I was ready to replace my gas furnace from 1992, and Gabriel was highly recommended to me by a neighbor who had recently replaced their gas furnace. Gabriel provided the most competitive quote of the three that I received. He has a calm and honest vibe, which is actually important to me when I am choosing someone to do major work on my house- my intuition is always accurate! Gabriel replaced the gas furnace with a Fujitsu heat pump in less than three days. He replaced all of my duct work and even caught a significant issue with my water heater venting system (the system was emitting carbon monoxide, not good). Gabriel is a solid, trustworthy person and I will definitely work with him again if I need any type of HVAC work. read more

I was originally going to refrain from this review but it has to be said. To preface this, I want to explain that I write this without malice or ill intent. I have a soft spot for mom 'n pop shops who are working hard to scrape a living and surviving in this world of greedy corporations. And I try to avoid giving inflammatory reviews for the sake of my own internet clout or with an ulterior motive. So please know that this is done is earnest warning to people. I had originally posted a review and then removed it b/c Gabriel reached out. I felt bad but then I was reminded that I lost close to $9k because of E-fficient HVAC (EH) Some years ago I asked EH to install a new A/C system into my home. Gabriel gave a very competitive price that included removing and installing a furnace since the old one didn't support A/C. The job included essentially a full installation of an A/C system. Gabriel was a hard worker and very polite and accommodating. But that's not what was wrong with his work. He installed the wrong furnace or at least installed it incorrectly causing the furnace to push and suck air in the wrong direction. The entire system worked except for this one aspect. Because of this error I NEVER had a truly operational HVAC system in my home for years. I had air blowing in the wrong vents and sucking air in the wrong vents. Gabriel said it was due to some leak in the vents causing cold air not to go through properly and that it was out of his hands. I trusted him. I was wrong to do so. He said he'd plan the next steps for county inspections and he'd give me a call about what to do next. He never called and ghosted me. Fast forward some time later and a different HVAC company comes in and assesses the previously noted problems--the furnace was installed wrong. There were other small nitpick-y issues as well. It also turned out that permits were never pulled by Gabriel. I know this because the new HVAC co. did pull permits and I got them in the mail very quickly, whereas with EH I never got them and looked it up in the county system and it was never listed. The HVAC company had to redo a lot of EH's work and it cost me close to $9k. Now, as I am selling the house, the HVAC system in my (old) home is working and I know what competent HVAC work looks like. It passed tests and county inspections. All done within a couple of weeks with no hiccups. A stark contrast to E-fficient HVAC. I like Gabriel as a person. He's doing his best but niceness doesn't equate to working HVAC systems, nor does it compensate for the loss of nearly $9k. Again I tried to reach out to Gabriel and get help and all I got was answering machines and the EH office ghosting me. Gabriel might be fine for maintenance but avoid for brand new installs. And if you do decide on EH for a new install, ask a LOT of questions and perhaps make a friend in HVAC and ask what to look out for. read more

Gabriel is amazing. He is honest and efficient, his prices are great and he stands behind his word. I would highly recomend his company to anybody who is in need of his services. read more

Gabriel is a good man. On time, professional! Got the job done, took him a while. Because need cared! Cannot go wrong with E-ffcient ! read more

I can't recommend Efficient HVAC enough! Gabriel, the owner and technician, was absolutely fantastic to work with. He took so much time during our consultations, walking me through all the options between a mini split system and central air and heat. He really listened to what I wanted and made it clear his priority was making sure I was happy--and he definitely succeeded. I got a few estimates before deciding, and Gabriel's was not only the best priced but also the most detailed and honest. The value was unbeatable. I ended up going with a mini split system, and I love it. The installation was smooth, and the quality of work was top-notch. Gabriel kept in constant communication throughout and made sure every detail was exactly how I wanted it. If you need HVAC work done, don't waste your time calling anyone else--Efficient HVAC is the way to go! read more

See all

Gabriel was very knowledgeable and fixed two heaters in our apartment complex which were very old and complex. The job turned out to be much more than expected. He kept at it and was able to get them both back to working order. We would highly recommend. read more

Our water heater went out during the holidays, and Gabriel was able to quickly stop by give us advice on options. We had a tight crawl space and he was detailed and patient with us, making sure his suggestions would work within our space constraints. We went with replacing the gas water heater to a new heat pump water heater by utilizing some utility rebates. Gabriel was able to do the install after the new heater was delivered, he came prepped with all of the additional materials and was able to get us up and running with hot water within a few hours. Thank you! read more

I cannot recommend Gabriel enough. I called him at 5pm on a Monday. Within an hour, he arrived at the home. He diagnosed the issue and fixed it on the spot. He was incredibly kind and patient and helpful. He did not overcharge or upsell. I am very grateful for his work and would highly recommend him. read more

