My centralized heater stopped working right during the holidays. Reached out to many over the weekend and Volta not only called back on Monday but also was able to find someone to check the same day late in the evening. James was able to figure out the issue with the blower right away. Discussed the challenges of finding the replacement parts for bit older model like mine and followed up with call in the morning next day with a quote and placed the order. The office promptly scheduled a follow-up as soon as the part arrived on same day late in the evening. James installed the part and discovered that another part was having issues when the system turned on. He tried his best for several hours though it was too late ~8 PM to keep it running at least for the night. Safety first approach and so turned it off. I would say James was bit disappointed as he cared about us having to deal with low temp this whole time. However he was relentless and very next morning found the replacement part, gave me the most fair and reasonable price for tit. Drove to the warehouse himself and came right back and fixed in no time. He went above and beyond to have the heater working on coldest day of the year. Can't ask for more!!!! Very happy to have found a gem like Volta and that too in our neighborhood. Please do not hesitate to call them. read more

Volta Services were selected by us to replace both the Heater and Air conditioner in our house. James from Volta initially visited to provide an estimate for replacement. During this visit we were impressed by detailed explanation of his approach and his confidence in meeting our schedule followed by a reasonable estimate that was provided same day in writing. We were very Happy we went with VOLTA and the credit goes to James. Yes, in executing the job he was accompanied by Jim. They provided outstanding service ininstalling our brand new HVAC. Their expertise and commkitment to excellence was noticeable in their attention to detail and timely completion of the HVAC replacement. They carefully inspected the system prior to installing and brought all items needed. Upon completion Jim ensured a tour and tutorial of its operation, provided the documentaion and throughly cleaned the place. We observed that he took immense pride in his work. Thank you James and Jim for the excellent and timely job. Thanks You Volta. read more

I had a great experience with Volta Heating, Air Conditioning & Appliances. I initially received a very large estimate from another company for an issue with my heating/A/C system, so I asked Volta for a second opinion. Their team was extremely professional, knowledgeable, and honest. They carefully evaluated the situation and provided clear, expert advice rather than pushing unnecessary repairs. Thanks to their integrity and expertise, I avoided a major unnecessary expense and saved a significant amount of money. It is rare to find a company that combines technical expertise with such strong ethics and transparency. I truly appreciate their honesty and professionalism. Thank you, Volta! I highly recommend them to anyone looking for reliable and trustworthy HVAC, heating, and air-conditioning services. read more

Great service from James! I needed my AC fixed - the receptionist, Alice, was excellent and gave me appointment options for the next day. Upon my request, she said she'd look for same day appointments, and within a half hour, she called back and we scheduled an appointment for today. James (the technician) texted me when he was on the way. He was extremely professional and knowledgeable. He diagnosed the problem within minutes and replaced our blower capacitor. The unit was up and running soon after. James is extremely well-mannered! Not only did he do his job quickly and perfectly, but he was also kind enough to suggest a few other repairs that would help us in the future. I would definitely recommend Volta and James for HVAC repairs!! read more

Called Volta mid Friday because my furnace will not turn on. The guy who answered was very helpful and said he has a technician who can come to my house between 4pm-6pm. I was glad that a technician can come the same day because in other companies i tried the earliest was Tuesday. James, the technician, arrived around 4:30pm and was courteous and pleasant to talk to. He immediately looked at the furnace and my thermostat. James short diagnosed the problem being a bad control board. James quoted me the cost of labor and replacement part. I agreed and James completed the work and solved the problem. I am glad that I called Volta for service as I am very happy with them. read more

We recently had our washing machine repaired and once again received outstanding service. From the first phone call to the completed repair, the team was professional, responsive, and courteous. Their pricing was fair and transparent, and we truly appreciated the excellent communication and follow-up throughout the process. It's clear they value their customers and stand behind their work. We've used their services in the past and have always had a positive experience, which is why they continue to be our first choice for appliance repairs. We highly recommend them to anyone looking for reliable service, fair pricing, and exceptional customer care. read more

