Ilya was professional, punctual, and clearly knew exactly what he was doing. He explained the issue and the recommended solution, answered all my questions, and completed the work efficiently without any upselling or surprises. The quality of the repair/installation was excellent, and everything is running perfectly now. I fully recommend Ilya and this HVAC company to anyone looking for reliable, honest, and skilled service. Will definitely use them again. read more

Recently, our AC wasn't working. We contacted Alex and he fixed the issue for FREE. Our AC and furnace was installed by Alex four yeas ago. He is not just incredibly knowledgeable and skilled, but also a genuinely kind, patient person. Once you experience OZONE's service, I am confident that OZONE will be your first choice for any future HVAC needs. They are the best you can get. read more

I had a great experience with Ozone Service. The scheduling contact was very friendly and offered different appointment times. He was able to schedule me for an appointment very quickly, which was a huge relief since my air conditioner had stopped working during a hot spell. They offer a free diagnostic service, whereas others do charge a fee that can be applied towards same day service; I felt offering a free diagnostic shows they are confident in their service offer. The technician, Ilya, informed me of arrival plans, arrived on time, was professional, and took the time to thoroughly explain what was causing the issue and how he diagnosed it. I appreciated that he walked me through the findings in a way that was easy to understand, without making me feel pressured. I received a written quote online with details of repairs to approve in an app online, We also discussed the age of the unit and typical issues that could arise in the future for maintenance and replacement planning. Repair was completely quickly and there is a 1 year parts and labor warranty included. Based on my experience, I would definitely recommend Ozone Service to anyone looking for honest and professional HVAC service in the Bay Area. read more

OZONE Service - Heating & Air Conditioning/HVAC Near Me - San Jose, California

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Fast response Professional service Reasonable charge Still need more time to assess if the replaced components are good quality in one year, I hope it is way more than one year! read more

They never let me down. This is my second time working with them. Konstantin reply me very fast and coming in the second day. Explaining the choices and have a detail document of everything, and difference between each choice. I start to fall in love with my house after their work. Konstantin is an honest, professional person that I have ever met. I have no doubt they have 100% satisfaction rate on the website, since they are good at listening and understanding people. I replaced my HVAC system here, GREE is my favorite brand in China. Happily they provide this brand to me this time. read more

OZONE Service - Heating & Air Conditioning/HVAC Near Me - San Jose, California

They are very fast and professional. They came estimate new HVAC system for free with comprehensive measurements and estimates. They cover the whole services including permit application, installation and clean up. They responded my emails in a timely fashion. They provide long term maintenance. Everything is perfect. read more

OZONE Service - The new AC they installed professionally and quickly. They moved the whole system to our side yard to save space. - Heating & Air Conditioning/HVAC Near Me - San Jose, California

Great service. They were able to accommodate quickly ahead of their schedule. Ilya came next day to get my ac running. Plus they gave free estimates and a check up of the unit to get a general sense of the system. read more

OZONE Service - Heating & Air Conditioning/HVAC Near Me - San Jose, California

We just got our old AC repaired by Ilya. It was a great experience. He came on time and inspected the system and gave us an unbiased view on the repairs. Even though our unit was 17 year old he did not push us to change it but gave us options. Even educated me on the heat pump idea which will be beneficial for long term. We did repairs for now but I am sure we will call him when we decide to replace read more

Excellent experience with Ozone Service! They were able to come out on short notice when my AC stopped working. The technician quickly diagnosed and fixed a failed capacitor and another electrical component, then topped up the refrigerant and made sure everything was running perfectly before leaving. He was professional, knowledgeable, and took the time to explain everything clearly. Fast, reliable service--I highly recommend Ozone Service! read more

AC didn't work after my vacation, it was so hot for a few days. We were like in the death valley. It's was so fast to diagnose the issues and everything works fine. Thanks!!! read more

OZONE Service - All done in short time - Heating & Air Conditioning/HVAC Near Me - San Jose, California

