This is the worst company I have encountered when hiring contractors and paying for membership plans through the years. Green Air actually took over Certified Heating's clientele (I was with Certified for 2 years) and they were wonderful. After they took over, they already cut down our maintenance visits from 2x a year to 1x a year. I wasn't too happy about it but the techs that came were nice and cordial. However, I'm not really sure what's going on. Maybe new management. I had my last maintenance service done in 6/2025. I moved in Dec 2025 and transferred my service to the new address. I scheduled a maintenance service for end of this month and just last Thursday, I got an update email that they were downgrading and removing all HVAC tune ups, air filter changes and solar cleaning. Basically all the benefits that I chose to pay the membership. What really angers and frustrates me is how no one is picking up their phones and it goes straight to vmail. When I did finally get an email reply, they stated that they would only apply my 5 month payments to the maintenance fees, so they basically didn't count the previous months I paid at my old home. I feel like that is pretty unfair, that I paid a full year to have no maintenance included and I would have to pay more money on top to match whatever fee they say maintenance services are currently. They didn't offer a refund or that my service I already scheduled back in May would be taken care of. Now I just want to cancel and take it as a loss since I can't get a clear answer. I will have to find a new company that hopefully cares about their customers. read more

Green Air Heating and Air Conditioning - They sent this on 6/4 giving one day notice... - Heating & Air Conditioning/HVAC Near Me - Concord, California

I've been a loyal customer here for over four years, but after my experience today, I am completely done. For the last 14 months, I've been paying my monthly fees faithfully, yet I haven't received a single service visit. No maintenance, no proactive calls, nothing. Their billing system is a disaster and their communication is nonexistent. The breaking point was a call I received today. They told me they updated their billing system and needed to collect payment again. When I pointed out that I've been paying for over a year without a single person showing up to do the work, and that they have zero records of calling me to schedule.. they flat out refused to admit it. I asked to speak to an owner or a manager to resolve the refund for the service I never got. Instead, a man got on the phone, spent the whole time talking over me, and then actually HUNG UP up on me. Now, every time I call back to finish the conversation, it goes straight to voicemail. It is honestly ridiculous that a customer has to chase a company down to get them to do the job they are already being paid for. To be treated with such disrespect after four years is a slap in the face. Save yourself the headache and go with a company that actually values its customers and answers the phone. read more

Amazing job done by Jayman, Josh, Lee, and the team, they are extremely talented and professional. We love our double heat pump system. It was the best solution for us with the extra of relocating one air blower unit to give us a little extra space, so great value. The team is on time, ready for work and so respectful. We love you guys! read more

Green Air is an excellent, innovative company that delivers outstanding service. A professional crew, including Jayman, Joe, Josh, and Chris, recently installed two heat pumps in our home. This replaced the original solar system, which was installed in 2013, with a creative dual-fuel system (gas and solar). Now, the heat pumps provide heating and warm water around the clock and save us money. Thank you, Nick and team. read more

Came once. Said they would be back for more cleaning. Never came back but said I had to pay 2400 so they would complete complete work. When called it's always "We will call you back" and after MANY calls never a call back. I am so disgusted! read more

