We had a great visit from Chris B. and he found that Bell Brothers service tech turned off our gas line to our heater of our HVAC. Bell Brothers tech stated our heaters gas valve was completely broken and then tried upselling us a quote of $32,000 for a new unit. I'm so glad that Chris found the issue and saved us tens of thousands of dollars. We're canceling our Bell Brothers service and going with Delta Sierra Mechanical! This is the second time that Delta Sierra Mechanical has come to fix something that Bell Brothers techs messed up. Thank you Chris for helping us out. read more

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". read more

Service was prompt, friendly and thorough . Needed service tuneup for HVAC system and all went well and thought highly of the service to enroll in service contract. Very satisfied with service and value for money read more

Since I started working with Delta Sierra Mechanic, the burden of maintaining and repairing the furnace and HVAC of my rental property has been lifted. They are so responsive, professional, punctual and friendly so the entire process is effortless. Shout out to Chris B.! He is a wonderful guy and knew exactly what was wrong with my furnace as I described the problem at my most recent appointment. He fixed it up so quick and carried on with the rest of the scheduled maintenance. He was so friendly and a pleasure to speak to. Thank you Chris! read more

Chris came out to do a standard maintenance on my home. I have a maintenance agreement with Delta Sierra Mechanical which is well worth it. Chris found out that the system was low on Freon and that would suggest there was a leak. Instead of going for the most expensive part to swap out and or suggest that it would require lots more money to diagnose an issue, he saw that it was just the little valve that allows for Freon to go in, but not come back out. We swap that out put in the extra 3.5 pounds of Freon in my system that holds 8+ pounds. He's very personable, professional and neat. Thank you, Delta Sierra Mechanical for your service. read more

I have been getting estimates to replace my 30 year old HVAC system. Chris gave me several options and took the time to explain each one. When I found out I could get a Lennox for such a fair price, I was sold. I am looking forward to my install date next week! read more

My AC wasn't working and Chris came out to take a look at it and see if he could fix it. I am happy to say we now have cool AC. Chris was very helpful and honest and explained everything that was going on with it. They were sent through my home warranty company but I recommend you give them a call if you have issues. read more

The absolute best and honest HVAC service I had received in over 20 years. Chris B., one of this Delta Sierra Mechanical's HVAC technicians arrived on time and treated me like family. He remained PROFESSIONAL, HONEST, and TRANSPARENT and saved me thousands of dollars guaranteed. I have been a long-term customer (over 6+ years) with Bell Brothers Heating and Air and I can't count how many times Bell Brothers Technicians would inform me of multipe issues with my HVAC system and provided me quotes every time in the range of $8,000-$11,000 each time a service visit occured. Additionally, for the past few years, their technicians continued to strongly recommend I replace my HVAC system, totalling just shy of $32,000 at every visit. In a nutshell, every time I received a pricey quote from Bell Brothers totalling thousands of dollars, I would request Delta Sierra to evaluate my HVAC issues brought up by Bell Brothers and provide me a second quote and.... EVERY SINGLE TIME...I found that Bell Brothers had been lying to me all this time. I dropped Bell Brothers today and signed up with Delta Sierra's HVAC Diamond Plan (which is substantially cheaper than Bell Brothers-and with much better perks). My only regret is that I didn't drop Bell Brothers and made the Jump to Delta Sierra Mechanical years ago for all my HVAC needs. Chris B's honesty, integrity, transparency, kindness, and Professionalism really shows how this company is truly based on Trust and Ethics at its core. Thank you Chris and thank you Delta Sierra for everything. If you wish to see what Bell Brothers had done to me within this past week, please look at my detailed objective review of them to provide you with the background to this review and jump over to Sierra Delta as my new HVAC PRO's. read more

I had Mike from Delta Sierra Mechanical come out to my home to do an estimate on replacement. Our air conditioner was original to the home and we wanted something more efficient. They put a new high efficiency heat pump air conditioning system. The installation crew was fabulous very respectful. Did a great job. Thank you Delta Sierra Mechanical for a great experience. read more

godd and friendly technician thanks Chriss He is very knowledgeable of what he does and fix the problem with our unit read more

These guys are awesome!! I had called them at 9am on a Sunday to report that I was noticing a leak of dripping water and in just 2 hours Chris came out and assessed the leak. He explained what the issue was and how it may have occurred. After Chris got my approval, he quickly resolved the issue. Chris was very professional and I was very happy with his service. Additionally, he recommend a regular service membership that I signed up for. Chris and these folks are great people. Thanks Zamary read more

Very impressed with the service tech, Chris. He solved our A/C issue quickly and gave us valuable information about an air scrubber. It will likely solve breathing issues. Overall we're very satisfied with the service. read more

A team was here in Rio Vista today to do a total replacement on a system. They were absolutely amazing, helpful and respectful. My aunt had a better understanding of her system when they left and how to run it. They made sure to clean up any mess that was made and again super informative. read more

They arrived on time diagnosed and fixed the problem on the first service call. I highly recommend them.

