HVAC reviews in Stockton, California

My technician was highly knowledgeable about the issue and completed the repair in a timely manner. He took the time to clearly explain the different maintenance plan options, including their pros and cons, which allowed me to make a well-informed decision about which plan to enroll in.

This company is great! After being told by another company during a routine ac and furnace tune up that both their motors were leaking oil I contacted my home warranty company, American Home Shield (also great) and explained what was going on and they arranged for Sierra Delta Mechanical to come to my home and check things out. From my initial contact with their office when they called to set, and then later confirm the appointment, all the way through the technician coming today the employees were great! Our technician Henry arrived on time, he was very respectful of my home, he spent a lot of time looking at both the ac and furnace and explained in detail what he saw. He gave me a lot of useful i formation that I plan to pass on to people in my retiree group. I would 100% recommend using this company, and i feel like Henry was very knowledgeable in his craft and I he has definitely put my mind at ease. Thank you!!

Kathy K.

I’d like to Thank Delta Sierra Mechanical for getting my heater fixed. Aaron, their technician was friendly and knowledgeable. He answered all my questions and I was very happy with the service he provided. I would highly recommend.

This company did a fantastic job in assessing the challenges with my HVAC system. They also provided many options to improve the system. The installation and cleanup was done, efficiently, professionally, and I would definitely trust them in the future. I was very impressed.

I contacted Delta Sierra Mechanical with a concern and they scheduled me right away. The technician arrived on time, fixed the issue quickly, and was extremely professional and courteous. He even wore booties to protect my home. Excellent service. I’d give 10 stars if I could.

I had a new AC/Furnace unit installed. They did such a fantastic job. I just wanted to give a special thanks to Mike the owner who worked with me throughout the project. The Gentleman that were at my house doing the install did a fantastic job. One name stands out above the rest and that name is Brandon. If you do have to get a new system installed you absolutely want him out there.

Thank you To "Team Delta Sierra Mechanical".

Back in April I placed a call to my home warranty company because my AC unit would not turn on at all. Delta Sierra Mechanical was selected as the service provider. They responded quickly and Renell did an excellent job of dispatching a technician and keeping me updated throughout the process.
Aaron the technician that was sent out was very thorough in diagnosing the problem. He determined that a new air handler motor was needed and promptly placed an order for a new motor. After the motor was replaced, it was working well but did seem a little louder than the original motor. I called Delta Sierra Mechanical and asked if they could send Aaron out again to check the motor. They were happy to dispatch Aaron out again.
Aaron checked the motor and agreed that it seemed loud so he ordered a replacement at no additional charge. Once the motor arrived Aaron was dispatched out again to install it. This second motor was much quieter after installation.
The communication and service that I received from Delta Sierra Mechanical was excellent. They are very professional and polite. Aaron the technician and Renell at the front desk did a great job! I am very pleased overall and highly recommend them for any of your HVAC service needs.

Great customer service from beginning to end! Knowledgeable techs that explained everything process. Both were professional throughout.
I recommend the company and service.

The Technician Aaron Ramirez was very professional and knowledgeable. He explained everything that was the issue with the A/C unit. He offered advice on what type of filters I can use and offered information about duct cleaning which we are interested in doing in the future. It was a great experience.

They were actually able to come very quickly and get our heater up and running very quickly. The technician was very professional. Really appreciate they took care of the issue so quickly as the heater heats my 82 year old mother in laws home.

The guys were super nice. Worked so quickly. Definitely recommend to our friends and neighbors.

Henry came out first and made the noice bearable until the parts were ordered. They came in two days later and Aaron came out and finished the job. Both of them were efficient and answered all of my questions.They also wore a mask and gloves since I fighting cancer. I am very satisfied with every aspect of their work and my heater runs very quiet again. Thank you so much.

Adrian was very professional and explained everything about what he found out. Very courteous and friendly. The woman that called to set up the appointment was also very personable. She was very understanding as I was working when she called. So far overall I have had a wonderful experience.

Delta Sierra Mechanical (Chris) came out for an inspection of my HVAC unit, and confirmed it was a hazard. He provided me with various options for replacements. I’m glad I chose Delta Sierra. The communication from beginning to end was seamless. Mike gave me a great price on a new system. The installation went great and I have heat again!!

They cleaned up everything and left no garbage behind.

Thanks Delta Sierra Mechanical!

I had another great experience with Chris Buethe from Delta Sierra Mechanical! This is the second time Chris has serviced my HVAC system. Last year, he came out to replace a capacitor, and this year he provided excellent service again.

Chris is always polite, friendly, and professional. He takes the time to explain what’s going on with my HVAC system and educates me about how everything works. I truly appreciate that he doesn’t just fix the issue, he provides solutions and makes sure I understand how to prevent future problems.

It’s reassuring to work with someone so knowledgeable and trustworthy. I highly recommend Chris and Delta Sierra Mechanical for HVAC service!

The crew was on time, professional, and they finished before dinner, which I was impressed, great service and a great deal, highly recommend the Delta Sierra crew 👍🏼

The service tech Henry, replaced my thermostat and reset the system so I could resume controlling my system via the app. He also suggested purchasing the HVAC twice yearly maintenance plan which was money well spent. This was my first time having my system serviced by Delta Sierra Mechanical, and I am EXTREMELY pleased and would HIGHLY recommend them.
1/26/26
I just found out I never posted the above comments regarding Henry. His work was performed in 2025.
Today 1/26/26, I had to call Delta Sierra again for a different problem. Thank goodness Delta Sierra is an authorized company that AHS works with. My heater was not turning on and Delta Sierra sent out their tech Adrian. Adrian was FANTASTIC, and because of the POSITIVE, Professionslism from Adrian, I wasn’t surprised. Adrian found the problem and upon futther review, Adrian was very proactive in addressing another potential problem that could cause further damage. I even went so far to call Delta Sierra and asked Janet to relay my EXTREMELY Satisfied feelings to the office manager or the owner of the company. I am a VERY SATISFIED customer of Delta Sierra and would hope they would answer the next call if I needed service.
Delta Sierra trains their techs the right way AND it shows.
Steve Sale 1/26/26

Henry was amazing. He handled everything professionally And didn’t stop until we got the results we needed. Thank you, Henry for your amazing work. You deserve a raise. Great serviceman quality work highly recommend him.

The final inspection by the City of Stockton was today and the system that was installed by Delta Sierra Mechanical passed. There was never a doubt in my mind that it would not pass. The technicians took their time and installed the system properly and as neatly as possible. I am extremely happy with their work and attention to detail.

Very helpful nd got our air going in this heat, my mom on oxygen nd it's hard for her to breathe in this heat over 103 out. Everyone at this company was very nice nd helpful, will call this company for any repairs we need done. I do recommend highly

I called JB Air when my AC went out and they came out the same day and fixed my AC . Jeff was very knowledgeable and professional. I would recommend JB Air for all your AC needs