One of my tenants was sure her thermostat was beeping. My regular guy was unavailable so I called A 1. They were professional and low key. We set up an appointment for a tech to visit and the woman who helped then explained the pricing very clearly and simply. No surprises. Today the tech, Eric, came out to take a look. He went into the apartment and immediately found the beep. It was actually coming from an old CO2 monitor that the tenant had put under some clothing! He was very kind about it and reassured her that it happens all the time since she felt rather foolish. He then just said "No charge." And he left. What a great person, Eric, not only to figure it out so fast but also to be so kind. Thank you Eric and thank you A1! I will certainly use you folks in future. read more

So it's that time of year again. Inspection and tune up on the furnace Jake my technician was on time spent an hour on the unit and then took the time to explain all he did. Written report was also supplied Can't say enough good things about this company. Everyone there is so professional and helpful! Definite recommend to my family and friends read more

Austin Is the best! very kind young man he fixed my AC problem. I highly recommend A1 heating and Air! Family owned business who take care of their customers!! read more

Great company, great people. I have A-1 Guarantee installed new Heat Pump, AC and Heating unit few years ago. This company also have maintenance services at low price which I am signed maintenance contract. It is easy to make appointments with them. I don't have any problem with this company. read more

I have been a completely satisfied customer of A-1 for many years. I wisely signed up for the Kelsey Club maintenance plan which has insured the flawless operation of my heat pump heating and air conditioning unit. On my January maintenance I was really impressed with Jake's meticulous inspection and report. Which has mirrored my previous interactions with A-1. read more

We are pleased with A-1 Heating & Air Company with its excellent service in replacing our old leaking water heater. Office staff was friendly, professional and courteous. Nick even came to our home and helped us empty the water from the leaking heater on the same day. Matt H. answered all of our questions and gave us a reasonable and competitive quote that includes their standard one year warranty for labor and materials. Mason did a great job installing the water heater the next day and made sure that the water heater is working properly. We highly recommend A-1 Heating & Air for HVAC, Water Heater and many other services. read more

Leaving another 5 star review for A-1 Guaranteed. A-1 sold and installed new HVAC and PV Solar systems for us in 2017. The sales and installation experience were both excellent. Every detail was handle with care. Top quality! Now, 8 years later I am so happy to share that the servicing experience with A-1 has also been the best. They go the extra mile every time to provide the best service. You know that good feeling when you have found a top notch contractor - that's been my experience with A-1 - everyone from the office, scheduling, and billing folks, to the techs, to the owners (and family). So glad I went with A-1. Special thanks to Nick (solar) and Jake (HVAC) for your great work today. Decided to head right for the computer and leave this follow-up review following your excellent work today. read more

Great job A-1 Guaranteed Heating & Cooling! Kudos to project lead Matt H, and installers Jose and Edgar for quality and excellent work on my new Bryant replacement air-conditioning unit. I will definitely recommend A-1 Guaranteed to anyone needing an air-conditioning project. read more

A 1 Guaranteed Heating & Air - My new 3-ton Bryant outdoor condensing unit. Perfect fit and quality work from A-1 Guaranteed H & C. - Heating & Air Conditioning/HVAC Near Me - Vallejo, California

Didn't get to do a project with them but A1 goes above and beyond answering my questions! Genuinely honest and exceptional communication.

From beginning to completion, we have been immensely satisfied with A-1. Kirk visited our home a couple of times, spending the considerable time needed to do a close examination of our house and answer a long list of questions. He knew his stuff and provided information we hadn't even thought to ask. The foreman who followed up with a pre-install visit and the crew who spent a few days on-site doing the work itself were respectful, efficient, skillful, and even joyful in their work together. We are incredibly glad we finally had this long-anticipated project completed and couldn't be happier with the results and the service A-1 provided. read more

