HVAC reviews in Ontario, California

Anthony came out and was a Great guy. His price and service was outstanding. His installers Aldo and Will were very professional and knowledgeable about their work.
I highly recommend Diamond Air Services for your heating and air.

Mike came out to check out my ac. He was on time, friendly and knowledgeable about the system I have. He answered all my questions and recommended I do somethings that could help out keeping my place cooler. He showed me where and how to replace my filter. I recommend Mike and Diamond Air Services to everyone. I will definitely use them again in the future if needed.

Diamond Air has always been quick to respond and their techs always do a great job troubleshooting the problem with my HVAC and AC Condensers. I have used them for 3+ years now and will continue to recommend them to friends and family within their service area!

Anthony and his team were awesome from start to finish. Upfront pricing that beat out multiple competitors and no pressure on sales. Communication was excellent. The crew who came to install 2 complete hvac units were professional and friendly. They kept my house clean with drop cloths and picked up afterwards. Would highly recommend Diamond Air and use them again the future.

My HVAC unit is pretty old and wasn’t really functioning properly, 30+ years old and so I needed an honest opinion if it was time to upgrade. Called up Diamond Air services to check it out and spoke to Anthony to set up a schedule, Joey showed up and diagnosed the whole unit and gave me an intelligent honest opinion. We decided to upgrade and Anthony gave me a thorough breakdown on how the process goes. Scheduled the week after for install and would take 2 days. On the day of install the crew showed up, Bobby, Mike, I believe (Sean and Carl? And another person) I’m sorry if I didn’t remember the names correctly. They were courteous, efficient, and fast. One crew worked outside on the AC and another in the attic for the heater/duct work. They were done on time and did an awesome job. The AC was finally blowing nice cool air all over the house, It felt great. There was a slight issue with the heater fuse and primary drain being clogged, so they rescheduled to come back and fix it. Joey showed up to do the fuse install and fixed the main drain clogged and everything is now working properly. Overall Diamond Air services did an excellent job and I would definitely use their service again. If you ever need help, Anthony is the person to call. Thank you Diamond Air Service for the awesome job!!
Edit: update, still had issues with the AC primary/secondary drainage and Mac did an awesome job diagnosing and fixing the problem.

We had Diamond Air Service install our carrier in 2021, and recently, the fan outside our house stopped spinning. I texted Anthony this morning, and he replied instantly. Within an hour, he sent two technicians to fix it. Everything is now working perfectly. I’m very happy with their fast and efficient customer service!

Diamond Air Services deserved more than 5 stars review! Service call a couple days ago for furnace issue. Anthony M. immediately scheduled one of the technicians, Mac to come out to inspect the unit on the next day. Mac was very knowledgeable, courteous, and punctual. After diagnosed, a new part was needed. New part arrived a couple days later and new appointment was scheduled. Mac and Will came out to repair the unit in a just a couple hours. Their service was efficient. My furnace is back on running. I'm extremely satisfied. Yay.... :) Great company with excellent staff from Anthony, Mac, Tiffany and Will. What's a good team. Last but not least, it was very reasonable price. Thank you so much for your service and will definitely recommend to friends and family. Excellent Experience.

Jose arrived on time, diagnosed the issue, and replaced a part. My heater is working beautifully. Jose also took the time to go over the thermostat. Great job! I'm very satisfied with Diamond Air!

Our furnace died a few days before Christmas--the worst timing ever! I saw how good the reviews were for Diamond Air Services, so I gave them a call. Anthony was here within the hour, I had an estimate that day, and we were getting a new heating system installed within a few days. Excellent price, superb customer service, he's on-time and communicates, and his team was spectacular, clean, and professional. We could NOT have asked for anything else. Thank you, Diamond! We have found our forever service provider in you!

Diamond Air personnel were very professional led by Anthony M. We had our whole AC unit replaced including all the filters, thermostats and duct cleaning done. Anthony M was very prompt in coming to our house and emailed us an estimate an hour after he left our house. He was again very professional and prompt when we decided to use their service a few weeks later. The whole crew came in and installed our new AC unit in one day. They were very meticulous in what they do and never rushed in installing the unit and the filters. We would highly recommend Diamond Air.

Household AC was nonfunctional for a week--Diamond Air sent a technician out the next day after I called who fixed things up in a flash. Special thanks to Jose, thank you for the expertise and the advice!

Very quick and professional service! Oscar represents the company with such professionalism. He is kind and took his time in fixing the problem. I was very impressed with him. I would recommend this company to everyone looking for a job well done.

We been working with Howie from Diamond air service for more than 2 years. All work done was superior! Fair price, compared to other companies. We are very happy with them. We used them for yearly maintenance services, and repairs. We are so grateful for them.
Thank you team Diamond!

Mike was great helping me out with my ac thermostat setup. He walked me through all the app setup as well and showed me where to find phone numbers in case I need to contact Diamond Air for questions. A great experience from the appointment making to the final installment!

Jose and Oscar B from Diamond Air Services did an amazing job figuring out what was really wrong with my HVAC unit . They showed up on time and were really polite and patient with all my questions and concerns . They did a thorough scan of my unit and changed out a bad capacitor , and even tightened up some loose cables so ran much quieter . I'll be coming back to Diamond Air for all my future needs. Thank you again!

Mac did a great job with our service. Again another great job and another great company. Thanks Anthony and Mac for a 5 star service. Highly recommend this company!!

I had a great experience with Diamond Air Service. They were very punctual and did a fantastic job. I had my supply and return plenums replaced in my attic along with cleaning the whole component, and I had all my air ducts cleaned out. They were also very reasonably priced compared to another HVAC company that quoted me. It cost me roughly a little over $5K through Diamond Air. There was an issue with a vent being built into the crown molding of my house, but they were able to get it taken care of for me at a later time. Overall, I'd definitely recommend Diamond Air Services for your HVAC needs.

Baran and Christian did a great job cleaning the air ducts and dryer vent. Definitely recommended. Near and clean.

This was a requested Annual Maintenance Check Up.
Diamond Air sent a photo of my technician when he was on his way. He arrived on time. Worked quickly & professionally. Check in the attic and our outdoor AC. Also check the air filter and replace it.

Had them do complete Heater, condenser and coil about 6 years ago. They did an amazing job. They have three crews. Everything is still working great, however a few months after the installation I noticed a digital lazer level I kept by the back garage door was missing. I figured one of the workers had taken it. Then about a year ago I was looking for my Bosch recipical saw and it was missing. I haven't had any other workers in my garage. A few months ago I went to use my airless sprayer. I have always had 100 feet of hose and a swivel near the gun. 50 ft was missing and the swivel. The level was $50.00, the saw was $129.00 and the hose is $69.00, the swivel is about $40.00 now. Altogether that's $300.00
worth of tools missing from my garage. Diamond Air are the only ones that have been in my house or garage. I have always praised their work, but I can only assume that my missing tools were taken by one or more of their employees. If anyone wants to use their company, I would watch them constantly. Their equipment and installaton are amazing, but it is sad when you have employees stealing from your customers. Had given 5 stars, but had to reduce that to 3 stars due to employee theft. Anthony was great!

Friendly and responsive service. We had our HVAC system cleaned after concerns about ash running through the system after the January fires. We have several units, it took 3 people about 6 hours to thoroughly clean everything and inspect all the units for any necessary repairs. I will definitely use them in the future.