I called Volta HAVC service for the second opinion since my home insurance authorised technicians came to conclusion that my refrigerator is not fixable. James, Volta Technician did perfect diagnosis and said that it is a fixable issue and provided the clear report and it helped me to reopen case with home insurance for claims. David, Volta manager closely worked with home insurance and convinced them about the diagnosis report and got authorised for the fix. Finally James fixed the refrigerator, it is working well and also I got some claim money back from insurance. Volta is very professional in service and quickly reachable. read more

I used Volta again and James was again the technician. He installed the latest nest in my older condo and researched another issue which end up being nothing wrong but a simple issue of a switch accidentally turned off and because I had another service, I was not charged for that. He did a thorough job and again, super courteous, on-time and another beautiful job completed. Volta is the best kept secret in the Tri-Valley. Get yourself on the client list and maybe maybe, when they are famous and in high demand, you may be on their priority list. I have used many contractors and they are def a keeper! read more

We had a small issue with overcooling in part of our refrigerator and undercooling in others. We got a same-day appointment with Volta, and James showed up on time, after texting me that he was on the way. Within 5 minutes of arriving he had the issue diagnosed, gave me what felt like a fair quote, and had the issue fixed within an hour. James was courteous at all times, answered whatever questions I had, and explained the service warranty. This experience was pretty much everything you would want to have in a service call. read more

I highly recommend Volta !! I used them for the first time a couple of years ago to repair my air conditioner & was impressed with their technical expertise. In December of 2025, during the busy holiday cooking season, the main burner of my gas stove went out. Their tech, (James) came out in the late afternoon, 2 days before Christmas & resolved my complex electrical gas oven issue. This company is honest, very technical and punctual! A rarity in todays business world. Thank You Again Mike D. (San Ramon) read more

Volta is really great! James came out to help us and he did everything possible to get our old system up and running so we don't have to buy a new one yet. These guys are very honest and very upfront about what they're doing and what your charges will be. They're extremely trustworthy and very responsive. And if you have any issues they go the extra mile to try to help you out. The charges seem reasonable to us. We've used them several times to get our old system to continue to run. Highly recommend them. read more

They quickly answered my request, arrived same day. James was very polite and quickly found the problem with our refrigerator. The problem was that our compressor on our refrigerator died, James had a spare part in his van, he installed it within a couple of hours. And after 12 hours, our refrigerator began to cool again. I will recommend Volta service to all my friends and neighbors. Thanks Volta team . read more

The Technician arrived on time and very polite. He proceeded to diagnose the problem of our dryer and provided an estimate of the cost of the repair. He was very thorough, honest, and clean. At first we were hesitant to have it repair because our dryer is 12 years old. We are glad we found Volta HVAC and Appliance repair. We will definitely call them again for any HVAC and appliances repair. read more

We hired VOLTA to repair a wine fridge who three other vendors tried to fix. James was easy to work with, gave us a fair quote, scheduled the repair in a timely manner, and was professional when he was in our home repairing the fridge. The job was done very well, and cleaned up after. And best yet, the fridge is finally working properly! I would definitely hire them again. read more

Volta HVAC and Appliance repair is safe, fast, and reliable. I needed a dryer repair asap and they were able to give me an appt and fix my dryer same day. James was wonderful and was able to quickly tell us what was wrong, give us an accurate estimate, and was able to fix our dryer in less than an hour. Will definitely be using them again for any appliance repair needs. read more

James from Volta was fantastic! He repaired our dryer quickly and efficiently, even cleaning it out for us. He worked for about an hour and left everything spotless - no mess at all! We really appreciated his thoroughness, especially how he wore shoe covers to protect our floors. I would definitely recommend him! read more

These guys rock! I called them on Saturday morning and by Saturday afternoon we had a completely transformed Kenmore Elite refrigerator with a new compressor, new Freon and everything working perfectly. They were incredibly professional, reasonable, and got the job done. Highly recommend! read more

just an outstanding Service all the way around;, they are on time, professional, straightforward estimates, dictating time & efforts to find a solution to issue you have on hand and very honest. we love them after 22 years of needing nothing to be fixed in our home. you love them too. read more

Prompt response and communication from the first call to until the technician reached the location is greatly appreciated. Professional, helpful and overall good experience using Volta services for the oven repair. Will definitely recommend Volta for appliance repair services. read more