I had problem with AC unit at my business location every year in hot summer time. Two times our AC system totally burnt. I asked McMacter team to inspect for the problem and of course I was looking for a good brand like Carrier to replace old one. Ron kindly inspected the building and found the problem in our ducting system and its connection to the roof unit. They fixed it and also installed the new system same they which was very valuable for me as a business owner to make my clients are comfortable. Definitely, top quality, clean job they do and very good mannered personality. Highly recommend for those who need good quality of product and service! read more

McMaster Heating and Air Conditioning - The new system thermostat - Heating & Air Conditioning/HVAC Near Me - Irvine, California

Update - 10/2025: Unfortunately, I've had to lower my rating based on a recent experience and interaction with the owner of the company. While doing unrelated work behind a bathroom wall adjacent to the garage where the furnace is located, I discovered that the return plenum had several unsealed seams and an open connection into a wall cavity. This area was supposed to be "cleaned and sealed" per the contract but was left incomplete. When I contacted Ron with photos, he said the section wasn't accessible during installation and noted that the job had passed HERS testing. At his request, I measured the opening, but after providing the dimensions, he replied that it still wasn't large enough for his "smallest guy" to enter, without offering any alternative solution or to come out and inspect the issue. Even if full access was limited, there could have been other reasonable ways to seal off the cavity during the installation, such as adding a simple baffle or barrier. At the very least, I would have expected to be informed that the plenum couldn't be fully sealed and that there was an open gap so it could be addressed properly later. I've since sealed the area myself to prevent air from the wall cavity and attic from being drawn into the return. My goal was simply to close off obvious gaps, not to redo the entire installation, but to ensure the return cavity was properly enclosed. We spent a significant amount of money on this system (and also had the company replace my in-laws' PTAC unit), so I had hoped for more follow-through and support when this issue came up. While the system itself performs well, I am disappointed by the response and focus on passing HERS testing rather than workmanship. Given how this was handled, I'd be hesitant to use the company again for future HVAC service or maintenance. read more

Responded same day and were able to get someone out first thing next day. Friendly, professional, quick, and efficient through the whole process. Would recommend to everyone. read more

I highly recommend McMaster Heating and Air Conditioning. I got 3 estimates from different companies to compare the service and quality of the air conditioners they installed. McMaster was the only company that took the time to look at the duct work, electrical panel, and explain why their product was superior. I did my research and not only did McMaster beat the other two in price, they also installed a superior air conditioner! The installation team also did a fantastic job! Turns out there are honest hard working companies out there and McMaster is one of them. Special thank you to Alexis for scheduling and keeping me informed. Thank you to the owners Ron and Maria. We will be using McMaster for all our HVAC needs in the future! read more

We just had our old straight cool/gas furnace replaced with a heat pump. Ron's crew did a great job. His pricing was below the competition, with better equipment, including zoning, ductwork and new registers. Strongly recommended. read more

I stand by my original review 100%. They never solved my AC leak. Within months the coolant was all gone - I called to ask them to come back to take a look but they refused to come without additional payment. I'm leaving this review more than a year after the fact. read more

Spoke to McMaster Heating (Owner) a few weeks ago. Although they were not able to work on my unit due to my location the owner spent about 45 min with me on the phone walking me through some trouble shooting issues and options to replace some components to optimize the system with my layout. Great customer service and support! read more

I am currently a retired Aerospace System & Mechanical Engineer that lived in Westminster. So I searched out the highest quality company and technicians in all of Orange County and LA county. I found McMaster, with NATE certification technicians (North American Technician Excellence certification - a recognized credential for HVAC technicians that demonstrates their knowledge and skills in heating, ventilation, air conditioning, and refrigeration systems. ). After the initial estimate, working with me on schedule, etc, I got the royal treatment with a large crew doing new home installation is record time and done well with attention to details. They installed a the entire system (thermostat, evaporator coil, condenser coil, compressor, expansion valve, air handler (furnance), ductwork, and refrigerant. They also installed a new more efficient furnace for me. A+ service from beginning to end. Highly recommend. I actually did to a friend who got 3 quotes and chose McMaster H&A and was extremely happy he did. His install in his Long Beach home, was challenging, but they did a perfect job (His words, not McMaster). On top, I opted for some Hart & Cooley aluminum registers that do a superior job of airflow control vs the inexpensive stamped metal ones, and that was the icing on the cake. I moved to Paso Robles away from my awesome Carrier system and registers and asked if McMaster could help me get registers for my new home. Ron helped. So I owe him big time. Plus, have a standing offer for them to do a replacement system (two zone) when my current system dies. I'll put the team up for hotel too. But that ship hasn't sailed yet, but it tells you what I think out these guys. read more

