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Building Efficiency

4.7 (90 reviews)
Closed 9:00 am - 5:00 pm

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Services - Building Efficiency

Building energy audit

HVAC installation or replacement

Insulation installation

3 More Services

Insulation removal

Plumbing installation or replacement

Water heater installation

Building Efficiency Photos

Recommended Reviews - Building Efficiency

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Reviews With Photos

Jeremy J.

David and his team installed a heat pump and heat pump water heater in my home several years ago, and I have been very pleased with them and Building Efficiency's ongoing support. When my garage was flooded in late 2022, David and his team helped troubleshoot the heat pump and made sure everything was running smoothly. More recently, I had plumbing issues that required another service visit, and the team was just as responsive and efficient as before. I highly recommend you go with Building Efficiency for your HVAC needs; they are an excellent value!

One of the heat pump units installed by Building Efficiency that keeps our preschool tentants nice and comfortable!

I worked at Nest on the thermostat and energy algorithms for over seven years, and so I'm picky when it comes to HVAC contractors. When I look for an HVAC contractor, I don't just want one who shows up on time and cleans up after themself; I want one who understands building energy efficiency and cares about it! I first worked with David and his team at Building Efficiency when I was in charging of selecting and coordinating an HVAC contractor to perform an energy upgrade for my church. The energy upgrade included installing heat pumps for two different buildings, along with performing a total ductwork replacement and attic insulation upgrade for one building that serves as an office and preschool building. The Building Efficiency team was great to work with, and we love having the heat pumps! Replacing our old fossil fuel-burning gas furnaces with heat pumps that can run on clean electricity was a win for the environment and a win for our comfort. Having been pleased with how the project at the church went, I referred Building Efficiency to a neighbor of mine and also hired them to upgrade the attic insulation in my own home. Lalo and the crew who did the attic insulation and air sealing work were fantastic, and I appreciated that Lalo went the extra mile to do things like loan me some drywall patching compound so that I could fix a pre-existing hole in my garage ceiling before they blew in the new insulation. I'm very happy with the new cellulose insulation, both because I got rid of all of the old fiberglass insulation and because my home stays warm much better in the winter and cool much better in the summer. I wouldn't hesitate to recommend Building Efficiency to a friend or neighbor, and I look forward to working with them again in the future.

the installed heat pump water heater
Benjamin T.

The Building Efficiency team installed 2 heat pumps (1 of them shown in the photos, the other is in a crawlspace that's a little hard to get to), heat pump water heater (shown), new ducts, and attic + kids' room insulation in my 75+ year old home. They did this quickly and efficiently (in under 1 week despite needing to re-duct our home and the random space constraints you'd expect with a 75+ year old home), helping us get the rebates we qualified for and making sure what they put in fit our home. We now have air conditioning (increasingly necessary in the Bay Area) and just better comfort (esp in my kids rooms which used to be too hot or too cold) and the knowledge that everything is electrified (and pairs nicely with our solar installation). They've also gone above and beyond in being responsive to our questions after the install, coming in to rebalance the air flow, answer our questions about air filters, and even troubleshooting a manufacturer's defect. I can't recommend them highly enough!

A photo taken on a separate sun facing wall before insulation install. Taken at same time as prior photo.

Building Efficiency installed insulation into my 1800 sf San Francisco house (which had no insulation prior) at the end of 2021. Insulation was installed both into the exterior facing walls (via holes in the interior drywall) and into the very low clearance attic crawlspace (maybe 1.5-2 feet of clearance). They were willing to crawl in the very small attic crawlspace to get the insulation installed - which was impressive b/c the clearance was so low. Day-to-day life in the house is completely different. The temp is actually regulated. Heat no longer dissipates immediately after being run. The house also doesn't get super hot when the sun shines on the walls. In the dead of winter we used to sleep with wool hats on - no longer! (We've never run the heat at night at still don't.) I actually only use a light sheet when sleeping at night now - even when it's cold. It really is the single best thing I've ever done to this house and I should have done it much sooner. It's as life changing as anything you can do to a house can be lol. I was concerned about having holes drilled in the drywall but they matched the texture of our drywall (skip trowel texture) and you absolutely cannot tell at all that there were ever holes in the drywall. I also got my BayREN rebate timely to help offset some of the cost. All in all a great experience.

Play room during insulation work
Cliff H.

