Best Heating & Air Conditioning / HVAC In Irvine

“I had an excellent experience with Alex. He was very responsive and great to work with. He is honest and does quality work. Highly recommend.“

“Awesome service .. Behshad came in and fixed the issue with our AC unit in no time and the charges were much lower than the competition!!!! 5 star service“

“I had such a wonderful experience Chris was such a sweetheart, very professional, on time, clean, I highly recommend him and would refer him to all my friends! Thank you Chris it was a pleasure meeting you and doing business with you!“

“This is my second time using AAD cleaning and after they leave I’m always so grateful they have come. They walk me through everything, show me the good and the bad and they do a thorough job. I love that they use a HEPA filter and they put pads down around their work. They are friendly and prompt. Highly recommend!“

“Called ARA after our AC stopped blowing cold air in the middle of a heat wave. They rearranged the schedule to come out first thing the next morning and got it fixed immediately. Super kind & communicative. Highly recommend“

“Ben came out right away and diagnosed the problem. My air conditioning was fixed in 10 minutes. Thank you Ben for prompt, professional service.“

“The installation was superb. There were at least 5 techs working. One of the heat pumps was operational by the evening. The next day 3 techs finished the installation and gave me instructions.“

“Technician Stanley did the great job repairing my heating system. He was very knowledgeable and professional. I highly recommend his services.“

“Nurbol was very helpful and explained the issues as he was fixing them. His service was quick and arrived on time. Gave us tue rundown of everything thatvwas being charged with no hidden fees. Very happy with their serivce and definitely recommend them.“

“My heat pump was installed several years ago. 3 days ago it stopped working so I call them and now it's working fine.“

“We met Avi when he was servicing our neighbor across the street. He kindly came and evaluated our unit in the middle of the night and gave us an honest answer, a simple change of filter could solve our problem. This is the most honest, well experienced (over 22 years) company I have come across. Highly recommend !“

“Diamond Air exceeded every expectation. We reached out after noticing our heating system wasn’t performing well—and with kids in the house, comfort is a big deal for us. From the very first interaction, the team was responsive, professional, and incredibly knowledgeable.

They took the time to assess not just the unit but our entire system, and explained the issues in a way that made total sense. What really stood out was how much they cared—about doing quality work, about our budget, and about making sure we were truly comfortable with the decisions we made.

We ended up going with a system upgrade, and I can’t tell you how much it’s changed our day-to-day. Every room in the house feels just right now—no more constantly adjusting the thermostat or piling on blankets. It’s made our home feel so much better, especially during cold nights and hot afternoons.

They showed up on time, cleaned up after themselves, and finished ahead of schedule. You can tell this is a team that values integrity and customer satisfaction above all.

Highly recommend Diamond Air to anyone looking for HVAC work done right the first time. Local, honest, and truly the best in the business.“

“Rescue O.C. Plumbing, Heating & A.C. Repairs to the rescue! When my air conditioning decided to take a vacation in the middle of summer, these heroes came to my aid. They swiftly fixed my A.C., bringing back the cool breeze that I desperately needed. If you're in need of some serious A.C. repair magic, look no further than Rescue O.C. Plumbing, Heating & A.C. Repairs—they'll save the day and your sweat glands!“

“Excellent craftsmanship! They repaired my HVAC duct and vent with precision. Trustworthy experts in heating system repair.“

“I don’t normally write a review unless the service was outstanding and a cut above. Hi-Tek Mechanical exemplified this with our AC replacement. Brandon and Christian (and 2 other techs) showed up early, were very conscientious of keeping the area clean and explained next steps throughout the process. The 2 other techs were equally as polite and knowledgeable. I also want to commend Dan for being honest, very punctual on responding, and always giving a great explanation on works best for me. I highly recommend this company and will continue to refer them every chance I can. Great work Hi-Tek!“

“I had a fantastic experience with this HVAC contractor. Their knowledge and commitment to quality work were evident from the moment they arrived, and I was thoroughly impressed with the results.“

“Fantastic service! I received a call back right away and Airstream came through again. This is the second time we have use Airstream for two unrelated issues, and both times have been great experiences. They provided quick, reliable, and reasonably priced services and I highly recommend them!“

“Mayo Mechanical recently installed a new AC system in my home. The people exceeded my family’s expectations for kindness and respect. They were on time and met our budget constraints. We highly recommend Mayo for HVAC systems and service.“

“I've been using Mark’s Heating & Air Conditioning for years. Just had a new AC/Heating unit installed and a new thermostat. Same day service from the purchasing to the installation. Their technicians are great and I wouldn't consider using any other company but Mark’s Heating & Air Conditioning!“

“Called them for replacing the blower motor of my kitchen aid hood. Paul and Brian got it done in just under 2 hrs. Very nice guys. Will recommend.“

“Tech John from A-1 Air Conditioning & Heating arrived early in the am (which I was happy about) to check out my A/C unit. He was very personable and knowledgeable. He checked inside the house first, and I had to open the bedroom door and out came my dogs. I had put them in the bedroom so they would not be in John's way. It turned out John is some kind of a dog whisperer as both dogs were very taken with him. Really appreciated that John was ok with the dogs out of the bedroom.Tech did a thorough job. I signed up for the Legacy membership plan to get twice yearly checks. It is not expensive and definitely worth knowing the condition of your unit. When the times arrives, I will get my new unit through A-1 Air Conditioning & Heating“

“I had a great experience! Everything was handled efficiently. I would recommend them.“

“Answer calls, friendly, knowledgeable customer service. Email of Appointment and reminders. Service Plan. Prompt. Kind, Respectful and knowledge of products and service.“

“I spent quite some time going through my options for toilet installation. I ultimately fell on this company to handle the job because of their good reputation. That reputation was proven to be truly deserved! Derek did an amazing job, absolutely 0 flaws in his work. He took his time but still managed to be quick and efficient. He informatively guided me through the different features of the toilet. Overall, great experience and amazing job.“

“Crew to replace our Air Conditioning units were VERY polite, answered our questions, did a great job including being very clean about everything inside the house/attic as well.“