Wanted to change gas furnace to electric heat pump that can qualify for upgrade rebate. Found ozone from Yelp and saw it has good reviews, so decided to try it out. Turns out their services are really good. Konstantin was helpful and responsive throughout the process. He's able to provide quote for different brands and explain the pros and cons for each of them. The price is pretty competitive too compared to other service providers. A bonus is that they can also do duct replacement even it has asbestos. It saves the trouble of finding another guy to do the work separately. The heat pump installation was successful and looked good. They are able to help out with the permit and inspection too. So the whole process was smooth and nothing much needs to be worried about. The thermostat wasn't working the next day and I requested them to take a look. They were able to send someone to fix it the next morning too. read more

OZONE Service - Heat pump installed - Heating & Air Conditioning/HVAC Near Me - San Jose, California

Ilya was professional and quick to diagnose the problem and fix the issue. Very happy with the prompt service.

Our A/C stopped working right before the holiday weekend, of course. Ugh. I reached out to Ozone because of the great reviews and Ilya was able to come out that afternoon (Friday before July 4!) to assess. He was tremendous - very knowledgeable and thorough. He suggested a couple of options but was not focused on selling the most expensive thing. Much appreciated. Thankfully, the equipment was in stock and they were able to come Monday morning. Ilya came back with a coworker and they installed a new system. Throughout the experience, both Ilya and the rest of the office provided quick, helpful answers to questions, and really listened. I'm happy to report that the new system is working great and is much more efficient than the old one. An all around great experience - I highly recommend. read more

I cannot say enough about Ozone Service, Konstantin and the entire team. From reviewing our options, explaining the technology, filing permits and helping us with rebates, they could not have been more patient and thorough. The installation was meticulous and our inspections were a breeze. While I had reached out to three different companies to quote my heat pump, Konstantin has the most knowledgeable and did a wonderful job explaining my options. Seriously, I love my heat pump! My home is SO comfortable ALL the time! read more

Very professional and smooth service. Ozone was able to accommodate an urgent appointment within 1-2 days. Andrew came in for a free diagnosis and helped us fix the contactor, capacitor, fuse within 1 hour. He also did thoroughly testing to ensure that everything works! Highly recommended service from Andrew and Ozone. They also offer 1 year warranty. read more

Ilya is prompt, professional, knowledgeable and respectful. He performed diagnosis to isolate problems and proposed remedial suggestions. He leaves a trustworthy impression. I highly recommend the company and their service. read more

Very knowledgeable and was able to resolve my issues effectively! I would definitely call them up again!

I am satisfied with the work done from Ozone Service, especially since they specialize in the HVAC system I have that needed repairs (heating). Andrew was nice, professional and efficient with the diagnosis and completing the repairs. They also worked with my home warranty company which was great. I would recommend Ozone Service! read more

Called Ozone about another outage of our heater. The technician came the next day, tweaked some settings, and then told us there would be zero charge for the change. He came out for free, and said he didn't fix anything. I think Ozone needs to give the entire world some lessons on customer appreciation and general kindness. They are amazing, and I highly recommend their services. read more

They provided timely responses, the technician was on time, very professional and efficient. Would recommend them for HVAC repair.

I installed Google Nest Thermostat Gen 4 last weekend. Due to my personal mistake that I forgot to turn off the power when installing the device, I got "rh no power" error when setting up the new device. I tried to fix it but I don't have professional knowledge or equipment. Found the Ozone Service on Yelp and the owner offered FREE inspection. I cannot believe my eyes since all the other merchant I've quote all ask for an inspection fee of $69 or more. The technician Alexander dropped by my house by the appointment time, and did a quick check of the heater within 10min. To my greater surprise, they fixed my broken fuse for FREE. I couldn't believe my ears and it is too good to be true. I cannot recommend Ozone Service enough for their excellent service, professionalism, speed, reasonable price, and care for the customers. Will definitely call for their service again if I have any issues with my HVAC system in the future. read more