Poor communication, inadequate service, unethical tactics Our solar system was installed in 2017. In early June, 2025, energy output dropped by about 70 percent. I contacted Green Air, the original installers. I theorized that the inverter had failed, and was pleased to learn that it was still under warranty. Thus began a long series of almost daily phone calls to Green Air, asking for updates. Promised return calls rarely happened, but most importantly they NEVER SENT A TECHNICIAN to verify that the inverter had, in fact, failed. Apparently, my diagnosis was good enough. Green Air claimed that they were in touch with Solar Edge, the manufacturer of the inverter, and that the company was very slow to respond. Over the phone, one technician theorized that Solar Edge was "about to go out of business." One customer, he said, had been waiting for three months for a replacement Solar Edge inverter. Another had waited even longer, and ultimately had a new inverter installed from another manufacturer at a cost of several thousand dollars. I wondered if that might be an unavoidable option for us. So, after five frustrating weeks, I asked if there were any other manufacturers. I was answered with an estimate of almost $13,000 to replace the inverter and other components. That was a non-starter; it would obviate almost all savings in energy cost. Out of frustration, I wrote an email to the owner, Nick Donzelli, detailing our experience, calculating the diminution in energy output, and citing a provision in the original sales contract (which the owners had left behind) which specified that the system was warrantied for "25 years FULL parts, 25 years All labor workmanship guarantee for approved manufacturer claims." In response, I got a hostile email, ridiculing my confusion between Kilowatts and Killowatt hours, and informing me that, because we are not the original owners, Green Air would refuse service entirely, and that his team "is aware that we will no longer serve you." I did not contact Green Air again. Instead, I reached out to a company called Energy Aid. (Excellent! 10 stars!) Within a couple of days, they sent a technician who did a thorough analysis of the system. On the roof, he photographed the panels and tested the energy optimizers. Then he opened up the inverter and took pictures of the electronics, and photographed the wiring. I appreciated his thoroughness, and he told me that Solar Edge REQUIRES THESE ITEMS before they will honor a warranty claim. Green Air had done none of this, so if they did make a warranty claim, there was no chance that it would be honored. No wonder they keep clients waiting for months: it's an easy pretense to offer an "upgraded" system. Within two weeks of Energy Aid's proper diagnosis, they had replaced the inverter--still under warranty. It works perfectly. See my positive review of EnergyAid, if you're interested in getting the job done right. EDIT: After Green Air's response. 1) The company never offered to do a site visit. Had they done so, and charged for the service, I would have agreed, as I had done for a different problem after we acquired the property. We were charged $385 then. 2) I didn't even find the original contract, which includes the apparent warranty, until I'd spent a month trying to get Green Air to address the inverter issue. I quoted that provision verbatim, and the paperwork I have makes no reference to being valid only for the original owner. 3) As much as I would love to get into a pissing contest on Yelp, it's not worth my time. I will respectfully suggest, however, that Mr. Donzelli might have greater success in dealing with dissatisfied customers if he dealt with his anger management issues. I will now brace myself for a torrent of name calling, as in his previous missives. read more

Great stuff! Diego was transparent and helped explain the situation and our options clearly.

We had our power go out in one section in our house after a pg&e outage. We called and Jamen was amazing! He is kind, fast, very knowledgeable and explains things really easily. He was happy to answer my questions and incredibly professional. It ended up being a corroded outlet plug. He patiently checked every outlet in our home. He even found an issue that could have caught fire and fixed that. We will be calling green air from now on. The customer service even from office staff was outstanding! read more

Green Air has been fantastic from start to finish. We had a pretty complicated set-up and Nick was able to figure out the best possible Solar and Powerwall solution. The team are true experts and so enthusiastic about what they do. The installers were quick, clean and just really great people (sorry I can't remember all the names but thank you all). Maria expertly keep on top of all the paperwork, navigating PGE to get our NEM 2 application moved over from a different provider (who was not able to come up with a workable solution for us). To cap it off, we had an unrelated issue with our main panel and GA came out immediately, diagnosed the issue and got everything working again. I can't recommend them highly enough. Thanks you! read more

My air conditioning system went out late Friday afternoon. I was surprised when someone answered the office line after 7p on a Friday night. They were awesome and sent someone to fix the issue that next Monday. They did great work and I cannot thank them enough for being such a great company. I highly recommend them for all your HVAC, Solar, heating needs. read more

Jose and Nathan installed a tesla EV CHARGER and sub panel, did a fantastic job super friendly quick and efficient work reasonable price, highly recommend. read more

Green Air recently installed a Span smart electrical panel at my home in Oakland, and I couldn't be more pleased. While every project has its hiccups, the team was always on top of things, with clear communication and timelines. Big shoutout to Jayman and Joseph for everything. Would recommend! read more

