Brian was awesome giving estimate For new HVAC system.I have not Figured my plans yet. Highly recommend! Had 6 HVAC guys Come to house for estimates All six promised estimates by days End on computer and only two Included Blue Diamond did so.Also Only two even went to attic to check duct work Blue Diamond was One. read more

I had project and yelp sent out email to multiful contractors automatically. They were so fast and kind until I gave them my phone number a week ago. After that never contacted me at all. They took my personal info and that is all. I am not happy for the situation read more

I had Blue Diamond come out and fix the mess our original installers made in our attic from 12 years ago (I'm annoyed at how bad it ended up being). They went super cheap and did not install the correct size plenum and ducts, and our house never got cool enough, even though every HVAC person we brought out told us that we had the right size unit for our house. Anyway, Donovan (the owner) actually fully explained the problem instead of just saying "yeah we just gotta rip everything out, here is a quote for $8k". My response was always "Yeah, go f yourself, you just lost a sale". But since Donovan actually took the time to explain, and gave a reasonable quote, I took him up on it. Fast forward to the actual work that was done. I was home while it was happening, but if I was not, I would not have known anything was actually done. JR, Eddie and Ricky were extremely clean. Inside the house, inside the garage and outside in the driveway. I went up into the attic and while I'm not a HVAC tech, it looked like super professional work, like they actually cared about doing a good job, not just about getting it done. It was like nobody was there. I've had contractors leave cigarette butts and fast food bags in my yard before. Nothing like that from these guys. Time will tell how the A/C performs. It's San Diego winter and we do use the heat a bit at night. We did notice that our big front room with a vaulted ceiling that never got warm or cold is now warm.......I mean...that's something! The picture I attached is where they took a small tube and turned it into a big box all the way up into the attic. It's not very exciting, and you can't really tell that they did anything, which is good because the work was really clean. Maybe I will come back in July and update about the A/C, but so far I would recommend Blue Diamond for their work and reasonable pricing. Seriously, it's reasonable. I've had at least 8 HVAC people come out over in the past 10 years kicked them all out until Blue Diamond. read more

Blue Diamond Heating and Air - Up in the Attic - Heating & Air Conditioning/HVAC Near Me - El Cajon, California

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Brian and his team - Junior, Eddie, Mario and Courtney - are fantastic. They are knowledgeable, kind and the epitome of customer-centric. Highly recommended. read more

We had the Blue Diamond guys come install a Daikin Fit system and a whole-house fan for us (just in time for the hottest, stickiest stretch of weather we'd seen all summer) and couldn't be more pleased with the process from start to finish. Alecko was super helpful on the front end walking us through the various options and cost-value tradeoffs before we settled on the Daikin, and scheduling for the install was a dream - couldn't believe they were able to make it out in less than a week after we made the decision. The install team was courteous and incredibly efficient (huge thanks to the DEEP team they brought out for the job - Hernan, Buki, Ricky, Junior, Eddie and Alecko), and they got the job done in barely more than a day on site, and also managed to be so quiet in doing so that my wife wasn't disrupted at all while she worked at home through the install. The guys left everything neat and tidy when they were done, too. Couldn't recommend the Blue Diamond team more!! read more

Blue Diamond Heating and Air - Heating & Air Conditioning/HVAC Near Me - El Cajon, California

I had a very positive experience working with this company on a Daikin multi-zone ductless system. Charles, the technician, was excellent. He was methodical, knowledgeable, and took the time to explain system behavior, protection logic, and diagnostic limitations in a clear and technically accurate way. He understood the difference between functional operation and confirmed system integrity, and he was careful not to jump to conclusions without data. That level of discipline is rare in residential HVAC service. He walked through the diagnostic process, explained how Daikin error reporting works, and clarified what runtime tests can and cannot prove. There was no pressure to authorize unnecessary work, only a focus on gathering proper information and following manufacturer-recommended procedures. I also appreciated the direct communication from Donavan, the business owner and the transparency around scope, process, and options. The company's status as both a Daikin Comfort Pro and Daikin Ductless Pro shows in how seriously they take commissioning standards and documentation. Even though no immediate repair was performed, the visit gave me confidence in both the technical competence and professionalism of the team. If corrective or recommissioning work becomes necessary, I would absolutely move forward with this company. Highly recommended for anyone who values proper diagnostics, manufacturer compliance, and clear communication. read more

