I had a great experience with Diamond Air Servcies. Their pricing was fair and affordable compared to other quotes I received, and their communication throughout the project was excellent. They kept me informed every step of the way and completed the work exactly when they said they would. Their commitment to customer service throughout, and after the job was finished, was excellent. We experienced an issue shortly after the installation, and when I contacted them, they came out the very next day and resolved it without any hassle. It's refreshing to work with a company that stands behind its work and responds quickly when a customer needs assistance. I highly recommend them to anyone looking for a reliable, honest, and professional HVAC contractor. Their workmanship, communication, and customer service exceeded my expectations. read more

So glad we went with Diamond Air for our new AC and Heating system. The owner Anthony was very detail oriented when he came out to give an estimate. He's a man of his word throughout the whole process. His estimate came in with the best and most efficient name brand system at the lowest price compared to our other 3 estimates. His crew did an amazing quality installation backed by a 5 yr labor warranty. Everyone on his crew was so nice and pleasant to work with, very knowledgeable and skilled, did a excellent job, cleaned up after themselves. Everything went smooth and great! Didn't get a photo of the Furnace because it's in our attic, but here's our fabulous AC unit! It's so quiet and lots of cold air! read more

Diamond Air Services - Carrier 18 seer AC unit - Air Duct Cleaning Near Me - Ontario, California

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Our facility has utilized Diamond AC to service multiple HVAC units for several years. Every technician assigned to our site has consistently demonstrated promptness, thoroughness, and exceptional technical expertise. Their upfront communication and absolute integrity make them a highly reliable partner for our operations. I highly recommend Diamond AC for any commercial or residential HVAC needs. read more

My old HVAC unit was old and the electric bill was crazy high. I was looking for a replacement and received a couple estimates for different options and brands. Among the options, Anthony did offer a good price for CARRIER - 4.0 TON 18 SEER VARIABLE SPEED HEAT PUMP AND MULTI STAGE FURNACE. I did a research about this particular unit and decided to go with it rather than going with other brands like AC Pro and Daikin where they asked for about the same price. Anthony also matched the 12 years warranty offer like Daikin. 24 months payment with 0 interest was also another good deal. The crew Jose, Ethan and Oscar showed up on time and completed the installation in one and a half day. The old unit was removed and platform was inspected before putting the new one in place.they also installed a new breaker box for safety. The finished looks a lot nicer than my 20 years old unit. Overall I'm happy with the service and can't wait to seeing how it gets us in summer. read more

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Wow! Salvador found that my Air Cond blower had died and needed to be replaced. Jose came with the new blower and installed it perfectly in 40 minutes. That has got to be a record. Both men are very good technicians; they thoroughly checked everything before leaving. Thank you Diamond Air, you are very impressive. read more

Today I had the pleasure of meeting Salvador from Diamond Air he was very professional and he checked everything on my ac and furnace he checks everything from top to bottom great service read more

We hired Diamond Air to install a whole house fan. Anthony provided our estimate at a good price and was very good with communicating with us about getting the equipment so we could schedule installation. When the team did the install they were thorough and efficient. The whole house fan is working great! read more

I had a problem with my AC. It wasn't working so we called diamond air. Very fast service. They arrived the same day. Very organized. They came when they said they would. Communication was great -took pictures and explained problems. No upsell. Great price. Technicians were nice and professional. Tested my ac to make sure it worked. Definitely will use them again! read more

Howie and his team did an excellent job installing our new heater and removing the old one. From consultation to installation to city inspection, everything was completed so quickly and efficiently. The entire process was smooth from start to finish. The price was very reasonable, and the service and communication were clear and easy throughout. They were professional, clean, and respectful of our home, making sure everything was tidy when the job was done. We also appreciated the helpful recommendations they provided. Highly recommend Howie and his team! read more

