the BEST!!! Our AC…read moredied and after another company told us that our unit could not be repaired and had to be replaced ($6,000), we contacted Harmonic for a second opinion. Daniel the service technician opened the unit up and tested everything. He took the time to explain what he was doing and why. He discovered a bare wire that had been chewed (possibly by a mouse) and was touching the metal housing which tripped the circuit breaker. Daniel replaced the wire and the unit is working perfectly. The honesty and integrity of this company is refreshing. We will not hesitate to use them again and recommend them to all our friends.

    Stay away from this business! My entire cooling and heating system was left in an inoperable state…read more I called for a diagnostic of the air conditioner today because cool air isn't coming from the vents. I was told the diagnostic would cost $149. I asked to be informed of any repairs that had to be done. Technician checked the system and recommended replacing unit. We discussed replacement unit and cost. I was ready to pay deposit. In the next 10 minutes I was told that the model I selected is old and not available. New model costs $1000 more. I asked for a proposal to decide later. Technician told me that the visit costs $396. He said that he fixed air conditioner that was not working. He never told me that he is fixing anything. Through our the visit it looked like he was figuring out the problem. I talked to the owner and we agreed that any repairs that were done will be undone so that I do not have to pay for repairs. Then the technician removed all the wires from the board making both heat and fan unusable. He did not just undo the "repairs", but made entire system unusable including fan and heat which were working before his visit. See the photos to show what was done!

    R J O'Neil - Rooftop Replacements

    R J O'Neil

    (5 reviews)

    Needed to have some heating work done at my place of business, after our heating unit stopped…read moreblowing warm air. It was quickly becoming an issue for my employees, and if we didn't get it fixed soon, we would have to consider canceling work. I called one company who came out, and then told me that I really just needed to replace the furnace, and gave me prices to do that. I reached out to R.J. O'Neil for a second opinion, and boy am I glad that I did. They initially said they couldn't make it till the following AM, but an hour or so later I received a call that their technician had finished a job earlier than expected and could make it out today. Great News!! The technician came out, and after troubleshooting, found out that it was a processing board that needed to be replaced. He ran back to the shop to grab one and made the switch. We had heat back up and running by the end of the day. Being a business owner, it is always nice when you can find a trustworthy company that isn't just out to make a quick buck, but to foster a business relationship. I will definitely use them again in the future for my business and personal HVAC and plumbing needs. I also will continue to refer them to others. A big thanks to the team for getting our heat working so fast.

    Charged $492 for a service call which included their time spent driving around looking for…read morematerials and ended up with no fix. Had to send several emails and make several phone calls to get a response and they finally knocked $80 off bill.

    Service Plus Heating & Cooling - Our teams help make magic happen!

    Service Plus Heating & Cooling

    (9 reviews)

    We are beyond satisfied with the work/installation of our new furnace and a/c at our home. When we…read morepurchased our home, we were told by the inspector that the furnace was very old and that it would need to be replaced in a near future. It made a loud noise when turned on and finding parts for it was very difficult, it took a lot of space and was not efficient by any means. Every time we changed out the filters they would be covered with layers of dust and it really concerned us that that was what we were breathing. We finally decided to look into replacing our furnace for something that would help us save money with our bills and that would have the capacity to warm our house in the winter and keep it cool in the summer. The current system didn't have the power to do that, my bedroom which is located in the top floor was very hot in the summer and cold in the winter, we had to put fans and space heaters to make the room feel comfortable. We met with Cesar and talked about our concerns with our system. We were somewhat afraid about costs but soon those fears were gone because we were given options that would meet our needs and budget. Cesar knows what he is doing, he is very knowledgeable and explains with detail each option available. We were able to build our own "package" and felt very happy with the services. Next step was replacing our old ice age system, Ramses did an excellent job making sure all was in place keeping us informed of anything that may come up and explaining when we had questions. We are so happy to have made this decision and not wait till winter time when we would be in a bad position without heat. Summer is coming and my home is set with the best smart system that not only saves money but cleans the air and keeps us at our max comfort level. Thank you Service Plus Mechanical!

    New HVAC system recently installed. We are having a few problems which are being addressed.read more

    Neighborhood HVAC

    Neighborhood HVAC

    (4 reviews)

    I had an emergency situation and was in dire straits; my furnace failed in freezing temperatures…read more Neighborhood HVAC came to the rescue and saved the day!! They immediately evaluated my entire HVAC system and due to age and condition it was deemed it would be most beneficial to replace both the furnace and A/C unit along with my water heater; they were all 30 yrs old. The entire work crew was professional and courteous and completed the work in a timely manner. They also cleaned my entire duct system and clothes dryer venting and showed me before and after photos - WOW...what a difference!! I'm so thankful they were available to assist me, and they were more than honest and helpful in this unfortunate situation. Other HVAC contractors were quoting me quite a bit more for the same replacements without the duct and dryer vent cleaning. THANK YOU DALE AND YOUR ENTIRE WORK CREW FOR ALL YOUR HELP and I will definitely recommend you to family and friends. TWO THUMBS UP!!! :-) TH

    I was recommended to Neighborhood HVAC by a good friend and I'm very thankful I took his advice…read more Dale was extremely professional and knowledgeable of his craft. He was very easy to communicate with via phone or email. And they were extremely prompt. With a crew of two, Dale and his partner removed both my old furnace and ac unit and replaced them both, all between the hours of 830 am and 3pm, even worked through lunch. I would definitely recommend their services to anyone.

    O-Zone Heating & Cooling - hvac - Updated October 2026

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