Green Air Heating and Air Conditioning - Span electrical panel - Heating & Air Conditioning/HVAC Near Me - Concord, California

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I recently called Green Air and spoke to Nick about problems with our church solar system. Nick was very friendly and extremely helpful. He offered to help out to do what he could remotely. He did so, and didn't charge anything! We communicated on multiple occasions and he was very responsive to my texts, and called me back when I left a message. Thanks Nick!! Rich B. (Vacaville) read more

Green Air is a veteran owned business who does the right thing the right way the first time every time. We have used them for solar installation, HVAC replacement, Tesla Powerwall installation and service for all of the above. Nick and his team of professionals treat you right and give you the best price and service around. We have recommended Green Air to friends and relatives - we only do that with companies we trust. You can. Not. Go. Wrong. With Green Air. read more

Technicians came out as scheduled and went directly to work. Found a problem within the first few minutes. Most of my refrigerant had leaked out due to some sort of leak. They topped off the coolant and said to call if the system wasn't catching up with the outside temperature so they could try and find the leak before I had to pay for all new refrigerant again. I decided to sign on to their monthly protection plan in case of further trouble in the future.Both techs were friendly and professional. Even with my pups in the house. read more

Diego and Ben were amazing! This was my first service with Green Air and they took care of everything. Solar panels are all clean for the critical spring and summer months, the AC is ready to go and the furnace checked and maintained from the heavy winter use. So happy I was able to find these guys and have one company that can do it all. read more

We are new customers to Green air and today was the first visit to service our furnace and air conditioner for the season. We also had our gutters cleaned. Both Ben and Diego were fantastic. It was nice to have one stop shopping for gutter, cleaning and systems maintenance. Both gentlemen were extremely knowledgeable, very customer focused and patient when explaining to us different things about our systems. I highly revomnend Green Air, Ben and Diego. read more

Look for Thomas. he's awesome. Arrived, identified the issue, (and my favorite) showed me what he was testing/doing. and resolved my issue. Putting this company on speed dial. read more

We can't speak highly enough of Green Air. They have put in our Tesla backup house batteries, our solar rooftop system and heat pumps. So you can see, we have used them three times now and each time it has been a delight: their work was done properly, efficiently, and was reasonably priced. Their service is exceptional. Absolutely delightful to work with them. Workpeople and ownership are great and responsive. We give them our highest recommendation. read more

