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

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

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

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

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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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

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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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

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

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

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

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

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

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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Ozone Service installed a multi split system for us recently and we appreciate all the good work that was done. The system works very well. My son enjoys the comfortable cooling system this summer. Konstantin recommended the right system for our house size and needs. The team members were nice and knowledgeable and professional. Their work is clean and beautifully done. They tucked all wires into place and painted the conduit covers to match with the sidings of my house. Such quality work! We are happy that we could trust Ozone service to help and provide us with our HVAC needs. Thank you so much! read more

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

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

Fantastic service. Seriously. I had obtained other quotes prior to choosing OZONE and I definitely made the right choice. We could not be happier with the speed of the service, the parts availability, the fairness of the pricing and the thorough approach Tim took towards both diagnosing the issue and making sure that the rest of my system is in good operating order. This company is a true gem. Here's hoping I don't need any more emergency HVAC servicing for a looooooong time but if I do I certainly know who I'll be contacting. 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

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

Took a video to get an estimate to install a mini split for the living room. Got the estimate within 48 hours. Approved, scheduled for installation within one week. Took 1 whole day of work (10-6). read more

My crew damaged a thermostat wire during an insulation install at a property in Cupertino. Constantine was quick to answer and get a technician to the jobsite within 30 minutes. They also fixed the problem same day! Right before Christmas I couldn't have asked for better customer service. Will definitely use again in the future. read more

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

I have had Alex install a "central" heat pump with new ductwork and a mini split in an out building, and I can highly recommend his team. They are on time and do quality work. His layout of the central system seemed to be functional, yet it made the inspector's job easy. He did such a good job that I had him come back to do my attic vent fans. Book him without hesitation. read more

Really great service from Alex. We had this old metal filter box that got stuck and I can't get it out. Alex is really prompt in Yelp and punctual. He fixed the issue with very reasonable prices in one visit read more

Alex was great. He showed up on time, was courteous and got the job done quickly. Highly recommended!

This sir has very much experience in this area and he found the problem super fast. He helped us fix the problem and even did a great evaluation for other parts, just to make sure everything is working properly and efficiently. I highly recommend his services. read more

Have heat pumps installed with them and did amazing job within the timelines. Konstantine made a good design of the system

Hired Ozone to fix my old furnace. It was an older model so parts are hard to come by. This guys replaces all the faulty parts and return the old furnace to life. Highly recommend those folks. Their price is fair and communication is on point. read more

Ozone was great to work with. Konstantin responded quickly via Yelp and Alexander visited on site. He was informative, helpful and direct and fixed our old furnace the same day. I highly recommend them. read more

Andrew came out home and within a few minutes identified the root cause of our gas furnace not working and fixed with the hour. I really appreciate his helping in getting our home warm again! read more

Excellent service.. Konstantin was very knowledgeable and friendly. He explained things well and answered all the follow up questions promptly. read more

Konstantin and team did an excellent job according to our request and on time as planned. Thank you.

I reached out to a number of electricians/HVAC companies and Ozone was the first to respond (within minutes). We set up a time and Alex arrived within the scheduled window. Once he found out that I really needed an electrician and not HVAC service, he said he would check out the issue anyway. Ultimately he resolved the issue and got our Google Nest powered up. He was thorough, deliberate, organized, clean, and courteous. He was making ready to leave when he realized there was still an issue with the power to the Nest, so he went back upstairs and continued investigating until he found out what was going on. He then explained what was happening and listed some options. I've read several incredibly positive reviews about Ozone Service and am happy to add yet another excellent review for a professional, skilled, and highly qualified company. read more

One of the first to respond. Provided flat rate quote from project description and photos provided. Did not charge extra for air intake being over staircase. Sent photos of completed project showing clean and professional work. Included photos with measurements to show in code compliance. Scheduled directly with tenants. Saved considerably over other providers. read more

Alexander was very knowledgeable and responsive. He didn't upsell anything and found the source of my leaky mini split ac and fixed it right on the spot. Very professional and great value read more

OZONE Service - Fixing the leak in my ac mini split - Heating & Air Conditioning/HVAC Near Me - San Jose, California

I recently hired Ozone to replace the furnace with a heat pump at our home. They recently finished the project and man I glad that I hired them work on this project. Konstantin mentioned that they are a new company but I felt very comfortable working with hime after few conversations and experiences I gathered from talking to other HVAC companies. We had a 1970s dated furnace and inadequate ducting system. I started working with Konstantin on laying out my requirements and he help me understand my options, pricing and was very transparent on what can and cannot be done (no overselling and took time to explain things technically). I had talked to 5 more companies and very few took time to explain the options. Even his price were amongst the best in the lot. Once we decided on the options we got to work with Alex (their lead installer) and he is very knowledgable and is very hands on guy. He was there at the site everyday working along side their technicians, making sure things are technically correct and meets the standard. They worked through 90 degree heat and still finished the project in time and the whole system installed cleared HERS testing and city inspection without any issue. Alex seemed to be very passionate about HVAC and provided genuine advise on all places we needed to make a decision. Alex even diagnosed an overflow issue in a different system within 5 mins where other HVAC companies tried to take advantage of the situation and upsell so many services. I will definitely recommend them for all items HVAC. The team is honest, professional and hard-working. read more

We had just moved into our new home when the AC stopped working--right before a weekend heatwave advisory. Ozone responded to our service request immediately, and a technician arrived early Saturday morning. He quickly diagnosed the issue as a dead blower motor, walked us through all the possible solutions, and provided an estimate to replace the motor on Monday as soon as the parts arrive. read more