Anthony came out to help us with our air conditioning, and was absolutely amazing! He solved the issue very fast, and was so friendly. We had even asked if it's possible for him to come out a little bit earlier than our scheduled appointment the day of, and he was so accommodating. We will definitely be going with Diamond Air again next time if we have any heating or aircon issues. read more

Got them through Yelp and they responded within a 10 minutes and setup an early appointment. Oscar and Baran were on time and did an amazing job. Explain me the whole thing and provided me the discounted price. I am happy with their service and adding them for annual service. Thanks Oscar and Baran. read more

Absolutely phenomenal customer service, top notch quality, and very reasonable pricing! I got estimates from 4 reputable companies and Diamond Air's price was among the lowest quotes I received. More importantly, they totally surpassed my expectations in every way from the very beginning to the very end! I hired Diamond Air to install two new HVAC systems (one for my home's upstairs and one for my downstairs). The owner (Anthony) came out right away (and on time) to assess my needs and provide an estimate. He was very knowledgeable, professional, and extremely personable. He personally took care of every single detail, including managing his 4-person installation crew, stopping by my house every day on all 3 days of the installation to ensure every detail was perfect, going to the store to buy brand new air filters for me (and even gave me some extras), doing a final walk-through with me to ensure I was COMPLETELY satisfied, arranging for the testing and inspection, etc. He provided sound, experienced advice throughout the process. He noticed that there was some minor damage to the drywall along the rim of the attic opening, which was unavoidable bc they had to remove the trim around the opening to be able to fit the new equipment through the hole up into the attic. So, he promptly brought this to my attention and hired (at his own expense) a great drywall repair guy who came right away to fix everything perfectly (textured and painted to match existing ceiling). It looks better than before! Anthony checked in with me frequently throughout the installation to make sure I was satisfied in every way. And I am!!!! read more

My HVAC wasn't turning on. I called Diamond Air. I was able to have them come out next day. Sal was on time. He was able to find the problem and repair it. I was very happy with the price. I will definitely call them again. read more

These guys were lifesavers! My elderly mom's HVAC system went kaput and I had to oversee the overhaul from across the country. I was anxious about it obviously, and Anthony went the extra mile to set me at ease. The entire team was so considerate and kind, while remaining professional. I also appreciated how respectful they were e.g., when I asked questions. No one was patronizing or impatient. Manners aside, I vetted 3 companies; Diamond Air was a good mix of the benefits that come with larger corporations (licensed, detailed paperwork, dialed-down process) but with the feel of of a small, family-owned business. Price was extremely competitive, with extras in the contract that weren't offered by the other folks. I wanted Carrier (v. Lennox) which I think requires a quota to be filled in CA so some businesses don't offer them. There were no problems w/ Diamond Air b/c I guess they're a factory-authorized dealer. There were no surprises in the end, price was all-in once I signed. They were also: responsive/clear in communication, quote/contract was easy to understand, they sent photos for everything. I'm a little OCD so I loved that. Anthony runs a tight ship! Even the receptionist, Tiffany, was well-informed and able to answer initial questions about process. OK, what else...they just did a great job, cleaned up after they wrapped, paid attention to details...honest, nice folks who know what they're doing. They really took good care of us. Thank you team!! read more

If 10 stars were an option, this company would earn every star. From the first call to the last day of service, the staff was professional, respectful and always communicating regarding the step by step job process. Also, they covered up my hallway to help keep it clean since they were installing new ducts in the attic. I want to commend the staff that installed a top notch AC/Heat system and also gave us the utmost respect and professionalism. Huge thank you to Anthony, Jose, Oscar D, Christian, Ethan and Edwin. A first impression of a company is the best marketing, and I will definitely tell my acquaintances and family about Diamond Air Services. read more

Thanks Anthony it was a pleasure see you .Beyond expectation and valuable information

"Pretty good overall experience. The quality is solid, the service is great, and the pricing is even better. I did my research and compared at least three different companies. Some of them felt very sales-driven, but Diamond Air stood out as more professional. Whenever I asked about things like air scrubbers or humidifiers for the HVAC system, they were always able to give clear and knowledgeable advice. Unlike some companies that don't even understand what you're asking and just try to push a sale. read more