They installed a mini split in less than 4 hours. Very Professional from beginning to end of job. They arrived on time. The team were very friendly and explained everything in detail. We highly recommend Blue Diamond and will use them again if needed. read more

Great service. They installed a dryer vent to the exterior of the house for exhaust purposes. Very efficient and excellent customer service. Highly recommended. read more

Junior and Eddie did an excellent job removing my dead dyi install and replacing it with a new mini split. Great work and great communication. It's really worth it to have professionals install your mini split! read more

After 18+ years, our AC decided to stop working. From the initial evaluation by Ozzy, to the install of our new unit by Junior (Gilberto), Hernan, Ricky, and Heriberto - service was excellent. Ozzy came out to evaluate the problem with our AC. He was very honest and upfront regarding the issues with our old unit and the different options regarding repair vs replacement. After deciding to go forward with a replacement unit, Donovan worked with us on which unit we wished to purchase. Absolutely no upsell. The install team was very clean and efficient. Everyone who came to our house was pleasant and did a great job. Throughout the install I had a lot of questions - Junior was very patient and thorough with whatever I wanted to know. The rest of the team was also very kind and answered any questions I had. I highly recommend Blue Diamond. Honest, efficient, and good value. read more

We highly recommend Blue Diamond Heating and Air. Osvaldo arrived at the appointed time and diagnosed our AC. After receiving a detailed explanation and estimate from him, we decided to proceed with the repair. Following week, he explained the scope of repair work again and began the repair. They worked professionally on site and our 7-year-old AC now looks like new. He also sent us a detailed report with photos and videos. Thank you, Osvaldo, Ricardo! read more

My wife and I converted from a gas furnace to an electric heat pump with air conditioning. Blue Diamond took us through the process and carefully explained the various pros and cons to different systems, and made us aware of the rebates that we qualified for. The day for the install, Ernie, Jr, Ricardo, Oscar, and Eddie (5 guys!) showed up and did an excellent job on our install. The removed the old furnace, installed all the new ductwork, evaporator, thermostat, and air-handler in a single day! That by itself would be worthy of praise, but they were all very professional, polite, and patient with my wife and I as we asked them a whole series of newbie questions. They cleaned up everything perfectly, and stuck around to make sure that we were completely up to speed on the new system. I cannot recommend the company enough, and this crew in particular! Thanks guys! read more

Blue Diamond completed an HVAC renovation for my 1,600 sq ft home in Mira Mesa. The project included an air handler replacement (~$5k) and an upgrade to insulated ducts (~$5k). Alecko did the initial quote and was very thorough. He took detailed measurements and listened to our needs. He spent a few hours gathering information for the quote, and I appreciated his attention to detail. The final cost was exactly what Alecko gave us in the detailed quote. A week later, Gilberto and Ozzy completed the installation in about 1.5 days. They respected our home, did high quality work, and cleaned up completely afterward. They explained everything that they did and made sure everything worked properly before leaving. The new system works so much better and is almost completely silent. The entire Blue Diamond team provided one of the best contractor experiences I've had. Everyone was professional, knowledgeable, kind, and pleasant to work with. read more

Absolutely one of the best teams I have dealt with during an extensive challenging install with our very unique home. They think out of the box and provide a ton of value while doing their job. You will not retreat doing business with this company. Thank you Ernie, Junior, Ozzy, Hernan and Oscar for all your support. read more

Oscar and Ernie did a great job with our replacement A/C installation! They were prompt to arrive and covered the carpet so everything stayed clean. Brian and everyone at Blue Diamond has been great to deal with and I highly recommend their services to anyone needed A/C or heating repair! read more

