Top-rated energy efficiency auditors.

Get matched with top energy efficiency auditors in Mill Valley, CA

Enter your zip and get matched with up to 5 pros

Need a pro for your energy efficiency auditing project in Mill Valley, CA?

Select your specific project to find the pro for you.

Verified Reviews for Energy Efficiency Auditing pros in Mill Valley, CA

*The Angi rating for Energy Efficiency Auditing companies in Mill Valley, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Energy Efficiency Auditing needs.

*The HomeAdvisor rating for Energy Efficiency Auditing companies in Mill Valley, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Energy Efficiency Auditing needs.

Last update on December 04, 2024

Find Energy efficiency auditors in Mill Valley

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

Serving Mill Valley, CA and surrounding areas

Approved

In business since 2019

Customers say: True professional

"I highly recommend having Peter do an energy audit on your home. He gave me valuable recommendations on how I can make my home more cozy and energy efficient."
Response time2 days
6 neighbors recently requested a quote
Recommended by95%of homeowners
Request Quote
Avatar for Apollo Energies
Apollo Energies
4.3(
2
)
Home Energy AuditEnergy Audit - For Business

Serving Mill Valley, CA and surrounding areas

Approved

In business since 2000

Customers say: Quick response

"Apollo did a fine job assessing my townhomes energy needs. The energy report covered what I needed."
Before and after attic insulation
Attic insulation
Normalized Indoor Iemperatures
Response time2 days
Response rate87%
14 neighbors recently requested a quote
Request Quote
Avatar for Mega Power Electric, Inc
Mega Power Electric, Inc
5.0(
191
)
Energy Audit - For BusinessHome Energy Audit

Serving Mill Valley, CA and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"Excellent Service from planning through Execution and installation to final fine tuning. The folks communicated well and explained every detail of the step. Got permit and inspection done. It was seamless. Thanks. R."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+32

Recommended by100%of homeowners
Request Quote
Avatar for Service Champions Heating & Air Conditioning
Service Champions Heating & Air Conditioning
4.6(
688
)
Energy Audit - For BusinessHome Energy Audit

Serving Mill Valley, CA and surrounding areas

In business since 2003

Free estimates

Emergency services offered

"Our Service Tech, Alex Peck, arrived on time to perform the annual check up & tune-up of our HVAC System. He was very professional and following the Tune-Up asked if there was any other items that needed done or looked into that he could take care of. His services were very much appreciated and very professional. Lee"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+42

Response time9 hrs
Response rate100%
Recommended by91%of homeowners
Request Quote
Avatar for Independent Powur Solar Energy Consult.
Independent Powur Solar Energy Consult.
5.0(
5
)
Energy Audit - For BusinessHome Energy Audit

Serving Mill Valley, CA and surrounding areas

In business since 2017

Free estimates

Emergency services offered

"Absolutely Great!! I am so pleased and happy with the work that was done!! I would certainly have more work done by this company when I need to!!!"
Before Install
ACT NOW BEFORE THE PROMOTION COMES TO AN END!
Installation Process
Clean Looking Black on Black Panels!!!
Side by Side Comparison of what the Black on Black looks like vs Black with white grid lines!

+25

Recommended by100%of homeowners
Request Quote
Avatar for Green NRG Inc.
Green NRG Inc.
4.1(
62
)
Energy Audit - For BusinessHome Energy Audit

Serving Mill Valley, CA and surrounding areas

In business since 1999

Emergency services offered

Credit card accepted

"We are so happy with our solar panels and knowing we are utilizing the sources naturally given to us to acquire energy. We are hoping to see the difference it will make on our bill. The team and company at Green NRG involved have made this process so easy and educational they have been incredible to work with. I can't say between the professionalism when I called with questions they were great. We would recommend you without hesitation as we are 110% satisfied."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+12

Recommended by90%of homeowners
Request Quote
Avatar for Attic Masters
Attic Masters
4.7(
33
)
Energy Audit - For BusinessHome Energy Audit

Serving Mill Valley, 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.
"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+7

Recommended by95%of homeowners
Request Quote
Avatar for Better Earth Construction
Better Earth Construction
5.0(
3
)
Home Energy Audit

Serving Mill Valley, CA and surrounding areas

In business since 2020

Free estimates

Credit card accepted

Better Earth is the South West's trusted energy expert. With years of experience in the trade, our company has the expertise to handle any project, big or small. Call today to learn more about our current service offerings!

Response time2 hrs
Response rate91%
Recommended by100%of homeowners
Request Quote
Showing 1-10 of 36
Energy Efficiency Auditing questions, answered by experts

Blower door tests are measured in a few different ways, but the most popular are air changes per hour (ACH) and cubic feet of air (CFM) moving through the house per hour. A good ACH score is less than 2ACH, but 1ACH is better. This means the house experiences a total air change within 60 minutes (for 1ACH). For 2ACH, there’s a complete change every 30 minutes, and so on. CFM scores are similar in that a lower score means less air change, and therefore less leakage.

Yes, skylights can affect a home’s energy efficiency, either positively or negatively. Properly installed, energy-efficient skylights with Low-E coatings, double glazing, and UV-blocking glass can help regulate indoor temperatures and reduce heating and cooling costs. However, poorly insulated or older skylights can contribute to heat loss in winter and excess heat gain in summer, lowering overall energy efficiency.

Yes, a dirty air filter can cause a higher electric bill. That’s because clogged filters make it harder for air to flow through your HVAC system, which forces it to work harder and use more energy. According to the U.S. Department of Energy, replacing dirty filters can save you between 5% and 15% in utility costs.

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.

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.

The Mill Valley, 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.

See all articles