Green Air, I thank you for self-exposing your total disrespect to your potential customers. You save me so much time having to warn your potential customers of just who you have self-described you are! I thank you for including my complete correspondence saving me the trouble. Hard to believe you would be proud of your response. Again, this proves just what kind of business you intend to run. I can only let your new potential customers be warned of your intent for them as they judge your services. I have more if you wish to continue. I can't wait for the Lawyer part, and I am sure Yelp folks will remain interested as well! Best of luck in your next business venture 2nd RESPONSE: Green Air, Mr. Nicholas Donzelli: I can see now, after four more Yelp replies with you attacking me that you are a bit thin skinned and cannot handle constructive criticism. . I mealy stated that your company Green Air became the new Owners of Certified as they followed up on Certified's commitment to service my new heater. Green Air came out to do the annual inspection of my NEWLY purchased Heater from Certified. There were some issues with that heater and Green Air Technicians corrected them quickly. We thank you for that. I was asked if I wished to continue my annual service and I responded positively. Green Air sent me a DOCUSIGN agreement for more than double my previous agreement and that prompted me to question who would be handling the warrantee of my new $10,000 heater? Well, here we are today. I caution all of your prospective customers to be aware of just who you are! I respect your Service and apologies for your becoming disabled while doing so. I despise the fact that you hide behind it! I also see that your company has many honorable Technicians and I hope they can continue to serve the Public despite your miserable presence as "Owner". So now I will dissect your Second Response: I now see that you also stretch the truth while including the actual message to you. Amazing! YOU: I don't understand why you are targeting a Disabled Veteran-Owned business over $3/month. My cheapest plan is $11.95/month; you asked for it to be $8.95, and I said no. This isn't 3 times more either, as you claimed in your previous review. ME: I never targeted anyone and especially a Disabled Veteran! I reminded You that my previous Monthly Bill with Certified was $8.95 a Month. I did not ask, I expected it to be the same going forward. Your refusal forced me to inquire if you intended to honor the warrantee on my new Heater that you had just serviced under my existing agreement with Certified Heating. You threatened me with your reply. I am sure the Lawyer you speak of will present your threat in Court. Now YOU: VIEWERS: I'm proud to be an American Veteran who will stand up and fight against all enemies. I'm proud to show people that it's ok to stand up and protect everything you've work so hard for against self-righteous, entitled, and arrogant individuals. I won't let this weak culture take my voice, my will, my principles, and my freedoms that I fought for. I want to be an example to the younger generation and show them that it's ok to not be liked; I don't like you either. I'll pray for you. ME: Am I an enemy of the USA? YOU: 1st RESPONSE: This is the problem with social media and ignorance. Your self-righteousness is a direct reflection of your weak character and the reason why I stated in my response to you when you were negotiating non-negotiable pricing, "I prefer we part ways amicably, never serving you...I am going to have to ask you to find service and support from another company." ME: Please note that I never was negotiating with you or your Company. I did mention that I would be turning this over to BBB and any other Regulatory that can access your Business Dealings with Certified. YOU: Certified Heating and Air Conditioning went bankrupt. Green Air never purchased, acquired, merged, or whatever term people are using to justify not wanting to spend money with a company willing to help and serve them. ME I never received any notice that Certified Heating and Air Conditioning went bankrupt. Your assumption regarding that is faulty. You: Now showing ignorance: When a company goes bankrupt, all their promises to you, including warranties, go away. This is common knowledge; hence going "bankrupt"; everything and everyone lose. If the manufacturer stands by the product, that's different; however, the labor warranty, workmanship guarantee, etc. are all gone. YOU: You chose the path of a bully and met the horns of a bull. I encourage you to remove your post, and again, part ways amicably. ME I read and interpreted your email as demanding, threatening, and "matter-of-fact", which forced me to be "matter-of-fact". You will be hearing from my attorney since this post is erroneous and false. Here are the email exchanges since these will eventually be public records and I have nothing to hide. Challenge excepted... read more

Kelsey was amazing. Took care of everything in a timely manner and explained everything that he did

Excellent service and quality. Ben was super helpful in explaining maintenance and different options for the future. Thanks Green Air! read more

First experience with Green Air and couldn't be happier. Thomas (HAVC tech) arrived on time and was very approachable. He thoroughly explained my HVAC systems current state and his recommendations on keeping it running at peak performance. Monique in the scheduling office is also super kind and easy to work with. Thankful that Green Air was able to pick up my maintenance after being a long time customer of Certified. read more

Great service, very informative. very helpful. They checked upstairs vents, and also checked the ductwork under the house. Gave me new information for the future. read more

I have been availing of their services from before they moved and still I appreciate the professionalism and the care they take on my system. I highly recommend them. They work on your system and do not try to hard sell you. I am currently checking out the solar services now so I can have everything in one place. I really appreciate all the work they do and the people who work here. read more

Diego and Ben were great. Very knowledgeable and did a great job servicing our HVAC system.

