I can't recommend these guys enough. Huge thanks to…read moreAlberto's team for doing a very thorough job.

Earlier this year I hired Eco Performance Builders install a new heat pump system, remove my old…read moregas furnace, relocate equipment into the attic, replace all ductwork, remove existing attic insulation, air-seal the attic, and eventually reinstall insulation. The experience was outstanding from start to finish. What really set this company apart is that they actually performed proper Manual J load calculations to size the system--something almost no other contractor I contacted was willing to do (load calculations are code required by the way). Every other quote I received assumed a system size based purely on square footage and would have resulted in a dramatically oversized system. Instead, this team took the time to measure, assess, and design a system tailored specifically to my home's demand. They even performed a blower door test to quantify air leakage--another thing no one else offered. As a result, I ended up with a 2.5-ton heat pump. Meanwhile, all other companies wanted to replace what was there (4-ton) or go even higher (5-ton). One company wanted to put in a 100k BTU furnace which is absurd. Their design work was thoughtful and meticulous. The Manual J and Manual S calculations they did ensured that the system was sized properly including duct sizes and lengths. They showed attention to detail with locating and aiming registers to reduce duct lengths (less energy loss due to being in the unconditioned attic) and to improve comfort (limiting air blowing on you in bed). They also took care to locate the ducts so they can bury them in the future attic insulation as much as possible. The on-site crew was excellent--friendly, respectful, and professional every day. They kept the workspace clean, coordinated work around my partner's daytime sleep schedule, and were incredibly flexible with scheduling overall. I've had to push back adding attic insulation multiple times so I can do a few attic projects first, and they've never complained or made it an issue (I still am not ready and they are fine with it). The resulting system has been working great since they installed the heat pump and air sealed in May. The system is basically silent and my house has been quite comfortable. I'm pretty sure the system has been more efficient than my old furnace based on my energy monitoring system that measures current to the unit and PG&E bills from last year, and this is without attic insulation. Regarding cost, you would think that EPB would be significantly more expensive especially considering they will do the proper design work. However, I got a few quotes additional quotes and EPB actually end up significantly cheaper than all other companies that didn't include any real design work! In short, this is the only company I found that actually does things the right way, prioritizing proper design and customer satisfaction. I thought this would hurt the bank but it didn't. I'm extremely happy with the results and would recommend them without hesitation.

We were referred to this company by multiple HVAC contractors because they supposedly offered…read moreblower door testing. We paid for a Manual J calculation and a Blower Door test to determine the correct heat pump size for our home. Two technicians came on December 16, 2024, and the inspection lasted about 30 minutes. During the visit, they were courteous and professional and promised to provide: * A list of heat pump vendors * The proper heat pump size * Recommended installers On January 4, 2025, they sent us a BayREN Home Energy Audit report, but it wasn't even for our house. The report falsely stated that we had solar panels, which we do not. We immediately reached out to correct the discrepancies and request the Manual J calculation and heat pump recommendations we paid for. Since then, they have given us nothing but the runaround. It is now March 28, 2025, and we still have not received the services we paid for. Despite multiple follow-up emails (at least six or seven over the past few months), they continue to delay and have not provided our Manual J calculation, heat pump size, or vendor recommendations. I'm giving two stars because the technicians who came out were friendly and professional. However, the company's follow-through has been terrible. I agree with the other reviewer who warned not to pay them upfront--as soon as they cashed our check, they disappeared. Avoid this company unless you want to waste your time and money.

Mickey was able to handle our inspection very quickly and professionally. Very highly recommended…read more Thank you Mickey!

This is long overdue, a number of years ago we had building efficiency come out and assess our…read morehome, I felt like they were so knowledgeable, professional, and informative - it was truly a pleasure. The pricing also seemed extremely reasonable. We ended up doing insulation in our ceilings, such a seamless experience and they supported with the rebate process, had finances not been a limitation we would've done walls. Highly recommend, in fact writing this review has inspired me to loop back with them about their suggestion that our furnace is waaaaay overdue.