We hired McMaster to replace our entire HVAC system with a new heat pump just days before Christmas, and the experience could not have gone more smoothly. Every person we interacted with was friendly, knowledgeable, and genuinely professional. From the first call, to the installation, to the final city inspection, the process was handled with care and competence at every step. We're extremely pleased with both the quality of the work and the way McMaster managed the project. We highly recommend McMaster Heating and Air for anyone needing HVAC service or replacement. read more

2-Year Update - System was installed two years ago and is still working great. Just had them out for the annual service/tune up and everything is in good shape. Appreciated the great customer service and attention to detail. Thanks again for a great installation. read more

McMaster Heating and Air Conditioning - Installation - Finished Product - Heating & Air Conditioning/HVAC Near Me - Irvine, California

I live less than a mile from their service area listed on their website and the Yelp map actually shows me inside the area. I called to get clarification and see if they would make an exception since I am so close. They said they would do an estimate after checking with a supervisor. But less than a day before the appointment another rep messaged me saying they do not actually service my area and canceled. It wasn't the expectation that they would service my area, but being told one thing and then another is the frustrating part. read more

Will keep this short and sweet Installation - 5 Unit was installed very well and in one day Customer Service - 2 Need help in this department. Not the friendliest and not quick to respond to inquires after installation read more

I was able to get my home warranty insurance cover the cost of some of my heater replacement. I could pick my own company and chose McMaster for the amazing Yelp reviews. The process to get the quote, installation, and permit inspection took awhile (I imagine that the company was busy with fixing ACs), but the project was done. The team delivered great service and I would go with them again if I were forced to replace my AC. read more

Our AC unit went down and I immediately had the company who services our units through a regular maintenance plan give us a quote. The service guy came out and said it would be several thousand dollars to repair and recommended a new unit. The company put a sales guy on the phone who attempted to pressure us into an AC unit that ranged from $15k - $30k! I've owned three homes over the years and replaced AC units in the past I don't recall spending remotely close to $15k for an AC unit. And, I have 5 AC units that eventually need replacing so getting a reasonable price and a quality unit was paramount. Fortunately, I didn't fall for the high pressure sales tactic and called McMaster to give us a bid. Ron came out quickly and assessed the situation very professionally without a high-pressure sales pitch. He recommended a Carrier unit that was higher quality with more features and half the price than the $15k - $30k quote I got from the other company. We went with Ron and he and his team did a fantastic job installing the unit in about 3 hours. HIGHLY recommend McMaster - Ron was honest and his price was fair. As my other 4 units go out I expect to replace them with McMaster as he didn't try to gouge me like the other company. read more

We have been customers of McMaster Heating & Air Conditioning for over 10 years and 5 stars aren't enough. We chose Ron and his company to replace our HVAC system after extensive research and meeting with several highly rated and qualified dealers from each of the major brands. Ron and McMaster were the clear choice and it's one of the best decisions we have ever made regarding our home. We continue to use them for yearly maintenance and recommend them at every opportunity. Never a complaint and lots of thank yous for making the referrals - everyone says they're top-notch and recommends them to others. A big thank you to the entire McMaster team - excellence can be hard to find and they exhibit excellence in spades. read more

While we are happy with our AC unit, we are not happy with the service provided. They were dishonest. Years after install we discovered that what we were told prior to installation "You can't keep your whole house fan too" was not true. I think we were told this so they could use the house fan space as part of the AC install; to make install easier for them. We were moving our AC unit upstairs. Super disappointed and would not recommend McMaster. Now we want to install a house fan because we've learned better but the quote from another AC company is upwards of $4k to install. More than frustrated and feel we were taken advantage of by McMaster. The way they installed the new AC unit we have to replace a filter every 3 months now, Whereas before we didn't have to do anything. Arghh! read more