Mike, Anthony and his team were very professional from the start, they did an amazing job installing my Carrier seers 18 ductless AC. I was very impressed how quiet the unit was even when standing and talking next to it. I don't do review, but this business deserved a 5 stars & definitely will refer more people to them. Thanks guys! read more

This is my third 5-star review for Diamond Air -- and for good reason! Bobby came through again today. None of us ever want HVAC issues, but when they happen, you hope you have someone reliable to call. Bobby is that guy. He arrived right on schedule, quickly diagnosed the problem, fixed it efficiently, cleaned the unit, and even took the time to explain how the AC system works. That kind of professionalism and care is rare. Trust me -- Bobby is the person you want to save in your contacts for any HVAC needs. Thank you, Diamond Air, and a big thanks to Bobby! read more

Another 5 Star review for Diamond Air from us! We had them install our AC/ heating and they did an excellent job. We recently had an issue with our AC and they were fantastic. Howie assisted us and he was absolutely wonderful - quick to respond, communicated well and addressed the issue immediately. We couldn't have asked for a better experience. Their work was excellent and done in a timely and efficient manner. We would recommend them for a new install or repairs. This is one of the best companies we've done business with. Honest, reliable and fair prices with a great group of employees. Thank you! read more

Bringing the saying, "I know a guy" to a whole new level! I have used Diamond Air on 3 separate homes, and I am always extremely happy with the service, final product, and last, but not least PRICING. I have recommended this company to many friends, and everyone has also been very satisfied. Service (10/10) I would rate higher if I could! I have been working with Anthony for a decade, and the level of customer service has always been excellent on each and every experience. He has been very professional, responsive, friendly, down to Earth, and great at explaining the process. The team that came out to install our AC unit were all very polite, put shoe covers on without even being asked, and were very friendly. Product (10/10) Diamond Air uses high quality products, does great work, and goes above and beyond with even the small details. The first AC unit they installed for me in 2014 is still going strong with no issues at all over the years. This was a complicated job; no one in my condo complex had central AC because of the difficulty of the project with no attic. They problem solved and everything went great. The mini split AC unit they recently installed has been great as well. The project was a little complicated because it was installed on the second floor, but they did great work. Wires were hidden, and the finished product was super clean. They even added a little sticker that I loved (my nickname), such a nice touch. Very happy with all of the work they have done. Cost/Value (10/10) Value for service and product is great! Anthony actually recommended that I get other quotes, and it made me appreciate Diamond Air that much more. I've had quotes from other companies come at thousands higher, and they were not even offering to do the same work or same brand level of product. I have always been extremely happy with their price point. Definitely recommend Diamond Air Services. Once you use them, you'll tell any of your friends with AC needs that, "I know a guy." ;-) Tip: They do not jack up their prices in the summer like most companies do, but they do get crazy busy during that time, so I highly recommend getting the work done in the off season like fall or winter. read more

I cannot say enough about Anthony and Diamond Air Services. I called after I received a ridiculously high quote from AC Plus Heating and Air. Our home was built in 2021 and they attempted to charge us $7,000 for a full deep clean and UV light installation. When I asked about only a deep cleaning they said it would cost over $3,000 and that wouldn't include sanitizing. I called Diamond Air to get a second opinion and Anthony offered to come to our home and check it out before scheduling a cleaning. He estimated that a full deep cleaning including sanitizing would be no more than $1,500. However when he arrived and examined our house he said that our unit looked brand new and our ducts were clean. he gave advice on how to change the filters and explained that the main one looked dirty because it was near the laundry room. Such a difference from being told spores were flying through my home! I will trust Anthony for any and all AC/duct related issues from now on! A bonus was how sweet he was to my kids while he was in our house. Thank you for your clarity and honesty. read more