We have been without a working AC for about a month and a half. Our Home Warranty sent out a company whose tech spent 10 minutes diagnosing AND "repairing" our issue. 5 minutes later it was not working again. Company sent the same guy out to repair, and again, he had not yet fixed the issue. Being that it's heating up soon, I took matters into my own hands and searched for a company that could come out to help. I found Delta Sierra. Upon calling yesterday, I was so excited when I was offered a next day appointment. I also really liked that I received an email and text confirmation of my booked appointment. Today, Chris came out, and after giving our recent history of work done to the unit, Chris did a thorough check of our systems, and gave his recommendation for the scope of work that would need to be completed to get our AC cool again. Additionally, he suggested their Maintenance Plan which I gladly signed up for, being that it has many benefits for us as homeowners. Chris was knowledgeable, kind, and respectful of our home. I feel confident about working with this company in the future for all of our repair and maintenance needs. So refreshing to find a company that is honest and truly wants to help. Thanks again ! read more

I've been struggling with a 20 year old HVAC system for several months. Delta Sierra was my 3rd try at getting help. They really do save the best for last. I was helped by Henry and then Chris B. Both came when they said they would, took their time to explain what was happening and what they were doing to address the issues and answered every question that came their way. Thank you both for your patience and your hard work! read more

Chris Buethe came within the time window given. He was very professional, polite, and knowledgeable. He was able to fix my ac within less than 30 minutes. He suggested getting maintenance 2x a year for my hvac system and gave me their flyer. He was not pushy for me to buy anything. I would highly recommend Delta Sierra Mechanical. read more

Jose was early for appointment to fix heating issue. Very affable and professional. Answered all questions and even went further answering questions about adding a/c . The owner was very helpful in offering to submit paperwork needed to add a/c to existing system. Would absolutely recommend this company ! Five stars just isn't enough!!!!!! read more

The service professionals were totally professional. They were on time, respectful of property, not to mention they did an amazing job of cleaning our air ducts. Totally recommend them. read more

Chris B came out today to give me a quote on a new gas wall furnace. He was very informative and professional me know about other potential options. read more

Our AC went out so we called Delta Sierra Mechanical. Michael woods came out and fixed our air conditioner but told us with it's age (21 years old) we needed a new one. We made a date for a new one to be put in. Four men came out and put in the new HVAC system. They were very personable and professional! We have had a few 100 degree plus days since then and it has been a blessing not to worry about out AC not working! I would definitely recommend them! read more

We called them and Michael Woods came out right away. He fixed the problem quickly with our AC. He explained that our AC and furnace needed to be replaced. They were both over 21 years old. We agreed to have Delta Sierra Mechanical do the work. Four men came out to do the work. They were all personable and professional. We had a new AC and furnace in one day. They also cleaned our ducts. I would definitely recommend them. We had piece of mind during these last few 100 plus degree days! Thank you! read more

I have AHS so they call out companies they are contracted with. Since 3/26/25 I have been out without A/C. The 1st tech Henry came out and said it wasn't hot enough to check the A/C. The second technician Aaron said it wasn't an A/C problem an Electrician needed to come check the breaker box. The electrician said it's not an electrical problem the A/C technician needs to come back out. It's nice to read people were helped with an hr or so when called. I found a technician to get a second opinion and found the wires were wired incorrectly causing the motor to go out and trip the breaker box. I called this company and told them what I found. I had to wait an additional 2 more days for a tech to come out late afternoon 2pm - 4pm. The receptionist said no technicians were available. She didn't care!! I told her I have a child who is on a ventilator. Yesterday one of my boys was getting sick because it was too hot in the house. I had to purchase fans to help cool down the house. I told AHS to never send this company to my house. They still have to come out and fix what they broke, ugh. read more

I found Delta Sierra Mechanical thru yelp, and they were able to come out and inspect the problem the next day. Chris was our technician, he was great, and he got right to work. He talked us through the repair/replace options and we decided on the fix. He was in and out in under an hour. Would recommend them again. read more

Called Delta Sierra Mechanical to fix my heater. Chris was the technician who came out in the morning to fix the problem. He was very thorough, figured out what the problem was and stayed until it was fixed. Would definitely recommend Chris and Delta Mechanical. read more

Currently having a bad experience. AC has been out for two weeks. They promised a repair quote over a week ago and they refuse to return phone calls. I can't get them on the line to solve the problem. I was forced to use them by my warranty company and so far, it has been a horrible experience. read more