OZONE Service - My new Google Nest thermostat is working after fuse replacement - Heating & Air Conditioning/HVAC Near Me - San Jose, California

10 star if I could. Furnace went out weeks ago and I put out a bid request on Yelp. The first company I hired (Global HVAC) charged me $250 for a fix that failed the very next day. I called and the company said I should replace the motherboard for another $1,000. Instead, I called Ozone and Andrew came out on short notice. He found a rusted connector within minutes and replaced the piece AT NO COST!!! Shocking! He said he couldn't charge me because he didn't repair anything on the furnace and they don't charge for diagnostic. Unheard of. Ozone is the Nordstrom of HVAC. Amazing, reliable, and trustworthy service. I'm hiring them for my AC unit next. Thanks you Andrew! read more

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Very prompt response! Great assessment of issue and quick follow ups to fix it within 2 hours of reaching out! Would definitely re hire their help in future! read more

Ozone is the best HVAC service I have ever encountered. Our 15-year-old furnace suddenly lost power, and we tried everything we could to diagnose it ourselves--using AI tools, replacing the fuse, and attempting multiple fixes--but nothing worked. Once we decided to seek professional help, the Ozone team responded incredibly fast and scheduled a free diagnosis right away. The technician, Andrew, arrived exactly on time and was extremely knowledgeable. Within five minutes, he identified the problem: a hidden switch that had been accidentally turned off. It was honestly a bit embarrassing. We felt we owed him a diagnosis fee or at least a tip, but he refused and explained that their diagnosis is completely free and that he was simply glad the system was working again. I never imagined a business would treat customers this well. We are planning a home addition and AC expansion in the future, and Ozone will absolutely be our first choice. I highly recommend Ozone to anyone with HVAC needs. read more

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Honestly I would give 100 stars if possible. We had OZONE install our HVAC system and to say we were impressed by the work would be an understatement. Konstantin and the folks at OZONE were extremely competent, honest, and hardworking. Their quoted price was extremely competitive and they are very responsive to our questions. Everyone in the OZONE crew is very polite and considerate when coming into our home. Despite telling them they didn't need to put on shoe covers, they insisted all the same. They treated us and our home with respect. We will use OZONE for all of our HVAC needs. I enthusiastically recommend them. They are the best you can get. read more

My AC wasn't working. I recently had a new furnace and thermostat installed. Ilya quickly diagnosed that the installer had neglected a connection in the thermostat needed for the AC to turn on. read more

I recently hired OZONE HVAC to replace our 50-year-old furnace with a new Gree FLEXX heat pump, and I couldn't be happier with the experience. I got quotes from over five HVAC businesses before selecting OZONE. From the beginning, Konstantin, the project consultant, stood out with his patience, honesty, and technical knowledge. He thoroughly walked me through all the options: new furnace + AC coil, new furnace + heat pump, and a pure heat pump system. He explained the pros and cons of each, including performance, pricing, system size, and rebate eligibility. What impressed me most was his transparency -- he shared that OZONE is a new company, but the team came from another well-established business. Their edge? High-quality service at a competitive price. That, plus their diligence during the quoting process, made them my top choice. Although OZONE is a newer business, they handled everything as seasoned pros. I was their first client for a project of this scope under the OZONE name, and they took care of everything needed to get certified with Peninsula Clean Energy (PCE) so I could qualify for the $1,500 rebate and $10,000 interest-free loan. They processed the paperwork quickly and guided me through it clearly. Alex and Roman were the engineers who installed the system, and they were phenomenal. Alex even came out on a weekend before the install to inspect the house. I had questions about zoning by floor, and unlike other companies who gave vague answers, Alex crawled under the house, mapped out the duct layout, and clearly explained why zoning would be complex and costly due to our setup. During installation, Alex and Roman worked almost non-stop for two days. Our house is on a slope, so they had to build a new concrete platform and move a 100kg outdoor unit into place -- no small task. They also did all the electrical rewiring, mounted clean and organized ductwork, and ensured every seal and connection was done to a high standard. They kept us in the loop for any decision that might affect us, like routing the drain line or reusing the old thermostat location instead of just drilling a new hole. I also had a chance to chat with Alex during one of his breaks -- he's not just incredibly skilled, but also a genuinely kind and passionate person. He mentioned he has installed over 1,000 HVAC systems in his career and even proudly showed me photos of large-scale commercial HVAC installations he had worked on. You can really tell he takes pride in his work. In short, I was blown away by the quality, professionalism, and thoughtfulness of the entire team. Konstantin, Alex, and Roman are skilled, friendly, and honest people. I highly recommend OZONE HVAC to anyone considering an HVAC upgrade -- they absolutely earned my trust and future business. read more

