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Top-Rated Energy efficiency auditors in Lagunitas-Forest Knolls - Updated Nov 2026

Avatar for Posert Energy Consulting
Posert Energy Consulting
4.6(
47
)
Home Energy Audit

Serving Lagunitas-Forest Knolls, CA and surrounding areas

Approved

In business since 2019

Customers say: True professional

"Peter is a very knowledgeable and patient guy - he helped us understand our energy usage and even showed us how to read the usage of individual appliances used in our home. He also provided a full report on potential issues with specific windows, and had really good information about planning for future HVAC improvements. We feel so much better about our future home improvement projects after our home energy audit with Posert Energy!"
Response time2 days
1 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for SunRun LLC
SunRun LLC
5.0(
12
)
Energy Audit - For BusinessHome Energy Audit

Serving Lagunitas-Forest Knolls, CA and surrounding areas

In business since 2007

Free estimates

"Spectacular! I had solar installed and Trevor was super helpful with the process. He made all the complicated paperwork easy. Just like that we have solar and I'd never go back! Double thumbs up for Trevor!"
Install!
Start saving on electric charges
Install in San Diego
Wonder What We Do??
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+8

Recommended by100%of homeowners
Avatar for Attic Masters
Attic Masters
4.7(
33
)
Energy Audit - For BusinessHome Energy Audit

Serving Lagunitas-Forest Knolls, CA and surrounding areas

In business since 2010

Free estimates

Credit card accepted

"Attic masters did a good job at my house by cleaning the ducts. I spoke to them prior and they were nice to me. they gave me several options and explain to me the difference between each one and they recommended me which one to choose. The work that they did was good and the people that did the actual work were very nice. I will hire them again.
"
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+7

Recommended by95%of homeowners
Avatar for Slingshot Power
Slingshot Power
4.7(
3
)
Energy Audit - For BusinessHome Energy Audit

Serving Lagunitas-Forest Knolls, CA and surrounding areas

In business since 2012

Free estimates

Credit card accepted

"The entire process went smoothly. Begin with a system quote from Paul Sherer with a design layout, followed by a feasibility study of the roof and where the panels are to be installed. I have a metal tile roof and the previous solar vendor actually rejected the project. Slingshot first installed the 240v outlet and that took 2 people a whole day to complete, as my electric panel is at the other side of the house from the garage. The panel installation took another 2 days that included the interconnect, upgrading the breakers on the panel. The staff was professional, courteous and focus on doing the job right. Then the city inspection and followed by submitting the application to PG&E. The approval took only 3 days which was a pleasant surprise. Slingshot came out to install a CDD so I can monitor the performance and output of all 13 panels. Not only the project completely very smoothly and on time, the final price I paid is exactly what was quoted from day 1. Now that my electric car is here, I think I can recover the cost within 2 years."
Recommended by100%of homeowners
Avatar for Healthy Duct Cleaning
Healthy Duct Cleaning
3.9(
376
)
Energy Audit - For BusinessHome Energy Audit

Serving Lagunitas-Forest Knolls, CA and surrounding areas

In business since 2011

Free estimates

Emergency services offered

"The cleaning job went very well. It was a job of many surprises( pokaman chips, matchbox size cars,of course legos etc. etc.etc.)! We moved to the house in 88,remodeled a few years later and then never cleaned them. The cleaning was a great check and all is well. In fact they stated that they weren't bad (considering). I was very happy they are in good condition.........................................."
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+17

Recommended by69%of homeowners
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Energy Efficiency Auditing FAQs, answered by experts

Not all homes are suited for solar panel systems. Older roofs or those in poor condition may need repairs or replacement before solar panels can be installed. Some other factors to consider are the amount of sunlight your roof receives, the roof’s orientation and pitch, and any shading from nearby trees or buildings.

There are a few ways to reduce your electricity bills if you use window AC units to keep cool. Set the unit temperature at least 1 degree higher than it is currently to reduce costs. Keep the unit clean for it to run efficiently. You may want to hire a window AC specialist near you to inspect the unit once a year and keep it in tip-top shape.

STC (Sound Transmission Class) is a rating that describes how well a building material or assembly blocks airborne sound. A higher STC rating means less noise will pass through the material, providing better sound reduction. This rating system applies to various building components, including windows, doors, flooring, drywall, and insulation.

For context, a typical single-pane window has an STC rating of around 25 (where normal conversations are audible), while a well-sealed, double-pane window can exceed STC 45 (blocking loud speech and most music). It is important to note that for some products, like soundproofing drywall, the STC rating refers to the entire wall system, not just the individual panel.

Additionally, STC ratings are most effective for measuring sound reduction at mid-to-high frequencies, such as human speech, and may not accurately reflect how well a material blocks low-frequency sounds like bass music or thunder. Because of these factors, it is recommended to consult a professional to determine the right STC-rated materials for your specific soundproofing needs.

Yes, pros suggest units with high EER ratings for energy savings.

Window AC units use a fair amount of electricity, but significantly less than central AC systems. Because they are more energy-efficient for cooling individual rooms or small spaces, their usage is comparatively low. On average, a window AC unit consumes between 500 and 1,400 watts, while a central AC system uses over 3,500 watts—meaning a window unit uses about one-third of the energy. This typically translates to a monthly running cost of $15 to $40, although this can vary depending on external factors.

The Lagunitas-Forest Knolls, CA homeowners’ guide to energy efficiency auditing services

From average costs to expert advice, get all the answers you need to get your job done.