I have used Diamond Air a few times now. I highly recommend this company for your HVAC needs. Anthony was very honest and has the best customer service! I will definitely seek their services in the future! read more

Reading all the positive 5 start reviews, I knew I would contact Diamond Air Services to troubleshoot and hopefully fix my initial issues. After the assessment, it was diagnosed that it'd be better in the long run to get a new system due the continued issues and age of the equipment. Of course getting the initial estimate was an eye opening cost experience that comes along with being a home owner. Anthony really took the time to explain options and put any doubts at ease. Aside from the initial contract, Anthony went above and beyond to take care of me as a customer and not just a seal-the-deal feel and on to the next. The team was able to start a few days after, during the week of high temps. We were extremely appreciative to finally get a good cold night sleep with the new upstairs system. The Monday after, the team finished the downstairs unit and during the next few days also cleaned the air ducts and installed new air filter return grills. Diamond definitely had a great scheduling system. Every individual team member that worked at our home, was punctual on the appointments arrival time and even more was their professionalism in explaining and answering all my questions. Diamond and their team are truly the best out there. At first i was skeptical on 5 stars with 450+ reviews. But now I'm also one of these positive reviewers and will be a life long customer. Thanks again Tiffany, Oscar, Brendon, Jose, Christian and Baran. read more

Diamond Air has installed new heating and air conditioning in our home over the years and has always been our go to for any service needed. Their service people are on-time, professional and knowledgeable . When we called them recently because our heater wouldn't turn on, Diamond responded and quickly diagnosed and fixed the problem. There are many HVAC service choices out there, but we will continue to call Diamond Air. read more

Prompt, honest, reasonable and didn't up sell their estimates. We are elderly and felt very comfortable. Everything was fully explained.

I was looking for an HVAC company to come and replace my old outdated equipment, after interviewing multiple companies. I settled on Diamond Air Services. Diamond Air was extremely professional, they installed the equipment without any issues and when above and beyond what I expected. The crew that removed and installed was productive every minute they were here, Jose the lead on the team was always on site and answered every question I had. I would definitely recommend this company to every family member. read more

Amazing service! Tiffany was very friendly she answered all my questions when scheduling an appointment. Oscar the tech was very kind. He explained every step of the process, the diagnostic test results etc. So relieved when Oscar found the problem real quick. Replaced my capacitor and had this unit running better than ever before and under 30min. Price was very reasonable. Would highly recommend. I called Friday and had my appointment Monday morning. So glad I waited and went with Diamond Air. read more

Hired Diamond Air for a large job that included asbestos abatement, relocation of our system from the garage to the attic, installation of a new HVAC system/heat pump, installation of both an attic fan and a whole house fan, installation of an attic light, and replacement of attic access doors. Overall, the process was smooth and all installation services were completed within a week. They also completed the permit process and helped to schedule the inspections to ensure our new system was properly installed and up to code. Anthony, Mike, and Oscar stood out during this process -- they were very friendly and easy to work with. Anthony was very responsive to calls and texts, and he was amenable to our ideas and suggestions. Anthony also followed up after the installation was complete to ensure that we were satisfied with the work. Mike and Oscar were very diligent -- showing up early (around 8:30 am every day), cleaning up before leaving, and working hard the entire time they were here. It is not fun working in 90+ degree heat in the house and even less fun to work in 110+ degree heat in the attic, but Mike and Oscar spent hours working without any complaints or negative attitudes. Tiffany in the front office was also responsive and helpful. She helped with the permit paperwork and scheduled the inspections. When there was a miscommunication about the permit fee payment (I paid it myself after receiving an email about it, but Anthony told me they would cover the cost since it was included as part of the job they were hired for), Tiffany quickly issued a check to repay me for the expense that same day. She also kept us updated on the permit and inspection process. This was an expensive job, but it was comparable to some of the competitors we considered. We ultimately chose Diamond Air because Anthony made a good impression on us during the consultation, was accommodating to our requests, and was responsive and informative without making us feel pressured or forced. We would not hesitate to reach out to Diamond Air again in the future for HVAC issues. We had a great experience and would recommend them to others. read more