Wow talk about EFFICIENT. Messaged Gabriel on Thurs, get a text right away and after a handful of text exchanges, he gets in on Friday morning and replaces an ancient wall heater in less than few hours. Amazing service, reliable, excellent communication, highly recommend!! read more

Gabriel installed a wall heater for us. It was quite the task getting the old one out which was secured in and wall plastered around it and he was able to get it out and install the new one very professionally. After the new install, he patched up the area perfectly and cleaned up very nicely. I highly recommend him. A+++++ read more

See all

Gabriel is a straight up artist when it comes to hvac systems. We had quotes from a few places, including some major names, and when I met Gabriel he was so down to earth and told me exactly what we needed to get the comfort we wanted. He came in 15% lower on price than the big players, who tried to sell their reviews and services as the reason we should pay extra. We had a couple mini splits installed 2 years ago by a different company. They turned out to be mediocre. I walked Gabriel through our issues with contractors in the past, and he gave me real talk on the system they had installed for us. He walked me through my options and gave me an exact quote. Fast forward to installation day, we were installing 3 more mini ductless heads in our house. 2 of them needed lines going under the house to the other side. Gabriel quoted 4 days for the entire project and got it done in 3, by himself! The thing I loved about this company is Gabriel does not outsource his work to subcontractors. Many places will have the owner show up and then send a bunch of subcontractors to do the actual work. That means the quality usually suffers. Gabriel was a 1 man show. Came in by himself hauling all the equipment and did every bit of work by himself. The quality of the installation was amazing. At the end of the project, every piece of conduit blended in with the house and the condenser was nicely fitted on a platform blending in with our other condenser. No excess wires or tubing anywhere. It looks flawless. Gabriel is only contractor I've ever had that has never asked me to write a review. Gabriel did a system check and made sure everything operated perfectly. My previous contractor would defer to tech support and put me on hold for hours to get a resolution. If you want a high quality install from a mom and pop company, where the owner does the work, this is the right place to go. read more

Gabriel is *NOT* out of business, the other review must be mistaken! He completed electrical work for us in November 2024 and we can't recommend him enough. His work is clean and the new outlets he set up for us have completely solved the problems we were having before. He was communicative and stayed flexible even when we changed our original plans. He also spotted an unrelated issue with our water heater while he was working, and made sure to take photos and outline the issue for us so we could address it. We really trust him and will be hiring him again throughout our extended family for both HVAC and electrical work. Thank you so much Gabriel! read more

Gabriel came to replace my baseboard thermostat. He did a great job as expected. Thanks Gabriel!

Across the 5+ decades of my experience of home ownership, I've had cause to hire a lot of people to install or fix something. Yesterday, Gabriel of E-fficient HVAC installed a new hot water heater for us and I'm delighted to share that this experience was one of the rare ones; it was entirely positive. First, when I was calling around to select a company to do the job, Gabriel was completely responsive and over the phone quoted us his flat rate for installing a 50-gallon heater. Every other company cited a range of cost and insisted on sending someone for an estimate. It was so much better and more efficient to be offered a flat cost without add-ons, upsells, conditions, estimates or haggling not to mention that Gabriel's quote was better than any of the others. He arrived on time and promptly set about removing the old heater and replacing it with the new. As our home is built on a hillside, our water heater is under the house and is a tricky installation. True to his word, there was no mention of any additional costs or even a comment about how much work it took to get the old heater out and the ne, w one installed. We strongly recommend Gabriel and E-fficient HVAC for water heater replacement or, for that matter, any service they provide that might be needed. If you work with Gabriel, you'll know what it'll cost you up front and can be assured that the workmanship, attention to detail and professionalism will all be at the top of the scale. It's a pleasure being able to offer a recommendation such as this with no hold-backs, no qualifiers, no exceptions. Straight up: If you need a new water heater, whole house tankless water heater, under sink water heater, etc. contact E-fficient HVAC. read more

Gabriel is an angel! I hired him last spring when I moved to the Bay Area to install air conditioning in my new townhome right before the heat wave. He's always on time, responds quickly, very professional, has unbeatable pricing & goes out of his way to provide services that's beyond your expectation. When my water heater started leaking, he is the first person I would count on and trust to get the job done right. He not only replace my old unit, he also rebuilt me a new stand and cleaned up the mess left by the previous owners, then surprised me with an extended warranty which he purchased out of his own pocket without charging me any additional extra fees. When I'm ready to upgrade to tankless or have my appliances serviced in the near future, I will only call upon Gabriel because he lives up to his business name: "e-fficient" & so much more! read more

