Connolly replaced my 30+ year old furnace and air conditioner. Original was a 100,000 btu . They determined an 80,000btu furnace and 4 ton ac would meet my needs. So went with basic Carrier units. Pretty close to previous equipment. Very satisfied with the work quality, pleasant fellows to meet and have any questions I asked answered. I would highly recommend Connolly HVAC to take care of your HVAC needs. read more

I previously had unpleasant experience with Connolly in 2022; viewers can see my extended remarks. On 9/22/2026, their tech visited re: heat pump water heater repeatedly shutting down. The service call itself seemed high, but I had no reasonable comps and did not balk. Tech was on-site nearly 2 hours, trying to troubleshoot; I had no fault with him. Conclusion: faulty MSP breaker. "Cost sheet" price to replace: nearly $500. WTH! Called Connolly, was told that was the price; tech himself said the price included built-in labor. The part itself from nearby hardware store: under $25 including tax. I declined the install and dispatched the tech. The tech was already on-site; with experience, should have taken under 10 minutes. $500 was over-the-top EGREGIOUS. Pigs get slopped, hogs get slaughtered. I cold-called a local electrician who said his rate is $300 first hour. Local hardware store referred me to an electrician who sometimes works there. His rate: just $125. Based on my experiences, I will do no further business with Connolly. For any future service required, I will use other sources. Connolly customers should consider my negative experiences and rip-off pricing. Curiously, the water heater is working ... sans replacement breaker. When-if fails again, with benefit of YouTube videos and guidance from a friend experienced with electrical things, I will replace the defective breaker myself. read more

When our water heater failed early Monday morning, I immediately called Connolly Heating and Air. They had installed our HVAC system in 2024 and provided excellent service at a fair price, so I knew I could trust them again. To my surprise, Connolly also installs both tank and tankless water heaters. By noon the same day, JT from Connolly arrived at my home and had the new water heater installed within 90 minutes. He was courteous, professional, and did a beautiful job. Connolly Heating and Air continues to impress with their prompt response, fair pricing, and quality workmanship. I highly recommend them for HVAC and water heater services. Please support this small family-owned business. read more

Grayson was great. He helped figure out a very tricky problem and took the time to get it right.

Customer service was good, Tech was on time and job was done well. Cost is reasonable.

Do NOT use these people to fix your heater or air conditioner. They entered into a contract to fix our heater and did not fix it. When we tried to get them to come out and resolve the issue, they billed us for the visit which should be covered under the contract. They are FRAUDS. We have to take legal action now. Save yourself the frustration and pain. It actually took them several months to get a part for our heater. We were patient about that, suffering several months in the cold, but after we got the part installed in August, they want to bill us more when we finally needed the heater!?! Absolute criminals. Please do not hire these people!!!!! The worst experience. I am a 5th generation Bay Area resident and have never had an experience like this or have had to write a negative review. The absolute worst experience ever! read more

I had 4 mini splits installed in my home. I have been extremely impressed with the quality of the product but mostly with the excellent service i have received ; after the install they still care and wo t leave you hanging ...they care about their customers and are just excellent. Special shout out to Chris! read more

UNDOUBTLY THE BEST! I am a real estate investor and I found the best Heating and Cooling Company in the business! I called Connolly about repairing my old AC unit and Connolly was one of the only HV/ AC company's that could fix my commercial AC unit. No doubt, most old AC unit should be updated. I'm not arguing that point, but if you are not ready to shell out THOUNSANDS OF DOLLARS this is the best solution!!! They are known for installing the best new HV/AC units and repairing most older units. Tech Expert, Chris Aylard is by far the best I've ever had the pleasure of using to repair my AC. Trust me, being a real estate investor, most companies are quick to upsale you on a new unit that can be repaired and given extra life. Okay, I be a little bias because Chris just saved me literally thousands of dollars on repairing my commercial space AC unit in which I only have a year left on my lease before I am no longer responsible for either repairing or replacing. THANK YOU CHRIS @ CONNOLLY! I am a loyal fan! read more