Totally satisfied. We have used McMaster twice now. Once for a rental unit and full replacement of AC and heating system, and today for a fix on our intermittent AC cycling problem. We had some hiccups with the city and sign-off by the inspector, but I blame Lake Forest city for that. Today our tech found a simple outside low voltage lock out circuit board issue and fixed it within 30 minutes and only charged us for the diagnostic fee! Wow, so refreshing not to be pressured into an upsell, or service contract or a whole new AC unit. This kind of service should be rewarded with a great Yelp review. So here you go read more

Did a complete replacement of our HVAC system after almost 30 years. It was a Carrier unit and always extremely reliable, so I looked for a Carrier installer nearby and came across McMaster. Ron was super-knowledgeable when he visited the house and checked out what was needed. I wanted a heat pump, which can sometimes be tricky, but his team has installed lots of them and knew exactly what to do. We ran into the usual sorts of complications along the way (routing of additional wires, etc.), which they handled in a very professional manner throughout (the extra conduits were very cleanly done). And when I've had questions, they get back to me quickly with solid answers. Very pleased with the service and the products, and would recommend to anyone. read more

Our AC was not working. We originally had another company out who was "stumped" on the problem, "needed to sleep on it," & complained the entire time he was in our home. I haven't dealt with any AC companies yet & this was an awkward experience. Our landlord then called McMaster. Alexis easily set up our appointment & was very friendly & professional on the phone. Our tech Anthony showed up extremely early in our time frame which is not always common in service of any kind which was GREAT! Anthony is definitely amazing & skilled at his job. He had our AC problem diagnosed & literally up & running within the first 20 minutes of being here. I was so shocked at how fast Anthony got everything going again considering the last tech from the other company was here for hours. He was very professional, informative, answered all of our questions, & was very friendly. He was finished within the hour & we have AC for the coming hot Summer months!!!! We are so thrilled with the amazing experience we had with McMaster & I am so excited to have our AC back!!! THANKS ANTHONY YOU ARE AWESOME! read more

I hired McMaster to replace my furnaces and AC condensers with Carrier heat pumps and air handlers. I had 3 other HVAC companies bid the job but Ron was by far the most thorough in evaluating the job and explaining the trade-offs between different systems. The McMaster team did an excellent job planning the project before starting any work. For example, days before our scheduled installation Anthony came to check our electrical and plan out how new 240V circuits and low voltage wiring should be run. This good planning led to a smooth and proper installation with no surprises. The installation passed all tests and inspections with no issues. More importantly, my family has been very happy with our new heat pumps. Not only are we more comfortable with properly sized systems, but our garage and side yard look even nicer than before because of the extremely clean installation by McMaster. read more

I can't say enough about the high level of professionalism, value, and customer service McMaster Heat and AC gives to its customers. Maria was very friendly and responsive from the first time I called and explained my AC issue to her. My AC fan stopped working on a Sunday, the soonest they could come inspect my unit was the following Friday and we didn't have AC for almost a week and when the technician Anthony finally came to my house he was amazing! He showed me what was wrong with my unit, explained why it broke, and told me about the part he replaced (capacitor) and how it functions to keep my AC running. He was super informative, and as a customer who knows very little about these things, he provided the type of service one should expect from a company who truly cares about its customers. Thank you so much for everything! I will be referring your company to everyone I know who needs your services read more

I contacted McMaster a few years ago after the company that installed my AC could not discover why my AC randomly turned itself off. They replaced various components that they said was causing the issue, but the problem persisted. Finally the owner of the company told me to call MCMaster and told me that he would pay their invoice if it took care of the problem. Since I had talked my daughter into going with McMaster, I was comfortable calling them. Even though they usually only service their own installations, after hearing of my dilemma and that I had talked my daughter into using them to install her system, they agreed to take a look. Their expert technician, Anthony, did not take long to figure out that the installer had not turned off the motion sensing program on the thermostat. Turning it off did the trick and I have been a loyal customer since then. We have needed trouble shooting every once in a while for other issues, but I attribute that to the original installation. We now subscribe to their annual service plan and feel secure that their servicing is as good as their trouble shooting. I wish we had them install my original system. They may be slightly more expensive than some of their competitors, but their technicians' training and expertise warrant the price. I whole heartedly recommend them. read more

