We had a very positive experience working with Eco Performance Builders on a significant amount of…read morework in our home, including attic re-insulation, air sealing, bathroom fan replacements, and a kitchen vent hood installation. We especially appreciated their building science approach. They were thorough in explaining what they recommended and why, helping us understand how the different improvements would work together. They also performed blower door tests before and after the work to verify the results, which showed a substantial reduction in air leakage. Throughout the project, the team was friendly, punctual, and very communicative. Whenever we had questions, they responded and took the time to explain things clearly. We really appreciated their thoughtful approach and follow-through, and we would happily recommend Eco Performance Builders!

So unusually knowledgable, so impressive, so happy to have found Eco Performance Builders…read more The great experience started with instantly talking to someone who could answer questions (usually the person answering the phone isn't so well equipped, or so I have found). Followed by an in house visit by brainy Kyle who can answer lots of questions on the spot. For me that means when I pull the trigger on the heat pump I'm considering, Eco Performance will be my go to.

Alfredo and team were quick to provide a quote, punctual on the date/time of the appointment, were…read moreclean and considerate of my home, and kept me apprised of progress throughout the work. At the end of the appointment we talked through some of the initial observations that were making my home inefficient and he followed this up with a detailed report and phone call to explain what I should prioritize and why. The value is worth it if you feel your house is inefficient as it will pinpoint the problem areas(everything was backed by clear data vs. 5 second observations from HVAC contractors that would lead to $5-20k spend.). The end to end process was extremely smooth and one of my favorite interactions with a contractor to date. I would highly recommend.

Several years ago, we had our first HERS test performed by Elem3nts - and no surprise, our 40 year…read moreold ducts were leaking badly. Fast forward to the present, the HVAC company we selected for a new heat pump and ducts uses Elem3nts to do the required HERS testing AND handle applying for the homeowner's rebates from Silicon Valley Clean Energy and TECH Clean (very convenient). The entire process was smooth - quick and painless. The Elem3nts team was on time, professional, and left the house just as it was after they were finished. They're very experienced and knowledgeable about HERS testing. Communication around scheduling was excellent, and one rebate has already been received and the other is on its way. Elem3nts has been great!

I had a leak in my kitchen island and the plumbing company I used had refer me to Rex and his team…read morefor water mitigation and reconstruction of my island. Rex and his crew were quick to respond and brought his fans over to mitigate the water damage on my island. I had informed him that I needed my cabinets preserved because I was selling my home and worried that the cabinet color were no longer available since they were installed about 9 years ago. He said it could be done and made sure the cabinets were saved from the water damages. His construction team, Kevin and his crew were quick to restore the island once the water on the island was dry enough to work on. They were professional and cleared up the drywall debris after the island was completed. Rex and Kevin made sure to let me know that they wanted me to be happy with their service and that the island was fixed to my satisfaction. They take pride of their work and it shows! Call them when you need a restoration team and reconstruction!

IP provided pre-listing inspection on a home that we inherited. He showed on time and completed the…read moreinspection, explaining every step along the way. Many of the items that he found were corrected, and he updated the inspection report - removing the items/defects, which was very helpful to allow us to "clean up the report" before we found a buyer for the home. I would recommend them and use them in the future.

It was really great working with Mickey. We found them through the BayREN directory. Mickey was…read morereally helpful, very professional, and trustworthy over the phone, and was very honest about what service we needed. Kim was their team member who came and did the inspection for us. She was very thorough. It was a crazy day when she came because the kids were home, but she was really good with them and answered their questions as well. She was here for about two hours and really did a thorough job. She was very knowledgeable and answered all the questions I had, especially since I do not know this type of work. She was able to explain it in a way that made sense to us, and she did a great job. We are looking forward to the report that we are going to get from them.

Mickey is a trustworthy, expert resource for home energy audits who is happy to follow up to make…read moresure you are satisfied

Even 100 stars could not do the justice to what a professional, efficient and caring service that…read moreKatie and Bryan provided: 1. Katie immediately answered my first phone call, explained HERS and the entire process to me, with a super reasonable quote; 2. From the moment I decided to work with them, Katie sent me texts and emails with appointment schedule, and straight forward guidance of CalCERTS registration and reports; 3. The certified validator Bryan arrived on time, with needed equipments and tools, and was VERY POLITE and RESPECTFUL of our property. Just as much as Katie does, he cares about his customers. The HERS testing went so smoothly and professionally. Bryan explained the policy limit of inflow/outflow efficiency ratio must be less than 5%, and we passed. Bryan left passed 12pm, by 4pm the same day we received CalCERTS official report and certificate in our email from Katie. From my first confirmation with Katie, this HERS testing project was done in less than 3 business days! It could be done in 24 hours but I would not be home that time so Katie coordinated per my schedule! After 1.5 years working on a (still ongoing) house addition&renovation project and experiencing so many headaches caused from unprofessional (and/or greedy) contractors, Katie and Bryan are definitely THE BEST. If you ever need HERS testing in Bay Area, please, support honest and great people like Katie and Bryan!