My 20+ year old HVAC system was due for a refresh, so I set out to get at least 3 proposals. Since my existing Bryant gear had been reliable, I decided to stick with Carrier. The company that serviced my system quoted Rheem, so they were out. And the company that did a great job installing my Ecobee thermostat quoted a furnace that wasn't ultra low nox, so that was out. It came down to two factory authorized Carrier dealers. Either one would have done a great job and the quoted prices were similar. Went with Connolly because their approach was simpler. I'm pleased to share that everything went well. The Connolly team is professional, punctual, polite and executed flawlessly. Their experience really shows in the efficiency of how they get the job done. I was not around when we remodeled, so I had lots of questions this time around and the team patiently educated me as the project progressed, including an overview of the new system. Shout out to Vince, Nick, Eli and Steve for taking such good care of us. Looking forward to phase two when we replace the AC with a heat pump. I highly recommend Connolly and encourage you to consider them for your next project. read more

After constant calls and complaints to the company, they finally sent out the tech that had worked on our unit in the years prior. He quickly realized that there was a sensor that had been knocked into the wrong position on the unit at some point. He turned it back to the correct position everything started working perfectly again. One year later, the unit is still working perfectly. This is a sigh of relief considering that the other techs sent out by the company tried telling us that the system was working as well as it could be expected (not cooling the house below 80-90 degrees in the summer) and that we needed to spend $20k to run an entirely new system if we wanted better performance. read more

I would recommend Connolly Heating and Air Conditioning to anyone. The friendly staff came out and gave us many options. once decided, JT and Jayden came to our home and installed our system. They were professional, knowledgeable and treated our home as if it were their own. They explained the process every step of the way. I give this company and staff 5 Stars. Thank you again Connolly. read more

I was referred to Connolly by an investor colleague and I'm glad they did. Scheduling my appointment was simple and hassle-free. I received automated emails confirming my appointment and arrival window for the technicians (8a - 10a). Around 9:45a the morning of the appointment, I gave the office a call to confirm the technicians were still coming. Long story short, there was a scheduling conflict hence why the technicians haven't shown up yet. Since I took the whole day off to be present for this work, I requested that someone still come today, thankfully we were able to get this scheduled for noon the same day. Come noon, Greyson and Bill were at my door, but unfortunately, they did not have the right tools as they were informed this was an HVAC duct cleaning and not a dryer vent cleaning. They hustled back to the office and arrived back at my home within the hour with the right tools. They immediately got to work and cleaned the dryer vent in about an hour's time. They were both respectful of our house and knowledgeable. We were very happy with the service albiet the scheduling mishap at the beginning. I would definitely work with them again for larger projects. read more

Had a good experience with Connelly Heating and Air. Mini split was dripping water inside the house. I called Connelly Heating and Air and technician Chris A. came out the next morning. He was personable, quickly determined the cause, and fixed the problem. I will definitely call them again should the need arise. read more

New homeowner in Brentwood and our agent recommended Connolly for our HVAC inspection. Their report turned up an entirely broken system, needing new A/C, furnace and duct work. Brian and his team did an amazing job in explaining the report and making replacement recommendations. We went with them for the job, which they just completed today, after about 2 1/2 days of work. Russ and his crew were friendly, arrived on time each day, kept the work areas clean and were super knowledgeable. As first time home owners, it was nice to have a team that walked us through the whole process and did amazing work. We'd hire them again in a heartbeat. It was pretty fascinating to see how efficient they were as a team and how patient they were in navigating the moving boxes in the house and garage. Excellent local business and highly recommend. Review #38 of 100 review goal in 2021 read more

Showed up on time, completed the yearly service thoroughly without trying to "upsell" a new system. Will be calling them again!