Though it's fall weather, Stockton weather is well over 100 degrees and we needed someone to fix our a/c! Everyone else was booked or didn't return my calls. The admin at Delta Sierra Mechanical was nice over the phone and got a mechanic to come check out the problem. Our mechanic, Chris was our lifesaver and he was so punctual, friendly, and knowledgeable. We're so thankful for his honest work and kindness! If we ever need a/c repair, we now know who to call :) read more

Do not hire this company!!! Their service technician came out to my home on an insurance work order and was rude to my spouse and possibly damaged my air conditioning system to make money on repairs. After they realized parts may not be available cancelled my work order and stated it was due to my wife using profanity. Unbelievable and a lie. Now both them and my insurance company is at odds to what is the truth. Bottom line they dropped me with no regard to the customer. read more

Chris B. was very professional and knew his stuff. He figured out the issue very fast and fixed it very fast. Would highly recommend for anyone. Thanks so much read more

I called because my AC was not cooling the house! Mike the owner came out and inspected my unit and told me the problem and really took the time to explain I need a unit but he can fix part of my issue and buy me some time to get me and family through the hot season and start preparing financially for get a new AC unit. He really explain things in way I can understand and really gave me options to allow me to make an informed & educated decision that works for me. I know the leak my unit has is expensive to repair and my AC unit being 25 years it's time for a new one. This hot weather sucks so getting alternatives was great! He was professional, kind and respectful of my home by having proper shoe covers, gloves etc. The price I pay for my unit to get me through the hot season was affordable I will definitely be using his company when the times comes for the new unit to get installed! read more

Delta Sierra Mechanical - Heating & Air Conditioning/HVAC Near Me

Justin and Michael were the techs that installed my new ac unit and furnace. They were very polite, took the time to answer any questions that I may have and the work they did was outstanding. I would definitely recommend this company! Thanks guys. read more

Delta Sierra Mechanical (formerly Heating & AC Service Experts) to the rescue again! When I heard that the company I've previously given 5 star reviews had a new name, I wasn't sure what I'd get. Just as they said, same owner, same great people. I always get quick responses and knowledgeable repair persons. Jose arrived on time, within minutes diagnosed the problem and had the needed part in his truck. A short time later he had my furnace working again and even changed the filter for me! These guys have been here 4-5 times and I've never been disappointed. My home warranty company keeps wanting to assign a different contractor but I always insist on my first pick and I get them. read more

Installed a new hvac unit this summer. Works great and my pge bill is lower. I like that they are available 24/7. Professional and did a great job. Will continue to use their services...Trustworthy and reliable. read more

Called and spoke with Mike, the owner, on Thursday. He set me up for 9-11 Friday with Chris. Chris was on-time, knew what he was doing, was properly equipped, respected my property and was SO PLEASANT to deal with. Also, I received both a text and call to let me know when he was on his way. The ETA was spot-on. Can't say enough good things about this company and Chris. Price was fair. Service was thorough. Just call them, already!! read more

I read all the great reviews about how they fixed and didn't try to sell a new system. They came out and the guy said, you need a new system. Says he won't even try to fix this one. So many untrue words were used. Predatory practices. Had him scheduled for my business & my home. Canceled my home visit. Will NEVER call them again. read more

Our AC stopped cooling yesterday evening at 6:00. I searched yelp and found delta as they had outstanding reviews. After making contact the owner was able to get me on schedule with no pressure. They came within the time slot they had started with and when the tech came he was extremely knowledgeable and we were able to resolve the problem quickly and their pricing is extremely good. The Ab value of having a knowledgeable company that doesn't upsell you and want to help you answer questions and ensure you are pleased with the service. Please don't go anywhere else and reach out to Mike and team! read more

My heating was sometimes working for a few minutes but would turn off. My tech immediately found the problem and my heating was restored. He was timely and professional and 10/10 would hire again. Thank you! read more

Came out same day,and it was Saturday in 100 degree heat, quickly diagnosed the problem and was able to fix it right then. Very nice and seemed very knowledgeable, I will definitely call them again if we have any other problems. read more

This is a exceptional company. I would refer them to others in a heartbeat. They are professional and respond quickly. The technicians text you when they are in route to your home, which I love. The technicians also explain all repairs done. They have great respect for your property and is clean when the job is completed. Mike,Ashley, Chris and Joe are more than GREAT! I appreciate all they have done. Deborah J. read more

Great experience all around! The owner Mike took the time to clearly answer any questions I had. Ashley was responsive in the office. Justin, Elijah and Miguel did a great job installing a new HVAC system in my home. They were professional, friendly, careful with our light carpets and had it all done in a day! They also were patient with my questions. I was happy with the rate esp. seeing that they can work through American Home Shield (home warranty plan). read more