Green Air installed solar, batteries and also a mini split in a detached building. The main advantage of working with Nick and Green Air was that they could work with me to design a solar system that fit the building, both the panels on the roof and all the supporting electrical equipment (panels, combiners, shutoffs, batteries) in a compact design that was functional, code compliance and visually clean on the house. In contrast, the national contractors (SunRun, Telsa, etc.) wouldn't let me talk to an engineer or designer and don't seem to care about covering your walls with a web of conduit and electrical boxes. The back office was a bit slow moving at times and needed follow up on permits, etc. but I think they are quite busy as are most contractors these days. read more

Green air is great, the equipment, the employees, all top notch. The are informative, patient and the equipment is efficient and effective. The service visits have all been positive. Diego came today to service the equipment and he was super helpful, knowledgeable and pleasant. read more

It was so welcome to find a competent professional team to install my solar system. I am not close to their location but with a short site video tour, some pictures and phone discussions we worked out what was going to be done, Nick and his team came down, did the install in less than two days and everything has worked well, we now have negative monthly energy bills! The office side and technicians were also easy to reach and they kept us informed in regards to schedule and timing. We highly recommend this team! Len B read more

Tom kicks ass. He is awesome. He will be my preferred technician going forward Good guy, very fair read more

We have used their services several times. We had them add Tesla Power walls and also add additional panels to an existing solar system. Recently, solar panels ,that they did not install, caused a roof leak and they removed all the panels and did an excellent job of repairing a challenging roof and reinstalling the panels. Anytime we questioned them, they explained to us exactly what was going on. I would highly recommend them and already have recommended them to many friends. read more

Don't use them. They over promise and under perform. Customer is never right and they do the project with the least amount of effort or consideration of the customer's needs. Had to return several times and correct their work. Left the work incomplete. Poor workmanship, lots of wasted time and not in tune with the term customer service. read more

Glen and the team did an amazing job installing a complicated Unico system for our upper floors. Then they tweaked a second unit installed by another company on the lower floors. I cannot believe how quickly they solved our air conditioning problems. Absolutely amazing read more

Diego was great! He has excellent customer service and very knowledgeable with servicing my HVAC unit.

Nick and Green Air just installed 9.1kW rooftop solar (21 Maxeon panels), two Tesla PowerWall+, a Tesla Inverter/Gateway, two SPAN panels, and all of this communicates together controlled by the Tesla app. I had a friend that installed this rig, and frankly, Nick was the only vendor that thoroughly understood it and had experience. Green Air was timely, clear, estimates and invoicing were clear and accurate, professional, the install and conduit routing is very well done and looks great, and the team members friendly and courteous. I couldn't be any happier, I'd like to give six stars. We just had an all day PG&E outage, and this system flawlessly kept everything running. Solar is not just about saving energy costs, it is also about reliable power and energy backup (without requiring gas like a generator). They were very helpful on Solar Credits, and our tax rebate of 30% made it very affordable! I can recommend them highly. read more

We hired Nick Donzelli and Green Air to install a new solar system on our home. They did an excellent job on the design and installation. I highly recommend them for your solar system. You won't be disappointed. read more

I had solar panels and Powerwalls installed. They gave me a fair deal, considering I wanted it done in a pretty complicated manner, that I don't think a lot of cookie-cutter solar companies could have managed. Nick came up with a clever plan and started work almost immediately after I signed the contract. Their work was extremely neat and they definitely didn't skimp on materials. I watched closely and nothing used was a cheaper/lesser product. Their billing, permitting and PG&E PTO process are very streamlined and my system was permitted, PTO'd and generating energy very quickly. There were some hiccups with the system initially, but they stood by their work and got it diagnosed. It ended up being a faulty Tesla component. The system now works as designed and is generating what I expected. read more

Green Air came to my house for the first time. Isaiah and Ben were punctual, extremely thorough in their work and very neat and tidy. Isaiah gave me quotes for batteries to store solar energy. They cleaned the solar panels and gave recommendations for some additional work. It was a pleasure having them here and look forward to an ongoing service relationship with this company. read more

Great workers. Easy to work with and be around. They were a li late getting started, but finished in good time. They really knew what they were doing. read more

these people are great! I've used them three times to expand the number of solar panels and back up batteries at my home. They are easy to work with, get things done as promised and do high quality work. I highly recommend them. read more