The whole team (Nick, Brian, Kelly, JT) over at Connolly are all excellent. We had a HVAC remodel snafu with our builder neglecting to leave sufficient clearance for ductwork. Other vendors were quoting unbelievable prices that involved foundation & framing demolition with tons of over-engineering. But the Connolly team actually took the time to listen to the situation and came up with a creative alternative using a ductless minisplit system. Saved us a ton of time & money. Now we love these units compared to the traditional duct system... the whole system is whisper quiet and we get individual room control as a bonus. When we had a manufacturer cosmetic issue come up about a month later, Nick sent a team out to replace the whole unit right away. It's rare to see such solid commitment to customer service these days. read more

Moved into our house about 2.5 years ago. All the previous owners since 1987 were kind enough to leave every upgrade to us! So our almost 40 year old ac unit is what took a dump this time. We used connolly for our furnace the died the year before so we used them again for the ac. They came out quick to take a look and we ended up needed a new one. They scheduled us for the install only about a week later. I believe the name of the guys who replaced it were john and jt. Im terrible with names. But they did a great job. Showed up on time and were done early afternoon. They did everything with zero mess left behind and the unit seems to be working great. I would totally recommend this company to anyone in need of an ac or furnace. Or even better advice, dont move into a house that hasnt been touched since 1987. Youre welcome. read more

Connolly Heating and Air Conditioning - AC unit - Heating & Air Conditioning/HVAC Near Me - Pacheco, California

I've used Connolly for the past 5 years at 2 different locations. The techs are skilled, issues are well documented and explained, and the scheduling process is easy. read more

Our condo in Walnut Creek needs quieter and more efficient HVAC. Vince came out we a couple of alternates and help arrive at best solution -- a mini-split HVAC System. November of 2024 the work was done on time and professionally. Price was reasonable. Mini-split has been a great solution. read more

If you are needing excellent professional heating / air conditioning work or replacement Connolly is definitely the company to call. Brian came out when he said he would be here and was very thorough in his explanation to me about the unit I had and went over the options for me in the installation of a new heating and an air conditioning unit along with the replacement of all my ducting. We scheduled to have the work done and I was impressed with the communication from Brian and his company about the days and time it would take them to get the job done. The day of the install I had a crew of Nick, Raul and Andrew, who were very efficient and knew their job well. They finished my whole project in two days and left the house clean and feeling warm on a cool day. Thank you Connelly and crew! Will definitely recommend them to all my family and friends. read more

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What an absolutely brilliant experience we had with Connolly. From the very beginning of getting a bid to the final install everything went super smooth and completely professional. The Bid while not the cheapest was very thorough and the field estimator was super easy to work with. Never felt like I was being upsold, and he listened to my requirements. When the day came to install (which was just a little under a week from signing the contract, the two techs that came out where awesome. Kept the place clean, did very throrough and professional work. Overall super happy read more

Chris came out yesterday for an emergency service call. I was so happy they were able to fit me in. Our AC was not blowing cool air and it was a warm day. He spent two hours working on our unit and diagnosed a possible leak. He got the system up and running cool. Chris explained everything in great detail. He came back today to put dye into the system and more coolant, and spent two more hours working on it. Chris goes over and above to make sure everything is ship shape and teaches as he goes. He doesn't leave until his high standards are met. The pricing was reasonable considering all the work he did. I am highly satisfied (and cool), and recommend Connolly Heating and Air without qualification. read more

These guys are legit! We are first time home owners and our tech, Brian, was super informative with all our questions. This was our first big home project and I had full confidence going with Connolly after getting a few quotes. The installation crew, Chad, Eli, Colin and Nick were seriously great. On time and reliable guys. Super friendly and hard working. I definitely would recommend them! read more

We had Russ and Colin relocate our existing HVAC unit. From getting the quote to having them do the work was only a few days. We had planned to have the piping come out of a certain area of our roofline and come down onto one wall on the side of our house. Unfortunately, upon getting into the attic they weren't able to access that area but they worked with us to examine the other possible placements and find the best solution so we could put the unit where we wanted and keep the piping on the wall as neat looking as possible. They ended up having to come back a second day for a couple more hours to finish it off because it was more work than originally expected, but we weren't charged any extra beyond what was originally quoted. The text alerts /reminders when they're coming are nice. The new plastic base and pipe wall cover they installed are nice heavy duty plastic. And they added in a filter that we were missing to help keep the unit running well. Very reasonable pricing and the best value we found after getting bids from a few places. We'd definitely recommend. read more