Amazing job by Will and Jose! Will and Jose came to clean my HVAC - Furnace Blower Motor and Wheel, and dryer vent. They came on time, were very courteous, and made us feel comfortable with the job they're doing. My husband and I had a couple questions about their cleaning process and the maintenance we need to do on our end, and they gave us their honest opinions--it didn't feel like they were trying to get us to pay for more services. What I truly appreciated were (1) they wore shoe covers and were diligent about taken them on and off as they came in and out of my house; (2) they showed us the before and after (in-person and pictures) of the areas and items they cleaned; and (3) they made sure that my A/C, heater, and thermostat are working. Tiffany was also great! Tiffany handled the appointment, answered my initial questions, and provided me a detailed breakdown of cost. I also appreciated the follow up a week and a day before the appointment. Thank you Will, Jose, and Tiffany! read more

I called Diamond Air for maintenance on my air conditioning unit and they sent a technician named Baran who was very professional and on time. Highly recommend and reasonably priced. read more

Honest service awesome people I would for sure call again for service everything checked out good others kept telling me I need a new ac when I never did read more

I am blown away with the customer service from Diamond Air Services. In 2020 we needed a new AC and furnace. We obtained multiple quotes but ended up going with Diamond Air Services. We never felt pressured during the quotation process and were given multiple options to fit our price point. On the day of installation everything went smoothly. The team was personable, knowledgeable, and conscientious. The house was clean when they left and everything worked as expected. A+. In 2024 we needed help adjusting the AC air flow to some of the hotter rooms in the house. Again we called Diamond Air and they came out and did the adjustment for free! A+. Fast forward to 2025, the furnace wouldn't turn on. Ofcourse we called diamond air again. Will (who was Amazing!) came out and replaced the blower motor. Parts and labor for the repair were covered under warranty! WOW! A+. We have had nothing but great experiences working with Diamond Air. Seriously, their 5 star yelp rating is well deserved. I cannot imagine using any other company for our family's heating and cooling needs future. Great work! read more

Excellent and professional service!! Call in the early morning and have the service in the afternoon. My technician Mr. Jose came in on time, he is very patiently to explain the problem and fixed. Great, great job! P.S. Diamond Air staffs are very helpful, friendly, and professional. Thank you very much and you all deserve read more

I chose Diamond Air out of 4 to 5 quotes, from smaller company to large one who works with local wholesale club, to install a new HVAC system. Anthony came in for a quick consultation on Saturday morning. He was very straight forward, no wasting of time, no upselling, no non-sense. I received the quote on the following Monday. Tiffany, with her excellent customer service skills in the office, glided me through scheduling, tax credit and rebate, and payment. I could always reach her on my first call, and she could answer my questions right away or found me the answers promptly. She also replied to my email fast and did her best to accommodate my schedule. Installation team also did a clean and good job. Their pricing is competitive, and the customer service is very good. Getting a new HVAC is really a hassle; Diamond Air make the process easier for me. read more

Baran and Christian cleaned our air ducts for us. They arrived on time and finished quickly. One of our plugs seemed to have tripped due to their equipment but they made sure to check in with me the day after and even a few days later to ask whether it was fixed or working again which I appreciated. Would definitely work with them again read more

Thank you Diamond Air! Called them and was able to schedule an appointment same day during the 90 degree day. The service technician that came out was quick to diagnose the issue. Thank you Diamond Air! read more

Excellent Installation, Excellent equipment, excellent price. Highly recommend Diamond Air. Anthony and his crews get it done right!

We had a great experience working with this company. Our technicians Baron and Christian were great. They were on time and extremely thorough with their explanations of the work being done. read more

First time get my air duct clean. Great work Diamond Air!! Baran and Oscar are very professional. They work fast and detailed. They answered all the question I have. Thank you read more