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If I could give more stars, it would be 10 for Ozone Services. We had the pleasure of working with them on installing a new Heat Pump System in our home. I love it! Our 32 yr old original gas furnace & ancient AC unit finally met the Grim Reaper. I was not feeling comfortable or cool in the evening. The house was still 80*. I started a Yelp Project & chose Ozone Services to evaluate & was hopeful we could still fix, but already knew it was time to invest in a new system. Arg..I just changed the Mother Board last Thanksgiving. I was able to have an appointment on a Saturday. Alex was our technician, tested our outdoor unit before opening our furnace in the garage...our refrigerant/coolant was leaking out from the coils & froze a section producing condensation. I knew right away that Alex was an experienced technician, very knowledgeable, & professional. He gave his honest opinion. We need a new unit. We were able to get an appt with Konstantin, Project Manager the next day. I was able to appreciate his knowledge on Heating & Cooling, being able to understand in a simple explanation what system would work best for our home. My husband wanted more quotes in addition to wanting a specific brand... I was sad during this time because I wanted to start right away. We applied for San Jose Clean Energy Rebate: once approved we were able to move forward with the Permit. We decided to have Ozone Service install our new Goodman Variable Speed with Inverter Tech Heat Pump System, Goodman Air Handler: variable speed , & Goodman thermostat. Alex, lead installer & Harry, 2nd installer are the most efficient & hard working individuals. Tested our unit, heat & cooling. Showed me how to operate the new thermostat, where the filter needs to be changed & size, etc. Why did we go with Ozone Services? although they are a new company, I knew by speaking with Konstantin & Alex they are both very knowledgeable & care about their customers, but after so many quotes, they are give their honest opinion & evaluation for your home needs. Communication was great via Yelp & text. Any questions I had, Konstantin would answer. Tx you :) very accommodating with scheduling. I was willing to wait a few weeks due to my schedule, but they did their magic with the schedule & technicians. I greatly appreciate it! :) We are also lucky our entire unit failed this year because we were able to apply for TechClean Ca Rebate in addition to Federal Tax Credit. Even if there were no rebates, the price for labor & equipment was very reasonable. (in my opinion). They are my GO TO for our maintenance of our new heat pump & 2nd AC unit upstairs. I wouldn't go to anyone else. I highly recommend this company for your home services. Thanks again for all you do!! :) read more

Our hvac ducts were damaged due to rodent activities. Contacted OZONE for a quote and Konstantin showed up on time. He is very professional and patient with our endless and native questions. Pointed out details that we didn't notice and provided his recommendations with details. After our meeting I had follow-up questions. The team responded quickly. The whole communication was very good and smooth. On the day of installation the crew showed up on time, explained the process, and did the excellent job and verified everything works. I am very pleased by the team and the service and I am super happy with the heating now. It is very strong and powerful. Highly recommend OZONE and Konstantin for their service! read more

Andrew is a total pro. My AC condenser wasn't spinning, and after I failed at several DIY fixes, he quickly diagnosed a broken signal wire hidden inside the wall. Instead of suggesting an expensive re-wiring job or a messy conduit, he used an X-wire solution to bypass the break. Fixed it efficiently and for a fair price. Highly recommend! read more