These guys were the first to message me and talk with me on the phone. Additionally, you could tell from the message that they actually read my initial message rather than sending back an automated statement. +1 on that. To give some context, there's a seemingly intermittent odor coming from my mom's air vents. It was awful over Thanksgiving, but now it's seemingly gone. My concern is that someone comes over, takes my $69 for the diagnostic, and then says "sorry, we couldn't find anything." This would of course force me to try and call another HVAC professional to get a second opinion. If the second party were to find an HVAC-related problem and fix it, I think it's fair to say that the first company would owe me my $69 back, correct? For example, I've experienced this same issue where a Honda dealership couldn't find an intermittent issue with my transmission. I got charged a diagnostic fee, they found nothing, and another mechanic had to find and fix the issue. I gave the paperwork from the other mechanic to Honda, and Honda refunded me the diagnostic fee, acknowledging that it's an issue that they should have found in their own checks. This is the sort of security that I was looking to have in hiring a new company that I don't know and have never worked with before. When I asked her, she said something to the effect of "yes, in that type of scenario you would be refunded." I think to myself, OK, great. Is this documentation available on your website somewhere, or could it be given to me in writing? This is where the whole conversation went sour. I very quickly realized that this very polite person was no longer that person. They were no longer listening, and started talking over me, saying that they are probably not the right company for the job. She talked about how amazing her technicians are, how she's covering for someone who's getting open-heart surgery, and how they're a family-owned business, and how she no longer felt right about this job because I was asking for things in writing. If she were willing to give me the verbal agreement, I didn't see any harm in asking for that type of assertion in writing. Honestly, if she just said it existed on the website, I wouldn't have even checked - in my head, this is a basic common sense thing to provide. I'm just doing my best to be an astute customer and check off some basic check boxes when you're looking for a company to hire for potentially very expensive work. This place is well-reviewed, so I wouldn't recommend anyone against using them. Just be aware that you shouldn't ask for anything in writing from them - they don't like that. read more

I just completed a project with Connolly. They've installed my mini-split air conditioner for my bedroom. First of, Brian was very quick to understand the problem we faced and suggested different options - ducted dual zone, ductless mini-split single zone or multi-zone. We went with mini-split single zone that met our requirements and budget. Compared to other vendors, Brian suggested best location for the in-wall unit and i really liked his approach. They also offered competitive pricing. On installation day, we had Nela and Raul promptly showed up and started the work on time. They analyzed our house/bedroom and attic and suggested different options for installation. I really liked their approach as they always consulted before making any changes and they considered not just installing but installing it right. Its important to have installers like them who realizes that they're not just installing A/C but actually adding value to the home. They went beyond to make sure that we are fully satisfied with their work and never took any short cut to complete the work as soon as possible but rather took their time to install it correctly and completely. Overall an awesome experience and great team!! Would definitely rehire them if there are similar work. read more

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Simply the BEST!!! I can't say enough wonderful words about Connolly Heating and Air! They went ABOVE AND BEYOND from start to finish! The most professional, reliable, experienced experts we have ever hired. If I could give them 10 stars, I would!!! Thank you, J.T. Justin, Steve, John, Grayson, Vincent and Norman!!! Fantastic job!! read more

The owner is a stand up person. There was an incident involving one of their company vehicles. The accountability, communication, and willingness to resolve was appreciated. What could of been a stressful situation was not due to Mr. Connolly's professionalism. If anyone has an issue with this company, I strongly encourage you to simply reach out to the owner. He doesn't have a magic wand or ability to be awake 24/7 to make others worlds perfect, but I do trust he is in the business to make things right. read more

Company was great. One of our tenants was having a issue and I was able to call explain the issue and they had a technician come out and fix the issue. Great service and support. read more

One star because after 3 weeks I FINALLY got a new heater and looks as if things are sealed properly. This is my issue w/ them: So...I had an appt. to get a new heater installed 1/1 or 1/2. They never called or showed up. I left a v/m the evening of 1/1 asking the status. Never heard anything till 1/4 when Stacy called me back and seemed to have no info regarding my missed appt. (during this call no new appts were made..) Four days later I get a call saying they could come in another 5 days... Day 1: So, Nick and Andrew finally came 1.5 weeks after my initial appt. My issue is w/Nick. Twice he opened my bedroom door WITHOUT knocking! I could've been butt naked...the first time was because he needed room to move the furnace around the corner, which is fine but obviously you need to knock!?! 2nd time I was lying down and he just opened the door. I turned and just looked at him. He said, "Oh, hello. I just need to plug this cord in." I was shocked and responded, "Okay.." No knock, no "I'm sorry." Day 2: I shut my bedroom door, and briefly went into another room. I came out and my door was wide open! I said, "You needed to go in there again?" Nick says "Oh, I jus needed room to cut something." He could've turned himself the opposite direction (down the hall) to cut whatever it was he needed to cut. I didn't have an issue w/ Andrew because he has some manners and knows how to knock. Apparently, Nick has no home training and doesn't know boundaries. WTF? read more