Sorry bud.. you sounded all nice and I thought maybe I was wrong. But NOPE I found the EXACT mailer I used to call and sure enough I "dog eared" your add!!! It's right below "Tree Services". I started looking for the brochure but remembered when I laughed at those #'s he left. And BTW another Co. was there and offered 1/2 the price! (Well $5k and some change). The guy even offered a Veterans discount. But wouldn't accept a CC "cash only" so I opted to think about it and still am! read more

We shopped around and did request quotes from 3 other companies before deciding to have our HVAC system replaced by MacMaster. The price was reasonable and from the very beginning Ron, the owner, was very nice, present and knowledgeable. He came to our house a few times to coordinate and make sure that all of our questions were answered. He really did provide top-notch service and made the whole process incredibly easy and stress-free. The installation itself was done quickly and efficiently by his staff, and with a lot of attention to details. The quality of the system is excellent and we feel like we did get a great deal without sacrificing quality! We highly recommend MacMaster for anyone looking for HVAC services. They provide great quality products, competitive pricing, very professional installation and excellent customer service We wouldn't hesitate to use them again in the future! read more

We recently added air conditionning to our home. McMaster did the work as promised and on time and on budget. The people working for McMaster were pleasant and clean. I highly recommend this firm. read more

They installed a small split system in our Adu, and a bigger system in our home. They were incredibly reliable, professional and reasonable. We had a great experience! We highly recommend them! read more

I shopped a/c companys for more than 2 years. Hubby didn't think we needed it! McMaster was the absolute best choice. Owner Ron accommodated all of our needs. He and his installers were nothing short of professional and we are thoroughly enjoying our new furnace and a/c unit. We got the top-of-line carrier unit and are so comfortable all year around! Hubby is loving it and I'm healthier and allergies have greatly improved. If shopping for a/c, look no further. McMaster is the ABSOLUTE BEST!!!!!! read more

I chose McMaster heating & Air last year after trying several disappointing companies. I found them honest and reliable. They were very helpful in getting our old AC working (before a terrible heat wave hit) as they couldn't fit us in for our installation for a couple of weeks. All the guys are clean, and professional. I trust this company and the Carrier product they sell. This AC unit is so quiet and efficient. We are happy! JB Costa Mesa read more

We had a strange noise coming from the AC unit upstairs.it also wasn't cooling like it used to. Anthony from McMaster, who has already been a great help before, came and identified and rectified the problem. Swift and efficient, just like we always hope things will be. Thank you Anthony! Sunita and Wolfgang Richter read more

McMaster just installed a Carrier AC/Heating system in our home in Fountain Valley, replacing an older system which has been in operation for twenty-seven years. I highly recommend both Ron and his crew. They are extremely courteous and professional. All parts of the transaction; the quote, scheduling, installation, orientation to the new products, and cleanup after the job was finished were all handled by trained, uniformed, courteous crew members. It has been a sincere pleasure to do business with Ron's company. read more

We talked to five different companies regarding replacing our 3-ton 23-year-old Carrier HVAC furnace+AC system. Ron was the most impressive of the bunch, he knows his stuff and he was the only one that sat down with us to lay our our options and to answer all our questions. His estimate wasn't the lowest, but we were confident that we'd be getting a quality system expertly installed. Everyone on his team was professional and helpful during the installation and afterwards, and the new Carrier system is working great. read more

We used McMaster Heating and Air Conditioning to install a completely new furnace and AC system for our house as well as a split duct AC for our bedroom in 2014. Almost 10 years later, we are still very happy with the install and periodic maintenance service that McMaster has performed over the years. As well, due to the highly-efficient system that McMaster recommended, our electricity bill dropped by half. The quality of the installed work was exceptional and allowed me to get a $3,000 state rebate that was offered at the time. Kudos to Anthony for providing exceptional quality of work and professionalism. I trust this company and their people completely, and will continue to use them going forward! read more

