We had a great visit from Chris B. and he found that Bell Brothers service tech turned off our gas…read moreline 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.

I had a new AC/Furnace unit installed. They did such a fantastic job I just wanted to give a…read morespecial 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".

Our heater is out. Joshua came to our house to work on it. He arrived on time, and after he…read moreassessed the issue, he explained everything to me. He took the time to show me pictures too. When he arrived, the first thing he did was to put on plastic shoe covers so he didn't enter our house in his street shoes. That showed me respect that I appreciated. Before he left, he offered to loan me an electric heater until we have to wait for parts. He provided excellent care and service. I definitely recommend this company.

Just a heads up, they will only service equipment IF they installed it…read more I have never heard of a service company not willing to work on equipment installed by someone else. If you buy a house, you may not know who installed it. Last week Wednesday (1/7) I called because we had a mini-split installed (DIY) and I was told that before you turn it on, have an HVAC company come out and test it, check the pressure in the lines and then turn it on. When I called, the nice lady on the phone said that they do not diagnose or work on equipment unless they have done the installation. OK, no problem, I called their "sweet" competitor and they sent out a technician within 48 hours to do the job. 2 stars only because the lady on the phone was nice, although again, I am shocked that a service company will not do service calls

My AC went out and I needed a second opinion because another tech I called couldn't find the…read moreproblem and charged me $100 plus suggested I buy a new fan for $1000. Scott was amazing and found the problem right away. The wires were twisted at the bottom of the unit. He explained in detail about the unit and also spent a lot of time throughly cleaning it at my request because it's right next to the dryer vent and we have a lot of debris and dirt from our trees. Only charged $125. He is a super nice guy and very honest. I highly recommend him for all your HVAC needs.

My air conditioner wasn't working so I called airway heating and conditioning they answered before…read morebusiness hours which was a great surprise but we later figured out a good time to come by and Scott gave me a arrival window around 2-5pm arrived at 2 pm which was great! Ask what was the issue I was having explained what can be the issue then he found the problem and got me and my family back to enjoying our home he was informative and professional and reasonable.. greatly appreciated his work and would definitely recommend the company thanks we are cool and comfortable again!

I needed a new package unit installed for a rental property I have in Stockton. I called and DLO…read morecame in with the best pricing. He answered all my questions, went over the details of everything that is needed. If you want a good job done and reasonable price, go with DLO! Thank you for an amazing work!

After our first great experience with David at DLO we decided to have him come out to take a look…read moreat replacing our furnace and air-conditioning unit original to the house 1983. David explained the difference in the units we could choose from for this size house. A quiet A/C was important to me and my boyfriend wanted all the ducts under the house replaced. Vents pipes where replaced and different duct sizes were strategically placed under the house. The air conditioning unit is so unbelievably quiet. I love it! It feels good to turn on the heat/air and know it is blowing clean in the house. A big upgrade after 33 years! Hopefully this efficient system will bring down our PGE bill. David is not a high pressure sales person which I like. His prices are reasonable and his team is prompt and know what they are doing! I highly recommend him!

Our heater has been having a persistent issue of not generating hot air. They were able to come on…read morea weekend morning to inspect it, had the right materials, explained to me the situation, fixed it. Cost $450 and had a 1 year warranty. Pleased with the result, super grateful!!

Did a good through inspection and provided us proper direction to proceed with our issues…read moreSince they could not resolve it, did not try to do some stop gap stuff and gave a proper long term recommendation

I wish I could add an additional 5 stars. I contacted the company late in the evening and Elias…read moreresponded immediately. When he came by the house he asked me what was going on and explained to me that the capacitor that was in the AC was not strong enough. He replaced the piece and was completed within 10 minutes. He told me that the piece that he replaced would be covered for a year versus the other companies I contacted. Thank you Elias and if anyone ask me about your company I will be sending them your way. Brenda