I worked with Connolly to replace my 20 year old heating and A/C units. Brian, the Connolly representative came out and gave me multiple options and combinations to fine tune the system to my needs and budget constraints. There was no high pressure sales, only options for me to choose from. They quoted me a two-day installation but it was completed in just one-day. I appreciate a company that under promises but over delivers. I have no hesitation in recommending them for your next HVAC job. read more

The technician was on time and very professional. He checked out the systems promptly and identified some of the issues we expected. We were quite pleased with how the visit went and how he advised us on future options. The office folks were prompt, helpful and personable. Everything about our experience was seamless. We will definitely be using them going forward. read more

This was basically the email I replied with to the owner. Just wanted you to know I called to return your message. $69 to come give me a quote.... Really??? I've been around construction my entire life, from being a PM and an estimator, to running sales for one of the country's largest window manufactures, and have never heard of someone charging for an estimate. Good luck and you can bet I'll leave a review. John read more

Our 9-yr old gas fired furnace somehow stopped giving us warm air over the weekend of January 6-7 when outside temps were in the high 30s or low 40s, inside temps were low to mid 50s without heat. We were freezing. Techs from Connolly were able to come before noon on Monday 1-8 and fixed the problem quickly for a very modest fee. I highly recommend this company as one that's very responsive, charges only reasonable rates, knows what they're doing, etc. I can't say that about too many service companies in the East Bay but Connolly truly is worth using. read more

From the first call for an estimate to the completion of a 3 head mini split install, this experience was top of the line. Victor showed up on time, answered my questions and provided advice then had an estimate in my hands in moments. When the installers (Nick and Chad) arrived, they were on time, professional, thorough, and just all around nice guys. The supervisor checked in every day, although I can't imagine these guys need much supervision. They even left my house cleaner than they found it! WOW! Don't hire anyone else. read more

HVAC unit was not working. Connolly has always been our "go to" for honest, reliable and affordable HVAC repair. Once again, they did not disappoint. A competent and friendly Connolly employee quickly resolved the problem. I absolutely recommend them. read more

Gold stars to all at Connolly. I used them in 2017 to replace our ancient 30+ year old furnace & that went extremely well, so it was long overdue to replace the paired 30+ year old AC. I knew exactly who to call. From the initial office interaction with Stacy & Danielle, to the top-notch world-wide team of Nick & Chad, it was an efficient & perfect experience!! Nick & Chad definitely knew what they were doing & were obviously experts in their field but then the added smiles, communication, explanations & clean-up definitely solidified the day. On top of that, they take care of all the paperwork & permits!! I highly recommend Connolly for all your heating & AC needs. It's obvious that this is not 'their first rodeo'! Thanks again to one & all...now looking forward to an energy efficient & low PG&E bill!!!! read more

Arrived on time. Did a great job fixing out a/c. Found the problem right away. It was a lose wire on the control panel.

At the recommendation of my real estate agent, Connolly was contacted to take a look at a non-functioning heater. Brian arrived during the expected window of time and was able to determine that the furnace was indeed working. Hooray! Brian was the ultimate professional and expert whom I gladly recommend. read more

Those of us who work in the customer service industry know of Customer Effort Score. How easy was it to transact with this business. These guys get a 5 out of 5. You make an appointment, they email and text reminders, the tech shows up, fixes the device and leaves. Very simple. Unlike the other nimrods I've called that show up late and/or don't know my Carrier HVAC and so they guess. Or charge a fortune for doing nothing. Or have to come back. Get the picture? read more