All reviews for Building Efficiency, Inc.

We had a heat pump water heater installed several months ago. The Building Efficiency team was excellent, did great work on the installation and completed it right around when they said they would.

Unfortunately, the water heater died within a month of the install, but the Building Efficiency team stood by their work and came back out to swap out the unit, covered by the warranty. We're hoping to get a heat pump hvac someday and will definitely be back in touch for a quote.

The entire project for a new heat pump HVAC, from system design to estimate through installation was highly professional; everyone was a pleasure to work with.

I've worked with David and team on three different projects - insulating our house, installing a whole house fan, and installing a new furnace and air conditioning - and have been extremely satisfied each time. The work is completed in a timely manner, the prices are reasonable (I did shop around), and team members are very professional and courteous, they have a great deal of expertise, and do high quality work. They also provide great post installation support. When our furnace recently stopped working the week before Christmas, we were in a bind as we were leaving town and could not leave our pet in a freezing home. David came out himself even though his schedule was full and managed to get everything working before we left. I would highly recommend these guys and we will continue to use them on our own future projects.

Best possible experience and I cannot recommend them highly enough! Such a great experience!

Incredible team, professional, terrific communication and great clean work. Absolutely recommend.

Pleasant and efficient building efficiency work, who could ask for more? We appreciated straightforward answer to our questions and Russ & David's willingness to use an unconventional and very ecological product for air sealing. Thanks.

The Building Efficiency team was a joy to work with. They made my life easy at every step of the process.

David and his team are extremely knowledgeable and professional and got our project done efficiently and effectively. Beto did most of the HVAC installation and does his work to a high standard. You can tell everyone cares about what they do and that they aren’t there just there to clock in and clock out. They really want to leave behind a working system that they can stand behind. We really appreciate all of their hard work and definitely recommend them.

Our heat pump system, originally installed by Building Efficiency, had been damaged by another company during some electrical mods to our solar panel breakers, and David Hamburger and crew showed up to quickly and efficiently diagnose and repair the problems, which gave us back our beloved heat pump during a very cold winter's week! Couldn't recommend Building Efficiency more highly----very professional service and a great system!

This company is Amazing. The owner, David Hamburger is very knowledgeable and innovative. Building Efficiency gets the job done in a timely manner. I highly recommend Building Efficiency for HVAC jobs and insulation. They did a great job on my house.

Building Efficiency did an amazing job on my Pacifica house. I had wall heaters ripped out and they put in first insulation in the walls and attic. Next phase was putting in heat pump. They also created multiple zones for my in-law unit to have a separate control..

All controls configured from my smartphone!

David and crew were easy to work with scheduling, working on the house. Super happy with the work, it’s really well worth the investment. The insulation is saving $$ with keeping the heat in and the pumps are efficient.

Highly recc!

Great job with insulating our whole house! Our house is much more comfortable and we got the full rebate which is much appreciated! The painters hid the holes very well afterwards and the cleaners left our house spotless. We would recommend Building Efficiency to anyone.

I am very pleased with my attic and wall insulation. Since I insulated my home, my house feels cozier in the winter and cooler in the summer. David and his team are incredibly professional, experts in their field and very easy to work with. David also worked with us to find the most efficient heat pump that would fit into the area's physical constraints. Highly recommend!

Building Efficiency installed our heat pump 2 years ago and we have been extremely happy with their work.
We recently had an upgrade to our solar panels, by another company, that unfortunately resulted in damage to our HVAC. BE's owner, David, responded to our SOS immediately, even working outside in the rain to untangle the mess. His charge for hours of work was generously waived, we only paid a minimal amount for a new thermostat! We are so grateful to have our system running perfectly again, and will be loyal customers from now until forever!

Building Efficiency’s team is super efficient and does a thorough quality job as their name states. They specialize in blown-in insulation and also can do heat pumps, hvac systems and know about plumbing systems. Creating a well insulated building envelope is one of the best ways to control the temperature fluctuation in buildings. This means occupants of the buildings will be more comfortable, less electricity and gases are used to heat/cooling and ultimately prices for heating and cooling are significantly less in the long term. Building efficiency stands out because they are familiar with many systems and have very competent, knowledgeable and most importantly an honest company. As an apartment multifamily complex, it is work knowing they take good notes, so that even years after we insulated they still know which building had what done. They are understanding and reasonable with their payment plan. Long overdue review and highly recommended!

Building efficiency replaced our two 25 year old gas furnaces with heat pumps in late 2022/early 2023, and did a terrific job. The new system is quieter, safer, and more efficient, plus we now have air conditioning, which is becoming more and more necessary on the peninsula. Dave Hamburger was able to advise us about all different kinds of equipment, and he chose the system that would be best for our house. Sometimes contractors just do the same thing over and over again, but not these guys. The install team was also terrific and accommodating. I highly recommend them!

We used Building Efficiency, along with other vendors, for the complete electrification and energy-efficiency upgrade of our entire house. Building Efficiency replaced our two gas furnaces, upstairs and downstairs, with efficient electric heat pumps. They also replaced our gas water heater with a heat pump water heater. In addition, they coordinated an energy audit, as well as removal and replacement of our blown-in attic insulation. They also coordinated with the electrical contractor, Wells Electric, where we needed new 220 circuits for the new electrical equipment.

David, the owner, and his crew were all courteous and very professional in their work, and the best part is that they also coordinated and submitted applications for whatever energy upgrade rebates were available to us, so we didn't have to fill out all that paperwork!

David was also very responsive when the need arose, and I enjoyed working with him. It was a long and complicated project, and Building Efficiency did their part really well. I highly recommend them.

We're really thrilled with our heat pump from Building Efficiency. They designed a wonderful solution where others said we'd need to dig up a garden or put up with more noise. This solved many existing pain points with our previous furnace setup and air throughput capacity, and our home is so much more comfortable in each zone. The crew was incredibly thorough and professional during installation. We do wish the unit had a usage history graph for us to optimize our energy usage. Still, well worth it and we'll absolutely continue to recommend David and the team for HVAC electrification projects.

Building efficiency was very easy to work with thru all phases of my project: from initial consultation, through rebate applications to the actual project itself. Reliable and professional.

David and the entire Building Efficiency team were polite, professional, and responsive to my needs as a customer. They guided me through selecting the range of home efficiency improvements I wanted to undertake but never pressured me or made me feel like I was being upsold. They ultimately offered me a good price and installed high quality systems in my home.

I appreciated the care and attention they provided to cleaning up and restoring my home as quickly as possible once work was completed.

Overall, I had an excellent experience and highly recommend Building Efficiency.

We recently had Building Efficiency of San Francisco install environmentally friendly insulation throughout our home as well as a SanCo2 stainless hot water heater. From start to finish, the experience was excellent.

The team was professional, on time, on budget, and very straightforward to work with—qualities that can be rare in home improvement projects. Even though it’s summer, we’ve already noticed a significant difference in our home environment: the temperature is far more stable, and persistent drafts have disappeared. It’s clear the insulation is doing its job beautifully. The SanCo2 hot water heater has also been outstanding—efficient, quiet, and reliable.

What really stood out was how seamlessly and efficiently the work was done. Neighbors and other customers seem to echo this same sentiment: Building Efficiency delivers consistently high-quality results, communicates clearly, and respects both schedule and budget. Our own experience confirms that reputation completely.

We would not hesitate to recommend Building Efficiency of San Francisco to anyone looking to improve the comfort and sustainability of their home with modern, environmentally responsible solutions.