Don't like leaving negative reviews. But I use yelp quite a bit for opinions and I want honest ones…read moreso sometimes negative reviews are needed. Called four seasons, needing an appt for an estimate on replacing my ac. The guy that answered said he'd be able to come by later in the afternoon to just text my adress so I did. Never heard back after that. Kinda sucks because I could have used that time for another company. I'm hot and trying to get the estimate process done with so I can get a new system. Edit owner reached out and was apologetic and explained yelp assigns phone numbers to them that aren't their actual business numbers so the number I texted wasn't valid. I appreciate him clearing up the misunderstanding

What happened Set appt., received and signed bid to complete…read morework. They communicated once parts are ordered we'll schedule works. Then crickets, no response . . . . I called they said scheduling error they would fit me in next week. Then crickets, no response. You should try someone else.

Quick update. Had my new unit placed in July. Winter months came around and I had a little issue…read morewith the furnace. The owner of this company personally made sure my problem was taken care of. They don't just take your money and run. They uphold all of their promises! If asked again would I still choose advanced tech 209 for my install I would say absolutely. You can't go wrong with a family owned operation going above and beyond to uphold their workmanship !

4/5: Took 3 visits for the technicians to figure out what was wrong with HVAC…read more Juan came out first and thought it was the thermostat, I didn't think so because the code that keeps lighting up on my HVAC was 26, from the blinker light message which is the burner unit. Before the technician came out, I did tell Air Tech scheduler that I have to leave by 1130am that day for work and technician came around 9am. Anyway, when I got home from work, the heater didn't turn on because thermostat was set to a specific temperature and inside the house was at least 4-5 degrees colder. Over the weekend, I left a message and I think it was Kim who called back. 2nd Technician came out and it was Nathan. He had to leave and problem wasn't solved and he ran out of time and had to come back again which he needed authorization for so I don't have to keep paying for the same visit when the problem wasn't solved. 3rd Visit: Nathan figured it out and solved it. It did took them 3 visits which was almost 6 hours of my time with approx. 2hrs each time. I'm just glad Air Tech's technicians figured it out finally and didn't go with the MOST Expensive solution for the client first. I tried a different company before Air Tech and they definitely went with a more expensive solution to my HVAC problem. Overall, I'm still pleased with Juan and Nathan that they were able to solve my HVAC problem of why the heater wasn't turning on. I waited 2 weeks before giving a review to make sure my HVAC is working fine, which it is and that's what mattered most to me. The technicians were great! Knowledgeable and both Juan and Nathan didn't mind answer ALL my questions on HVAC and taught me few tips. I gave 4 out 5 because it took them 3times.

the technician was very prompt and knowledgeable and thankful that it was a easy fix, it didn't…read moretake long at al. I will definitely call upon them if needed in the future

I just had a great experience from what could have been a big problem. My fridge started leaking…read morewater and having gone through an expensive water damage situation recently I didn't want to repeat with another disaster. The folks at Jazz Heating Air conditioning and Plumbing were amazing. Understanding on the phone. Very quick scheduling, and the Jazz representative came ver so quickly. And once here they knew what to do, and was able to save me for 1000s of possible damage. Naveed was wonderful. Totally on top of things understood my needs, found out information quickly, and address my issue. Very nicely done! Thanks Naveed and Jazz!

Our mother got a new unit. Install was done right. Overall review on office leadership, mixed, but…read moreinstall team OK.

I'm sorry this is late Musa , I want to Thank You for the fast , accurate, and honest work done on…read morethe install of my AC unit. And with my luck my heater went out that next winter. No worries and no panic I knew who I could trust . Gave them a call and no problem Musa to the rescue. My son just bought his first lil house and of course we called again. Its a great feeling when you can call a company and never worry about being charged for things you don't need , with very fair prices for the things you do. Thank you Thank you We have you on speed dial ​

This company is not professional and does not have the skill to fix the AC. He had an appointment…read moreat 3 p.m. but did not show up at 10:00 p.m. When he showed up at 10:00 PM, he said he might be able to make the AC unit work. He said that it needs to be cleaned and freon added. He charged me $900. The next day, I turned on the AC. It was not work at all. I requested for him to look at it again. He did not come back.