Installed my furnace in 2018. They moved my furnace in wall to attic which makes it hard to reach…read more In December 2025 Co detectors fired up twice. Since the furnace should be still under warranty I contacted them by email and phone but no response. Don't be fooled by the yelp ratings. This business is hard to work with after the initial purchase.

Bi-annual visit to check HVAC system and replace filter. Communication is super important to me and…read moreAIS is all over it with the text messaging to remind you and confirm your service and also when your tech is on their way. 5 stars! Once Leon R got to my place, he was professional and courteous, treating my home as if it was his mom's house. He explained what he was going to do prior to service and then explained what he performed after service. I've been a long time customer of AIS and I signed to be their customer for at least another year. Thanks for keeping my HVAC system tip top!

I've been with this company for almost 10 years, and they have always provided great service. I had…read morea check-up with Kevin today, and he gave excellent customer service. Very professional, friendly, and helpful. Highly recommend this company for AC and heating services!

We have been enthusiastic trusting customers of Hassler Heating services since 2010. They have…read moreprovided a myriad of heating and cooling services. Our most recent experience was with Tevita who created, added and installed a duct in our entry hall of our 1912 Craftsman. He was punctual, knowledgeable, personable and fastidious. We are thrilled and oh so warm. Thank you, Tevita and Hassler Heating! Christine K. Oakland

Made an appointment and then ... They didn't show up…read more Called almost 2 hours later telling me they were not going to make it, asking to re-schedule. Clearly I .... didn't

It was great working with this team! The hers inspections and close out process are complicated and…read morethey made it easy for us! Highly recommend this patient team.

On time, efficient service and did what I needed them to do. Very competitive pricing too.read more

A very positive experience! We just has SDI insulate the exterior walls of our 1960's-era Belmont…read morehills home, and I was very impressed with the work they did. Their communication with me was excellent, and everyone I interacted with was extremely professional and very skilled in their respective tasks. Big thanks (!) to Joran, Sergio, Gene, David, and the other crew members whose names I didn't get. TY! I feel very comfortable recommending SDI's work - they did what they said they would do, and they did it quickly and professionally! Their estimate was competitively priced; it was neither the cheapest nor the priciest., but all things considered, SDI seemed to offer the best value for our money. I'm also very pleased with the results of the insulation! We had R15 fiberglass blown into our exterior walls, and even after just one night I can tell the house is much quieter. Today's outside temp has been in the mid-50's, which is chilly for early May, so I'm able to write this review with oddly good timing: new insulation works, lol! I'm now very eager to see what it does in the summer heat, which was our main reason for having it blown in. All in all, I am very pleased with the SDI did on our home and feel quite comfortable recommending their services to other homeowners.

SDI came in quickly, priced the job well, and knocked it out fast. I was impressed by how fast they…read moreresponded to my request for a quote. I'll use them again for insulation and may even redo my fireplace!

Robert was very efficient with getting my title 24 paperwork done for me and a very efficient…read moremanner. I will use Him again in the future when needed.

I needed a last minute energy assessment as a part of my permitting/inspection process for a small…read morerenovation, and after the usual people told me their turn around time is 6+ weeks, I started googling for other options. Robert's name came up in the California Association of Building Consultants site. Robert quoted me an incredibly short turn-around time (2 working days!!) and also was slightly more affordable than the bigger firm. He very concisely asked for all the info he needed, even found some tiny errors in the architectural drawings. He then proceeded to turn the whole thing around painlessly and quickly. I wish all the contractors I deal with were as great to work with! If you have a Title 24 energy assessment you need performed, Robert Mao is your guy!

Juan and his entire crew were very professional and dedicated to getting the job done…read more They got rid of rodents in my "attic" that others could not! I couldn't be happier with the results! Thank you!

Fantastic service. Juan was a pleasure to work with and his guys did a beautiful job. I had a…read morecouple of specific requests and they nailed it. Extremely attentive, thorough, excellent attention to cleanliness, and a very competitive price. Could not recommend more highly.