A-1 Guaranteed Heating & Air, Inc., a family owned and operated business, were absolutely awesome! Matt Hiteshew, Comfort Advisor, came out and provided me with a quote on a new Bryant Air Conditioner to replace my old Carrier. Matt was professional, extremely knowledgeable, very honest and provided me with an excellent price on a new Bryant Air Conditioner. Matt provided excellent customer service, was very pleasant and knew exactly what I needed and did not try to sell me something I did not need. The installers, Larry and Edgar did a superb job with the installation. They were respectful, knowledgeable, answered all my questions and did a wonderful job cleaning up after the installation. The office staff, Courtney, Jessica and Kenya were great! They were all very friendly, helpful and responsive to my questions and needs. I will use A-1 Guaranteed Heating & Air, Inc., for all my future heating and air conditioning needs. A-1 Guaranteed Heating & Air Inc., is simply the BEST! read more

I decided to get AC in my Vallejo home and went thru multiple quotes. Matt came out and explained everything to me and went over all of my options. He was so professional and thorough I felt really informed after the initial meeting. It never felt like he was trying to oversell it just seemed honest and informative. That was my first quote and I liked the company so much I was worried my other quotes would be less causing a difficult decision. Well... nope my A-1 quote was THOUSANDS less than the competing bids. Also in other bids I was told It would take anywhere from 2 to 4 days to install while A-1 offered installation in one day. I ended up getting AC and replacing my old furnace. The installation went so smoothly. The team were so great and left my home cleaner than it was when they came. Every interaction I have had with them whether in person or over the phone with scheduling has been fantastic. They are wonderful to work with!!! Also my air conditioner is amazing and I'm so happy with my choice to use this company. read more

Been using A-1 for many years. I have had excellent service and feel good about the professionals they hire. I'm very satisfied with There work. read more

Jorge was punctual, friendly, and professional. He performed scheduled maintenance on my system in a timely manner. He is an excellent representative of A-1. read more

Another amazing visit today by Tyler and A-1 Guaranteed! A-1 Guaranteed fixed our air conditioning unit at our old house about 18 years ago, when no one else could. Since then I have had a service contract and they visit twice a year. I moved my service to our new home in 2017 which has dual air conditioner and heating units. Tyler visits twice a year and services the equipment. Several years ago a module went out in the middle of summer. Tyler came right out and got the system repaired. I can't praise A-1 Guaranteed enough and everyone should use them! The best testimony is an 18-year customer that has regular visits! Best to have a service contract and maintain your units as those systems are the most expense in your house! I completely trust A-1 Guaranteed. Thank you to Tyler for always being the star tech! He knows our house and always reviews the work he performs! Simply the best! read more

Excellent service twice a year. Very pleased with service. Does a thorough job on both heater and Air Conditioner.

Very pleased with the excellent service provided by Tyler. He did a thorough review and addressed all of our questions. Very friendly and respectful of our property. read more

Great team and excellent service! When other companies came in and said "you need a brand new system!" And "aren't you worried about safety?" A-1 techs just come in with experience and credibility to diagnose and fix whatever is wrong. They have serviced my A/C as well as the furnace. From a new gas valve to a new relay, capacitor, and motherboard over the years. They have kept my 30 yr old system running perfectly. Most of my neighbors now use them too! Great value for $$$! read more

We've been using A-1 for our service needs for years. It was finally time to replace our 24 year old HVAC system, so of course we got estimates from as many different providers as possible. The proposal from A-1 was competitive and professional and comprehensive. They replaced all the parts of our HVAC system, including the duct work in the attic. The installation was smooth and they did a great job - especially making sure everything was working properly and everything was cleaned up afterwards. We've had the system for 6 months now, and not a single problem - even more important, our house has never been more comfortable - even the hot summer was more comfortable than it's ever been since we moved to Dixon. Thank you, A-1! read more

Very pleased didn't try and sell you something you didn't need will definitely call on them again

A-1 recently installed a new heat pump for us. They were professional, on-time, helpful and cleaned up after the installation. This is the second job they've done for us. The first was a replacement of the old heating system at our daughters house with a new HVAC system. There they also did a great job. I would highly recommend them for any heating or cooling job. They are great! read more

I switched to using A-1 (and their Kasey's Klub membership) about 6 months ago and have had them come out a couple times. They are professional, knowledgeable, respectful, prompt, and very informative. In short: they're everything you would want in this kind of service. They're solid and I am happy to continue using them. We use them for regularly servicing our HVAC and A/C unit. P.s. specifically, Jorge came out today and was fantastic! read more