We highly recommend Innovative Energy Solutions HERS Testing. They were referred to us as the best…read morein the industry. From the start, we experienced and felt valued as a customer. We were impressed with Bryan's outstanding professionalism and excellent skills. We immediately noticed his sincere interest, dedication and integrity with regards to resolving any concerns that we had. He was also punctual and very neat and clean. So, it is with sincere pleasure that we would like to acknowledge and commend Bryan for providing us with the very best service. His work is impeccable and exemplary. Katie, at the office, also kept us informed every step of the way. She has impeccable business etiquette, listening skills and professional decorum. We continue to be very grateful to both Bryan and Katie for their time and assistance. You can rest assured that they are a refreshing asset to their industry.

Having our old 1930 house insulated has far and away been the best investment we've made in our…read morehouse. We've lived in the house for over 40 years and were used to sweaters and sweats in the winter and during our hot days spending more time in the cooler downstairs. We now leave the thermostat set at 64 for a low and 74 for a high and the heater rarely goes on. Today (9/9/2026) we think the AC might actually go on later today. Yesterday the house never even reached 74. We had building efficiency do the insulation almost 2 years ago and have gotten so used to our house being in a comfortable range all the time we rarely even think about it. This latest heatwave has reminded us of how glad we are that we did it and that we should give them a plug again! The process itself is fairly disruptive but doesn't take too long and Building Efficiency was very profesional and helpful in minimizing the disruption. Our only regret is that we didn't do it long ago.

Building Efficiency evaluated the property and educated us thoroughly before providing a…read morecompetitive to install a heat pump and water heater. They communicated well, kept a clean work site, and the staff was professional and efficient. We've been very happy with the results.

Brandon spent 30min of his time explaining the details of the HERS testing, what is in the scope…read moreand not in scope. Also he took time to listen to my problem (concern about condensation and moisture) in the HVAC in a brand new home. Based on that he gave me concrete advice to 1/ get the HERS data from the builder 2/ work with an HVAC contractor to inspect select areas (joints, metals, drainage). I had earlier made up my mind on doing the HERS testing, so really appreciated Brandon's time and advice to focus on the right areas. Thank you, Brandon!

Brandon was helpful and considerate with his time explaining HERS testing to me, a prospective…read morecustomer. He is very knowledgeable and eager to share his knowledge when asked. Brandon is a solid professional and a good choice for a HERS rater.

Love AIS. Over the years they have install mini splits throughout our house as well as a…read morespecialized ac unit in our wine cellar. They are very knowledgeable and we're able to help guide us through the process and offer recommendations to help us stay with in budget. Most recently Jose Arroyo completed our semi annual maintenance and he was very efficient and thorough took care of all of our needs, once again meeting our usual expectations of AIS. Honest, timely, respectful of our property, knowledgeable of the industry, and over all really nice folks. Highly recommend!

My technician Pete did wonderful job, my outdoor unit compressor failed to kick in, Pete was able…read moredetect root cause and completed repair and installations swiftly. I will recommend AIS HVAC to the neighborhoods

Three years ago, our Nest thermostat developed a glitch, shutting down the heater if we raised the…read moretemperature by more than 3°F. Since it wasn't a major issue, we accepted it as a minor quirk. During this year's regular maintenance, technician Denali Boyd noticed this issue and offered to fix it. Denali visited twice, consulted with experts, replaced the circuit board, and made sure everything worked flawlessly. He genuinely embodies the saying: "Winners find solutions." Thanks to Denali's persistence and professionalism, our heater is finally working as it should. Dedicated professionals like him build a company's great reputation, and we are deeply grateful for his dedication. He earned Hassler Heating another well-deserved 5-star review!

I had their estimator come out to give me an estimate on a new gas furnace, a replacement. They…read morewere pushing the Navien, which I wasn't crazy about because it introduces the additional technology of using water into the system. But, the guy wasn't listening to me, give me this five page estimate that you needed a law degree to get through. Then, the guy tries to put a hard sell on me, which left me cold. Plus, there price was high, so I went with Atlas who was very professional. Finally, I did a bit of research and found out that Hassler was bought out a few years ago by Seer, a group that now owns 23 HVAC contractors.

I never thought about using a home inspector. I had the pest report, I can look around and see how…read morethings look .. why an inspector.. well I have to tell you.. I am so glad that I called Halcyon. They found things that the pest didn't and things I wouldn't have looked for, more importantly, they found the root of many of the pest report items and had pictures, descriptions and the answer to what needed to be done to correct those issues; so that I had a solid understanding of the scope of work required and as a result (after a few phone calls) cost estimates.. all of this saved me over $100k at closing.. and more, gave me a plan for what needed to be done so I'd have no surprises down the road Suffice it to say, I am recommending you call them!

Julian performed a timely and accurate inspection of our property as part of our listing to sell…read morepreparations. He arrived as agreed and performed a comprehensive review with easy to understand final report.