See all

The AC in my house started blowing room temperature air yesterday afternoon. Of course, with this heatwave we're experiencing, I didn't expect to get the issue fixed for days if not weeks. Gabriel replied to my message quickly, came to my house this morning and fixed the issue! I can't thank him enough for his help. read more

Gabriel went above and beyond to deliver on his promises. We are wholeheartedly grateful for his expertise and highly recommend him for your next project. read more

We got 5+ quotes for our HVAC installation, and E-fficient HVAC was by far the best in price, responsiveness, and quality. Gabe's consultation was quick, and he genuinely listened to our questions and needs to help us come to the most efficient solution for our installation. Gabe and his team was also very attentive during the installation process, and went above and beyond to make our AC easy to use. We love our new AC! Huge thanks to the E-fficient HVAC team for their work! read more

One of the best contractor experiences I've had. Gabriel immediately diagnosed the faulty valve in my wall furnace and explained my options, including the easy DIY fix even though he was not getting paid for that option. I ended up fixing the valve myself because of his advice and saved me thousands of dollars. He earned my trust. He'll be the first I call for future HVAC issues. read more

E-fficient is great at what they do! Gabriel came and gave me an estimate for what I considered to be a big job (3 HVAC min-splits in the main house and one small one in an in-law unit). They worked hard given my house is on a hill and not easy to get electrical lines up and around. They did a great job with installing all units even working late into the night. I would highly recommend Gabriel and his assistant John and his very sweet admin Alexis for all your HVAC needs. I'm very happy and finally warm :) perfect timing for the cold weather! Thank you Gabriel! read more

Very responsive and accommodating! Will follow your schedule. Great value for the service. They are thorough and they make sure they leave the area clean when project is complete! read more

Gabriel is the absolute best. He has my highest recommendation. Came to my house on short notice. Fixed my gas wall heater quickly and efficiently. And, he is a pleasure to due business with. read more

Gabriel came highly recommended by my handyman professional. My handyman is great so I immediately called Gabriel who scheduled an appointment quickly. The central heater in my single family residence was going off and on randomly and he was able quickly figure out the problem of the circuit board failing. He explained to me the cost of my options to either replace the circuit board or the entire unit and able to take care of the problem the same day. Huge! Thank You Gabriel, I appreciate your help. read more

Gabriel's mama named him right because he is a legit Angel! We had a so called furnace "inspection" a few years ago that comparitively was a joke. Everytime it rained, nasty basement smells were circulating thru the heater vents and the system had gotten loud. There was a possability mice were taking shelter and getting into the ductwork! Gabriel booked an inspection the day after I reached out, and showed up flashlight in hand. It took him about 10 minutes to find holes in the ductwork, a gaping seal near the air intake and a number of other problems. He recommended replacing all of the ductwork, said it hadn't been installed correctly and that he uses better materials. He researched the furnace and said it was functional and fairly efficient. He even explained how we could keep the furnace housing to add combo heat/AC in the future. The ductwork is beautiful now and routed to maximize visibility and access to the crawl space. The system is air tight, odor is gone, condensation leaks are gone and the furnace is much quieter and heats fast! Gabe takes pride in his work and his pricing is excellent for the quality. He booked the job fast and knocked it out, explaining everything along the way. I'm so glad we found him. This level of craftsmanship, communication and expertise is becoming a lost art. Ignore the companies that pay to be at the top of the feed and call this honest, knowledgeable and reliable Bay Area business. read more

Super impressed. Gabe and his crew installed AC into my home about 10 months ago when my wife was 38 weeks pregnant and Oakland was being hit with a heatwave. He came out the next day to quote me and tell me about how they work. Gabe has an extensive commercial and residential background and is very particular about getting work done RIGHT. He ended up rebalancing my whole HVAC system and putting in a fancy 3 zone system. The only thing I'd tell you to be mindful of... Gabe is in high demand and the job can stretch out beyond the quoted time. But, that should just be expected. I would recommend E-fficient HVAC all day long... from my nice cool house. read more

Gabriel and his crew came and installed a new 75 gallon water heater for us. We are happy with the work they did. There was one unexpected issue after the installation and Gabriel was able to resolve it quickly and diligently. I'd say the company is professional, reliable and trustworthy. We highly recommend them! read more

Contacted them for an estimate for Furnace and AC. About 10-15K of business. We had an appt set and they cancelled the day before citing that something had come up. We reschedule for 2 weeks out. In fairness they said they could do it the next day. The night before our 2nd appt, I got another email saying they needed to cancel the time I had set aside. They said the estimator was done at 4 and wanted to know if he could come b/w 5-7. I replied that was the second cancel and I said if he could come b/w 4-4:30, I could do that. I never heard from them. At 5, he called and said he couldn't make it at 5 but could he come at 6:00? NO. Not a business that respects my/customers time. 3X they couldn't meet their commitments. WOW, somebody needs to get their act together. Please stop over promising and under delivering. read more