We had duct work and our furnace relocated to our attic. The work was completed 1 year ago, so I thought I would let you know how everything has been going... FANTASTIC!!! As first time home buyers, we had NO clue what do about our lack of heating/air. All we knew was that our house would not cool down. We called around to numerous companies until we found A-1. Their price was very competitive, and their service is top tier! After getting the run around and crazy expensive quotes we went with A-1 and they have exceeded our expectations. I feel it's important for potential customers to know that my workmanship is holding up wonderfully. It felt so good going through the heatwaves with a cool home!! THANK YOU read more

My husband and I were thinking of installing central heat and air in our home and a friend of mine suggested I call A-1Guaranteed, she had heard good things about them and were highly rated. I contacted A-1Guaranteed Matt came to our home to give us an estimate, he was very professional, friendly and answered all our questions. We had two other companies come out and I can definitely say, we felt most confortable with A-1 Guarantee doing the job. The job was completed within the time frame Matt said, two days. The team was on time every day, they were very friendly and cleaned after themselves at the end of the day. The work went smoothly and we are so happy with the results! I would highly recommend them. I would also like to mention that the office staff, Kenya, was very patient and helpful with with all the questions I had. Thank You A-1 ! read more

For an outfit that charges a high"maintenance", I found them unresponsive to a situation that should have had quick attention. It took more than 24 hours for a return phone call. We have found another service. read more

They visited our home and provided a written quote, including all the major components and a fixed price. They arrived at the appointed time, did all the work in one day, and left the job site clean and neat. Also, they quickly answered all our questions. We would recommend them to our friends and neighbors, and would consider using the company for other work such as water heater installation. read more

Amazing family owned business very honest efficient business. They won't tell you you need things that you don't need. They're on time and reliable service is excellent. read more

Krissy Hiteshaw, owner of A-1 Guaranteed Heating and Air just sent an email to be very sure everything is working well on our new system. How nice to have this kind of follow up! Please consider using this great company. read more

We contacted A-1 Guaranteed 2 months back when we decided to switch out the 25 plus year old gas furnace from the home we purchased in Berkeley in 2020. the previous winter the gas furnace stopped working after a part went bad and had to replaced (luckily covered under the home appliance warranty. After researching about different Heat pump HVAC systems along with potentially replacing our central air ducts we found many incentives through East Bay Community Energy to switch to electric. Some of the resources can be found through the switchison.org, Tech Clean California and BayRen. A-1 guaranteed Heating and AC is listed among the certified contractors which is required to qualify for the incentives. I was very impressed from the get go with how thorough and professional the team were. Kirk, who is one of the senior sales representatives from A-1 Guaranteed Heating in Vallejo came out 2-3 days after we requested an appointment and went over the process of replacing the gas furnace and installing a new heat pump HVAC including the technical details between the 2 systems. He also provided us education on how they evaluate the home's attic and wall insulation as well as the condition of the ducts. Kirk explained that the condition of the ducts and insulation were equally important to installing a new heating system to make sure that any newly installed system would be designed to run at the highest level of efficiency and comfort. After reviewing all the incentives for our zip code we decided to replace the air ducts and switch to the HVAC heat pump. A-1 Guaranteed heating did a thorough evaluation of our level of insulation to make sure that the system would be sized appropriately. Fortunately our home only required a 2 ton heat pump and they had a fujitsu model in stock. (considered one of the better heat pumps) Kirk also explained that the bid included all the costs including material, labor and permits from the city of Berkeley which requires an city inspection. We did seek out some other bids from other local Heating HVAC installers in the east bay but most were saying it would be 1-2 months before they could even come out to do an evaluation or the other companies' bids were much much higher for the same service and products. Even after accepting their bid if we had any questions or clarifications no matter how small the issue was Kirk would reply promptly answering all our queries. Also the scheduling staff always communicated with us well in advance about potential dates and times for the installations and to confirm that that these times would work for our schedule. Even reminding us of the scheduled dates when BayRen or the city inspectors would coming out to complete their inspections. When the HVAC installers came to our home they all seemed very skilled. Also they were very clean, followed recommended covid protocols and were considerate about keeping us apprised of any items where they or we needed clarification. All the work was completed including the city inspections with 6 weeks which given all the supply chain issues is in record time from what I can tell. After they completed the installation the technicians also let us know that we should monitor how the air flow was in each of the rooms for sometime and if any adjustments that we felt were needed, they would come back and make the adjustments. In our case about 1 week later we decided that one of the ducts did need to be adjusted. After reaching out to Kirk within 1-2 day the technicians came out and rectified the situation. Overall the A-1 Guaranteed Heating and AC team has been a model experience and we felt the team not only placed a value on providing excellent qualified technical installation services but also on providing a great customer experience as well and we highly recommend them. read more