I live in Virginia and I've a property in Santee, California. In November 2024, Blue Diamond Heating and Air charged me $475 dollars for replacing a 24 volte relay for the heating unit at my Santee house. This company was unwilling to provide me with the parts and labor cost when I requested; therefore, their repair charges were not transparent. After the repair had been completed, they refused to credit back the $79 dollars which they had charged me for the diagnoses. Their reason was that the diagnostic fee would be waived only if the repair was done at the same time. It forced me to reasoning with them because firstly, their technician didn't have the parts with him; secondly, he let me waited for the estimate; and thirdly, I responded to their email (the repair cost) in less than two hours after I received their estimate via email. Upon my insisting, they finally credited back the $79 dollars which they had taken from me but never made an apology for over charging me. In overall, this was not a very pleasant experience in doing business with this company; particularly, with both the cost of the repair and not being transparent with what they were charging me for. read more

Seeking help with an 18-yr old HVAC that stopped working, Blue Diamond was highly recommended by a neighbor and now by me. Many thanks to Alecko who made the initial visit, temporary fix, and gave a detailed evaluation and offered recommendations. After the decision to have the system replaced, within a week JR, Heviberto, and Ricky came for the installation. JR explained the work and each step in detail. They worked efficiently and courteously towards my family and home. Great team. JR was thorough in explaining everything. My new system is near-silent and I love that I can now control the settings from my phone! Thank you Blue Diamond team! read more

Blue diamond gave me a really good deal and we're able to beat Home Depot with their estimate. They were able to give us a top-of-the-line AC unit and furnace. The financing definitely helped us. Hernan, Oscar, Jr, and Ozzy were very professional. I feel confident that that they all installed my system correctly and it's going to last for many years. Thank you blue diamond. read more

Blue Diamond was great! They were able to install a ducted heating and air system in my low attic home without sacrificing a closet or other interior space. None of the other companies I had out to look at the job could figure out how to do it, and even told me it was impossible with the low attic clearance and small garage. Charles, Ozzy, and Jr made it happen. I highly recommend this company! read more

I had a great experience with this company. I did my digging for a locally owned business with good customer service, and was not disappointed. I had three companies come look at my systems, and only Blue Diamond took the time to open them up, to give an educated and accurate assessment. The techs who replaced my heating and air on the day of appointment were great. My HOA gave them some logistical challenges that they handled super professionally, and in a way that satisfied the HOA. Hernan, Oscar, Gilberto, Ozzy made the inside and outside units look great, and made it look easy. They offered competitive pricing - this was great because even though another company offered a tempting deal, I was able to get the same deal with Blue Diamond, whose customer service and quality I wanted to stick with. It was especially important to me to find a company I was comfortable letting into my home, and didn't feel like I had to supervise through the whole process. Everyone I met with company was very professional and trustworthy. I would use them again for sure. read more

Blue Diamond Heating and Air - Professional and clean vehicles were nice to see pulling up. - Heating & Air Conditioning/HVAC Near Me - El Cajon, California

This review is on behalf of Jeanette E. they're very helpful, knowledgeable in anything i asked, communication was easy, their boss was seriously helpful with working around schedules and making it as easy as possible. Ernie, Oscar and Ricky were incredible! super nice guys. read more

We had a really great experience installing two mini splits using Blue Diamond Heating and Air and would definitely recommend them. I received quotes from a few companies, and Blue Diamond had very fair and competitive pricing. Donovan worked with us to accomplish everything we wanted while also being conscious of our budget. On the day of installation, Junior, Ozzy, Hernan and Oscar worked on the project and they were very respectful of the space and left everything looking clean and tidy. They walked us through all the steps and any decisions that had to be made, and it was all a very easy process. At the end, Junior and Ozzy were great about talking us through use of the machine and answering any remaining questions we had. Great experience all around! read more