After receiving several estimates we decided to go with Mc Master Heating and Air conditioning. They were prompt with the estimates and were able to fit us in schedule within days after receiving the estimate. The price was fair compared to the other bids we received. Alexis the office manager was very helpful and accommodating. They explained everything upfront before we decided to use them. Ron and his crew did an excellent job, they were on time and extremely professional. We would recommend them to anyone needing a new air conditioner or heating system. read more

It was a pleasure dealing with McMaster to replace our broken HVAC system and relocate the return lines into the attic. Their pricing was reasonable and most importantly, they took the time to understand the problems and propose solutions that will address the problems I was having with the existing/failing HVAC setup. It's been about two months and everything is working well. I would highly recommend them for a new/replacement installations. read more

RUN! These guys are not compliant with Ca State law. They refused to service my 94 year old mom's heating unit, Ron McMaster telling us to "go somewhere else" when she was still in her parts and labor warranty. This was after I complained they were going to take so long (2 days) to come out and it was freezing in her home and I was fearful for her health. This is the 2nd time in 17 months her unit has broken down. Then after my husband called, and Mr. McMaster would come out but only if he gave them a credit card. read more

I recently had McMaster Heating and Air installed the Carrier Infinity HVAC system in my house. I did my research and compare the cost and product specifications with different Carrier Authorized Dealers. I chose McMaster not only for great cost savings, but also for the reputations since they also installed the complete HVAC system for my neighbor. The McMaster team are very professional, polite and respectful. They did a great job and the system is working well with the temperature and humidity set to run consistently throughout the day. I highly recommend McMaster for all heating and air conditions services. Thanks Ron and the McMaster team. read more

I had McMaster Heating and AC install an air conditioner at my home. They arrived exactly when they said they would be here, the job took exactly the amount of time to complete as they had said. I work from home and was here the whole time the crew is so courteous and answered all of my questions as well as making sure I knew exactly how to use the smart thermostat from my phone. I would highly recommend them. read more

Last summer, I obtained four quotes for a replacement AC and furnace. I did a lot of analysis to figure out the kind of equipment and size of unit that I thought would work well for my home. When Ron McMaster came to my house to give me the quote, he was patient and answered all my questions (and I had a lot). Of the four quotes I got, Ron provided the only one that included the size and kind of equipment that I believed that I needed. The price for the system was fair, IMO. It was not the cheapest, but it included everything I was interested in. And I appreciated that McMaster is a Carrier factory authorized dealer. The team that installed the system was led by Anthony. Each member of the team was very professional and hard-working. They made sure to clean up everything at the end of each day. Anthony was super knowledgeable. There was a loud rattle which I hadn't noticed in my original system because that system was so darned loud. But with the new Carrier system being so quiet, we could then hear the rattle. Anthony ultimately came back and replaced some kind of pipe, eliminating the poorly-routed one from the original unit's installation. Anthony was so patient tracking down what was causing that loud rattle - I was very grateful. Anthony also took time to explain the new thermostat to me. I requested that Anthony place the thermostat in a slightly different location from my original one, resulting in a hole in the drywall from the original thermostat. McMaster arranged for a person to patch and repair the drywall, which I appreciated. Additionally, Jennifer and all the office staff were very kind and helpful in all our interactions. Now I have a quiet system that keeps the house cool in the summer and warm in the winter. I am very happy with my Carrier system. Lastly, everyone who came to my house wore masks due to covid, which I very much appreciated. Thanks to all at McMaster Heating and Air Conditioning! read more

McMaster Heating and Air Conditioning - Heating & Air Conditioning/HVAC Near Me - Irvine, California

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This review is a little late, but I wanted to post. I have gone a full year since having MCMaster do my new a/c and heater. The a/c has been a dream in The summer and the heater just as good during our cold Cali winters. I had looked at about 3 other companies and McMaster was the best from start to finish. Fair pricing, professional and friendly team, and very helpful in scheduling city/state inspections. Highly recommend. read more

McMaster Heating and Air installed a new AC system at my house and I'm very happy with it. I appreciate Ron explaining different options available. Their team did an amazing job with the AC installation. They did really good work, very professional, and great to work with. read more