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A-1 Guaranteed Heating & Air recently installed a ducted mini-split heat pump system in my 80 year old house. The project initially seemed daunting to me, but it went smoothly, as the team was courteous, prompt and professional from the first phone call to the final follow-up appointment. They responded kindly and thoroughly to my questions and concerns and resolved any issues that were unique to my house. I highly recommend them. Outstanding customer service and top quality work! read more

Excellent customer service and great work! No complaints on my experience with a water heater and furnace installation.

I had a new AC and Furnace installed one month ago. Both systems to be working well so far and it appears that they did a nice job. Still waiting for the cold of winter to see if Furnace is large enough for the job so far so good. read more

I recently called this company to have a look at my furnace and to do a complete service, years ago I had used them on several occasions, (approximately 20) on all my Real Estate listings. They now refuse to come out unless you belong to their maintenance program. I now use another local company for all my needs. It's a shame they just lost another customer to their stupid business decisions. read more

We have been using A-1 for over 20 years and have never been disappointed. Jorge came out today to service our heat pump system. He texted me when he was on the way and arrived on time. He was very personable, knowledgeable, and was able to answer my questions. Overall, the service was perfect. read more

Fantastic company to work with. Great response, pricing and professionalism. Worked quickly, responded to all of our concerns

We own a 1972 split level that came with a nonexistent cooling and a 50+ year old heating system. The late summer/early fall was us sitting in the two rooms with window units...and the winters brought HUGE PG&E bills due to the furnace. Our neighbor highly recommended A1 to me so I gave them a call. From the first time I spoke with Kirk Schlichting it was obvious why my neighbor praised A1. The service is professional, friendly, and incredible quality. Kirk was able to discuss with me the new cooling/heating systems and what would work best for our home. He even sent me a power point to help me fully understand the big picture of how our home would finally be more efficient!!! The bid was very reasonable and clear. And at the end of the job, when it came time to write the check, the amount that was on the bid was exactly what we paid...no surprises. A1 handled all the permits etc and reviewed the home layout before scheduling the install crew. Our crew was so great! Roger, Edgar, Jose, and Jake worked for two straight days to provide us a great system (heat pump install and a new mini split in our addition) while being so flexible with a household full of two dogs and two small kids.....The guys answered all my son's millions of questions about the tools etc, which just lets you know the incredibly kind character of the crew. When all the work was complete, I was given the informational materials and a review of how our new thermostat works. For the first in almost 9 years we are looking forward to using our entire house during the summertime....no more window units.....wow! Do yourself a favor and reach out to A1, you will be happy that you did!!! read more

Excellent service on our A/c unit by Joe!! Prompt, courteous and professional!! Will definitely call for service again! read more

Kudos to Jorge who provided prompt and professional service to our heater today. A1 can be counted on to provide great service for your heater and air conditioning needs. read more

We have been customers with A1 for over 35 years. Each job and upgrade they have completed for is is handled perfectly. One furnace had an odd vibration that just could not be locate. One day the installer shows up and says he has an idea what was causing vibration. He did his magic and found the problem, a simple fix was the answer. Today Brian came by for the semi-annual checkup. He knows where everything is. No issues. Will see him in December. A-1 is the best there is and they are a longtime local business that does a lot in the community. read more

I have used their services twice in two separate homes. They've always been so professional and have done an amazing job. First home was installing forced heat and removing wall heaters and second was installing a mini split removing wall heaters. Their service is top notch. I highly recommend. Now that we've moved to Brentwood they do not service the location. I'm so sad. I am at a loss of who to trust because I knew I could trust them. I'm definitely dragging my feet in hopes they open their territory. The mini split system is just the best way to go all around and they did a phenomenal job. read more