I am a return customer with Blue Diamond. Called and spoke with Courtney to schedule an AC tuneup. On the day of the appointment, Charles, the technician, called and texted me to inform me he was on his way. He arrived at the beginning of the 9 to 11 window I was given. He began the appointment by telling me the services included with the AC tuneup. The AC tuneup was thorough from the inspection of the indoor unit to the outdoor unit. Filter was replaced and vents were cleaned. He was able to replace capacitor for the indoor unit because he had the parts with him. In addition, he mentioned other elements that would eventually need replaced and the benefits of installaing a new AC and heating unit. Charles is extremely knowledgeable when it comes to heating and air. I appreciated the time he took answering my questions. He is always prepared and professional. This company cares about their customers. I purchased the membership plan for $119.99/year. It included the AC tuneup ($109), and it also includes a furnace tuneup and a 15% discount on repairs. They do offer a 10% military discount if you don't choose the membership plan. Blue Diamond offers a great value and amazing customer service from beginning to end. They are my go-to for AC and Heating and I highly recommend this company! read more

Brian is efficient, easy to reach and does honest work. He's helped out with my home AC twice in the last 2 years. Recommend!! :)

Donavan at Blue Diamond a dream to deal with. Prompt replies, polite, articulate and smart. He has a dream team of Gilberto, Ozzy, Hernan, and Oscar who work with him and replaced heater/AC. They were clean, polite and quiet. Work from home and had no issues while they were dismantling the heater, duct work. I've worked with plenty of HVAC people. I love these guys, they get back to you quickly and give you great great service! read more

I knew my A/C unit had an issue and requested service based on other good reviews posted on Yelp, however I was ultimately disappointed when their repair cost about 300% more than I expected to pay. I do want to say they did completed the work and the A/C was working after they were done, but when the repair price was so much higher (the parts price was maybe 8% of the cost) that I would not use them again. read more

We worked with Brian and his team for a whole-house heat pump upgrade. I had spoken to three other providers before and decided to work with Brian and Blue Diamond because he listened carefully to our needs, thoroughly examined the available space and options, and helped engineer a smart and efficient solution. The installation was on schedule and he was fast to respond to complex technical questions or any needed revisions. Excellent work and great experience! The unit is quiet, compact, and capable, just as he described it. read more

I'm not one to leave reviews, but the crew from Blue Diamond was stellar. Not only were they priced the best out of the several HVAC companies I called, but the service they delivered was tremendous. The installation team of Gilberto and Ozzy was on time, communicative, and friendly. They arrived early, completed their work swiftly, and left the work area spotless when they were done. Thank you guys! Long story short, if you are looking for a solid and honest HVAC team, Blue Diamond is an easy recommendation! read more

It started with our AC breaking during the last heat wave, had one contractor come out and said it was dead and can't be repaired. Then Donavan, CEO of Blue Diamond, came out, and fixed it! He could have easily said it couldn't be repaired and quoted us a new system like the previous contractor, but fixed and explained the problem along with age of the system. Our HVAC system was about 20 years and needed to be replaced. We were referred to Blue Diamond by a neighbor. Read a ton of good reviews, met with CEO Donavan to review what we wanted, and he made several recommendations based on need/costs and. We also met with ASI and Baker and decided to go with Blue Diamond due to their price point, but also, fast response time, customer service and trustworthiness. During the Project, Ernie and Oscar were our techs. They were great, on time everyday, friendly, respectful, cleaned up after they were done and hard workers. They took time to ask if I had questions or concerns each day, and then when the project was done, took the time to explain the new Daikin Fit system and how it works. In the end, the Blue diamond team was great, all the way from before the contract was signed to project completion. Highly Recommend. read more

After a month of getting quotes including a big known HVAC outfit and two other smaller shops we decided to go with Brian Armstrong and Blue Diamond Heating and Air. Brian is very personable and extremely knowledgeable. We had tons of questions and he was responsive throughout the whole process. He gave his advice when asked but wasn't determined to steer us in a particular (highest price) direction. The quote we got was very competitive. Today was the install: the 3 ton two stage Daikin compressor and matching evaporator coil, Remy Halo air purifier, and new Venstar Thermostat were installed by expert techs Gilberto, Ozzy, and co-owner Brian. Their work was meticulous. I've signed up with their reasonably priced Diamond Membership to get an annual maintenance call on my furnace and AC each year. 5 stars! read more