I had Building Efficiency insulate my home. They did an amazing job - really professional, kept to their schedule, was really tidy and covered all the furniture (they even helped me move some of the furniture) and cleaned up each day. I also had them paint our interior which was even better than before. So glad we had this done before winter and makes a big difference (our home is warmer each morning) and we even got an energy rebate. Would highly recommend these guys to anyone. Great price and really professional.

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Ask the Community - Building Efficiency

Do they service their installations?

Hi Christine, Yes, we service our installations.… Read more

Don’t See Your Question? Ask Away!

Review Highlights - Building Efficiency

David Hamburger did the site review/estimating; and office manager, Mae Adams, handled the admin and rebates.

Mentioned in 49 reviews

Read more highlights

Atticare - Attic and Crawl Space Insulation San Leandro CA

Atticare

(759 reviews)

I had a very positive experience working with Samuel and his team to clean and sanitize my…read morecrawlspace as well as my attic, in addition to replacing ducting and insulation in both. Samuel's advice and recommendations seemed reasonable and I feel I got a good value in terms of the services he suggested and the price I paid. The team that did the work and the other subcontractors Samuel recommended, including an electrician and asbestos specialists, also did a great job and were great to work with. I would recommend Atticare to anyone in the Bay Area that is looking for similar services.

I had AttiCare come out for an estimate to clean the attic and provide insulation at a rental…read moreproperty. The estimator's in-person presentation was very good -- professional, clear, and well organized. The overall process was explained pretty well however I needed more info after he left. The one key issue for me was the R-rating and since R-value is a major factor in comparing insulation options, I wanted to understand exactly what was being installed. I tried to follow up with the estimator to get clarification and asked for a call back. While multiple emails were exchanged from what seemed to be the corporate end, there was no actual human interaction, and my request for the estimator to call back failed. Because of that lack of follow-through, I ultimately decided to go with another vendor who was more responsive. AttiCare made a good first impression, but communication after the initial visit failed. I wouldn't proceed without speaking to the estimator. They lost a job due to that.

Brandon's Attic Control

Brandon's Attic Control

(27 reviews)

East Oakland

Breast work, closed holes under the foundation (who knew???) and cleaned up every bit of rat mess…read more Replaced insulation and repaired torn flex-duct. Seriously, Brandon's did a FANTASTIC JOB

I had a fridge in the basement where I kept my work items and all of a sudden it broke down because…read morethe mouse chewed the cables and broke the compressor so I had to buy a new fridge. But my basement had old fashion grids so mouse/rat can easy get in and out so I had to deal with it urgently. Brandon came at a short notice and gave me a quote and said he can come and start the work in 2 days. The other companies I got the quote could only come after 5 days, some of them after 1 week. He also pointed out that my attic insulation is old and thin. And since he has to clean the attic (there were some mouse activities there too) he suggested it's not a lot of extra cost to put the whole new insulation. (I have been feeling cold in the house due to the old insulation so was happy to replace with a new one taking this opportunity). The crew (2-3 people) came for 2 days and fixed all the holes with the mesh in the basement, crawlspace and the attic. Cleaned the droppings, vacuumed the whole place, sanitized and set the traps. They even cleaned the duct in the house. It was a lot of money but with the amount of work they did, I was very happy. I bought the house 1.5 years ago and I wanted these things done anyway (duct cleaning, new insulation) so the mouse control was a good reason to tackle all of them. I would recommend Brandon and his team hightly.

Ocean Air Heating - Heat pump Installed in parking garage

Ocean Air Heating

(159 reviews)

Parkside

Long overdue review for James and his Team!…read more I had hired them a few years back based on their reputation and excellent Yelp reviews for a furnace installation & ducting in my own home and they did an awesome job. Great communication, workmanship, and efficiency. They were first to come to mind again when I recently needed another old furnace replaced in a commercial tenant's space. Time was of the essence and James accommodated us into his busy winter schedule within two days. Since the furnace was very old and ducting was from another era, James communicated right away all of the potential issues. His team even stayed late to complete the install in the same visit so the tenant could have warm air right away. Any unusual or other issues that arose during the install, James communicated and had resolved as soon as possible to ensure client satisfaction. I am very picky when it comes to professional building techs, but would give 10 stars to Ocean Air if I could. My only disappointment is that they do not have a plumbing, electrical, or general building maintenance arm of their business!

It's December 5, 2025 and we just turned on our furnace for the first time this year. I'm grateful…read moreevery year at this time for the excellent work done by Ocean Air back in 2012. I've since had to replace a motor which they did for me, and a thermostat which I did myself. It was great to have someone to call who knew our system & how to fix it.

Building Efficiency - hvac - Updated May 2026

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