Gabe is such a great technician. He came to our home on numerous occasions to check on our old AC unit. We finally pulled the plug and decided to replace our AC and furnace altogether. They were very professional in terms of making sure everything was up and running correctly. The only complaint we would have was that they always seemed to be running later than the expected times. However, we are very happy with our new system! read more

We loved working with Gabriel last month when we needed to move our AC unit fit construction, and have it reconnected with full maintenance. He was timely, offered us a realistic quote over the phone without the runaround that other companies were giving us, and made space for us in the same week! His assistant even sorted out the filter problem under our house We will 100% be calling him again for annual upkeep and any future issues. I'm so happy to have found a friendly, knowledgeable, and thoughtful company!!! read more

The time had finally come to install AC in our home. We contacted a few HVAC contractors and chose Gabriel at E-fficient HVAC. Gabriel was on time for our in person consultation and gave us a good estimate with a comprehensive explanation of the work to be done. Gabriel is very knowledgeable in his craft and gave us solid options and information about our project. Gabriel and his crew worked very hard to make sure we were happy. We couldn't be happier with our AC and don't know how we went so long without it. Thank you! read more

This company is not serious Schedule appointment to see air conditioning Never caming Never call Call leave message No return call read more

OMG as soon as Gabriel (the owner) left I busted into my husbands home office and said "the HVAC angel Gabriel said there will be cold air and it was GOOD." Seriously, he saved our AC system during a heat wave with two very cranky 1 year old twins. He charged a reasonable amount and was wonderful, prompt, and easy to work with. He came donned in PPE (mask and foot coverings) and was so so helpful. Can't say enough good things! read more

Been breezing through the heatwaves thanks to Gabriel's great work. And hooked me up with a really efficient AC unit.

I am utterly blown away by my experience with Gabriel. We weren't able to meet at our originally agreed upon time but when we finally met, I found out that his business was impacted severely by the recent looting occurring in Oakland. Even with that going on, he made his way out and fixed the problem promptly. On top of what was going on with his business, I went to go pay him and he left promptly saying that this was his fault and that this one was on him. He's got my trust in who I'd like to do business with. I have a few more items that needs work so I'll be working with him again soon. If you'd like a similar experience with an honest business owner that does things the right way, Gabriel is your man. read more

We had a very positive recent experience with Gabriel. Our neighbor reported the smell of gas and it turns out it was coming from our tankless water heater. We contacted Gabriel who was able come out the next day to assess the situation. He laid out our options and we decided to hire him to replace it. He was very responsive and kept me updated on when the new water heater was available, how the installation was going, when a replacement part had arrived, etc. It was easy working with him and we would definitely contact him again in the future. read more

So grateful that Gabriel was able to fit me in for my AC repair on such short notice. A lot of other companies would only come to do an diagnostic, but would not promise when they will perform the repair because they are too busy! Gabriel is different, he is considerate and he cares. He understands how important it is to have a comfortable home for your family. I DM him on Tuesday, and he was able fit me in on Thursday night even that means he has to work overtime. Now I am ready for another or two heatwaves! read more

Superb experience!! Gabriel has every quality that you look for, in a contractor. Knowledgeable, Patience, flexible, punctual, reasonably priced, clear communication, respectful. Would absolutely recommend him! I would definitely call him for any future HVAC needs. Thank you Gabriel!! read more

Gabriel was knowledgeable, efficient and great to work with. He fixed several AC units in our home and even helped us find replacement remotes from the manufacturer. Would absolutely recommend working with him again. read more

I cannot imagine better HVAC contractor than the "Efficient HVAC". They offer unbeatable prices, high quality job and well coordinated work. They even coordinated the asbestos abating work with cooperating company. The crew of "Efficient HVAC" is highly knowledgeable, and efficient with their tasks. Well deserved name of the company! The manager Gabriel (who also works, when needed, as a HVAC Technician), and Juan (the lead technician) are also certified for electric works, which enormously simplified the whole project. I have compared their quote with the ones offered by competing companies. Going with "Efficient HVAC" was an obvious winner. In addition, Gabriel suggested solutions much better for our house than the other (standard) solutions offered by others. We got greatly working HVAC system without pains and surprises. read more

Gabriel was very personable from the get go and offered me a service appointment much sooner than anyone else (whilst in the midst of a heat wave). He did everything necessary to assure my satisfaction and I so appreciate his emphasis on building a relationship with me as potential repeat customer. His attention to excellent customer service (which seems lacking these days) is as refreshing as the cool air I now can enjoy. Thanks Gabriel! read more