Brian was professional from the time of initial contact re: our broken A/C coil. They were one of the only companies willing to fully assess the issue and offer the option of repair vs. replacement. In the end we did decide to replace the coil based on a number of factors, but Brian gave us all the information we needed to understand the pros and cons of the different options available to us. He was patient with my many questions and when the diagnosis/quote process ended I felt very comfortable and confident with my decision. His pricing was very competitive and much lower than the other quote we had already received from another provider. On the day of installation the team (Junior and Ozzy) arrived on time. They were professional, took care in protecting our floors and home, and were also very knowledgable about the services they were providing. We will use Blue Diamond again for our next HVAC project. read more

We could not be more pleased with Blue Diamond Heating and Air! As my husband says, "They did a stellar job!" Everything was perfect from the initial visit, to providing quotes and further communications, to the demo of the old system, to the installation of the new system, to the clean up, and linking our phones to the new system. All of the techs (Junior, Ozzy, Hernan, and Oscar) were timely for the installation and very worked hard getting everything set up perfectly! Brian and his crew were very friendly and personable, and well experienced in the HVAC world. They went above and beyond our expectations. Kudos to all! Thanks guys! read more

Donovan and his team are great. I had several bids by other HVAC companies to replace my HVAC system, and Donovan had the best design to make my home comfortable yet very efficient. They installed a ductless mini split and VRV heat pump system and it works so well. Their workmanship, professionalism were beyond my expectations. I would recommend blue diamond to anyone looking for HVAC repair or installation. read more

The owner of the company spend over an hour with me describing my options and answering my questions. He was very straightforward and understandable. The written bed was exactly as he said it would be and they showed up to do the work exactly when they said they would and it was all done within the day. I had my furnace removed and replaced with a heat pump system so far it's working great. I had a few bids from other companies and blue diamond was comparable though a little bit less than some of the other bids. read more

Owner Donavan & his team were absolutely incredible. Checked out a few HVAC companies and this one definitely seemed to be the all around better fit. From the estimate to the order & install the customer service was impeccable. I would give 10 stars if I could!!! Thanks fellas! read more

Awesome!!!! Company they will treat you with kindness and respect. Hernán and Oscar did a very good job installing my mini split system I highly recommend blue diamond heating and air!!! read more

Yesterday was the second time I have used this company. They were amazing! Charles was so thorough and communicated well. I plan to get all of my properties on their maintenance plan for my mini-splits. read more

Spend nearly a week looking for Contructor who won't screw me with pricing with good work. I heard of BlueDiamond from a friend and he installed my 4 unit Mini-Split system within 1 day. BlueDiamond has a good work ethic, he stayed nearly until mid-night because he was so Worried about making my system Leak-free, if you don't call that being proud of your work I'm not sure what is. Blue Diamond did such a good job, my neighbors hired him to install similar system. if you want good quality job with good price hire Blue Diamond. read more

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We have had our heat pump unit one year now and love it. The initial installation went well and team cleaned up afterwards. Prices are affordable (it's all relative). The company stays on top of scheduling maintenance and on time, and staff is friendly. They make recommendations, but no hard sell. The only issue was that the heat pump leaves condensation in the winter and no system to catch it was installed. So, it pools on the driveway since the concrete is not even. It's not their fault but wish we had known that before and perhaps with something out. Overall, very pleased so far. read more

Brian has been out to my place twice now--once to service my furnace and once when my A/C went kaput. In both cases, communication was great, and he was right on time. I got the distinct impression he knew exactly what he was doing and just generally got good vibes that he is a fair and honest person. With the A/C, he quickly identified and fixed the issue and--unbelievably--didn't even charge me for the service call. I will definitely be a repeat customer! Thank you, Brian! read more