We recently had Ozone install a dual heat pump + furnace system with zoning for our home. They were very efficient and professional throughout the whole process. Unlike a previous furnace contractor who told us we needed to redo a lot of ductwork, Ozone showed us that wasn't necessary -- they adjusted the dampers and duct sizing instead, which saved us from having to tear up our newly finished hardwood and tile floors. They also fixed issues from the previous furnace installation that wasn't up to code. Their pricing was very reasonable for the quality of work. Overall, highly recommend Ozone for HVAC projects. read more

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These guys are great. I've recommended ozone to several people and they've all been happening as well. Alex really knows what he's doing - and takes a lot of pride in doing his work right. read more

We need HVAC duct and plenum installation and inspection for potential leak risks. Konstantin came to provide us with a reasonable quote. Andrew, the tech lead came over to do the job. They are professional and clearly know what they are doing. Will recommend their service if you need help with HVAC and electrical work. I know they will be licensed for plumbing work too. read more

My AC was leaking water from the attic, and I had to find out the cause of the leak fast to avoid further damage. The first company I contacted only told me that the drain pan is broken, and it was until OZONE's Alex came that I found out I have severe ice buildup in my coil. The drain pan was slightly broken, but the big problem is low refrigerant. That really gave me a good impression with OZONE. I decided to dig a deeper into them. As it turned out, the folks who started OZONE (Konstantin and Alex) were very seasoned HVAC professionals. Two years ago when I was trouble shooting my not-cool-enough AC, I had contacted Konstantin and he was super helpful to find the cause. They were with a big HVAC company at that time and repairing is too small a job for them (I believe Konstantin was also only responsible for new system sales?) Anyway, in the hindsight, they were exactly right. There are leaks in my coil and I should have replaced the coil. Fast forward, I hired OZONE after I found out our history. The process is very smooth. Alex came out on July 4th to run a leak test to find out it is indeed coil leak (plus some leak on the outdoor unit's connection joints). And next week on the heat of Friday Alex spent a whole morning helping to dismount the old coil, replaced with a new one, vacuumed system and tested one more time to make sure everything is working. He showed me all the parts he took out, and let me know all the changes he put in very clearly. In all, I highly recommend OZONE to anyone with HVAC needs. They are professional, communicative and no-nonsense HVAC experts. Their pricing is also very reasonable. read more

We were having issues with our furnace running and then stopping unexpectedly, so I decided to schedule a diagnostic appointment. The booking process was super easy, and they were able to get Alexander out to us the very next day. Alexander is honestly the best. He is incredibly knowledgeable and was so patient throughout the whole process. He took the time to explain every step of his workflow as he went along. He tested every single thing that could possibly go wrong to make sure we wouldn't run into issues again. We will definitely be reaching out to Ozone for any future needs. Five stars! read more

I rarely write reviews, but extraordinary people deserve the recognition. Ozone recently installed a Harvest Thermal system in our home--a major undertaking involving new ducting, a heat pump water heater, a main heat pump, basement mini-splits, and an all-in-one system for a separate living space. Alex and Konstantin were the definition of consummate professionals. From the initial design to the final implementation, they truly had our best interests at heart. They are incredibly smart, competent, and treated our home with the utmost respect. Beyond the technical work, they guided us through the maze of utility rebates, state programs, and an interest-free loan. I can recommend them without any hesitation. Don't think twice about hiring them. read more

Good service. They called me in less than 5-min from posting the project on Yelp. They diagnosed the issue in less than 10-min and had fixed my AC in less than 30-min. I was super amazed at how fast they were able to identify the root issue. They even went the extra mile to measure the performance of the AC after the repair. I'll definitely reach back out to them! read more

They respond really fast and come on the same day as I requested. Andrew is very patient and has strong expertise. He identified the root cause and changed a parts of my furnace, helping me save money to fully replace it. read more

Clear communication, fair pricing, and punctual staff. Work was completed efficiently and professionally. Highly recommend.

Alexander was very quick to respond, and was kind to explain things. I would contact again on my next - hopefully not too soon - HVAC problem. read more