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Top-Rated Energy efficiency auditors in Mountain View - Updated Nov 2026

Avatar for REenergizeCO, Inc.
REenergizeCO, Inc.
4.4(
151
)
Home Energy Audit

Serving Mountain View, CO and surrounding areas

Approved

In business since 2012

Free estimates

Warranties offered

"Scheduling an appointment for my home energy audit was easy. They had plenty of available times within the next week so that was great. They arrived on time and got right to work. I would hire them again."
 Insulation vs effective R-value
Existing attic insulation from 1970's Denver Home
 Attic blown to R49 with loose fill fiberglass
Thermal imaging picture of open interior wall
Picture from the attic looking at the open wall.

+2

Response time4 hrs
6 neighbors recently requested a quote
Recommended by96%of homeowners
Bestway Insulation, LLC
4.1(
286
)
Home Energy Audit

Serving Mountain View, CO and surrounding areas

Approved

In business since 1976

Free estimates

Emergency services offered

Home Pro of the Year in 2010 (Service Magic)Home Performance Contractor of the Year for the last 8 out of 10 years. We are a company that specializes in re-insulating existing homes by using blown-in insulation and getting huge reductions on our customers energy bills by Air Sealing and compressing fiberglass or rockwool in the walls and Dense packing it tight.Where most companies are happy getting 10%energy reductions on their clients homes, we want 50% or higher. Our family has owned and operated Bestway Insulation, LLC, in Colorado since 1976. Born & raised CO. Top Rebate producer for air sealing in 2009 - 2021. Home Performance with energy star Contractor of the year 21 out of 23 Years starting with NREL when they were doing it in 1996. I want huge results for my clients.

Response time1 day
20 neighbors recently requested a quote
Recommended by79%of homeowners
Avatar for Liberty Home Inspections, LLC
Liberty Home Inspections, LLC
5.0(
1
)
Home Energy Audit

Serving Mountain View, CO and surrounding areas

Approved

In business since 2016

Free estimates

Credit card accepted

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

Response time40 mins
Recommended by100%of homeowners
Avatar for G3 Services
G3 Services
New to Angi
Energy Audit - For BusinessHome Energy Audit

Serving Mountain View, CO and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

Welcome to [G3 Inspection Services, your trusted partner for professional home and business inspections. Whether you are purchasing a new home, selling a property, managing a commercial building, or simply want to understand the condition of your investment, our goal is simple: to provide you with clear, honest, and detailed information you can rely on.

1 neighbors recently requested a quote
Avatar for Energy Geeks, LLC
Energy Geeks, LLC
4.6(
28
)
Home Energy Audit

Serving Mountain View, CO and surrounding areas

In business since 2007

Free estimates

Warranties offered

"I contracted with Energy Geeks to perform an Energy Audit (highly recommended) as well as to blow in cellulose insulation in my attic. This is my first time working with a company on Home Advisor and I honestly couldn't be more pleased now that the work has been completed. Jason provided me with a comprehensive quote after our initial consultation and then took the time to review it with me. He also performed an Energy Audit on my home and explained what I could personally do to help the situation as well as what they'd be doing during the air sealing/insulation installation. This was all new to me so I appreciated that very much. The job was completed on Monday of this week and although it's been warmer than normal lately the difference was immediately noticeable. Energy Geeks even let me know that I qualified for an Xcel Energy rebate and they submitted the paperwork for me. If you're looking for a legit, honest company for your insulation needs these guys are it. The pricing was more than fair, the communication was top notch, and their professionalism was way more than I expected. I wish every contractor were like this!"
Air Sealing on Rim Joists
InsulWeb Dense Pack in progress
Insulweb Fiberglass Dense Pack
Energy Audit with Infrared Survey
Response time2 days
Recommended by95%of homeowners
Avatar for Simple Home Energy Solutions
Simple Home Energy Solutions
4.5(
67
)
Energy Audit - For BusinessHome Energy Audit

Serving Mountain View, CO and surrounding areas

In business since 2008

Free estimates

Credit card accepted

"I chose Simple Home Energy Solutions after getting several bids for doing spray foam in the attic. His experience was clearly superior to the other contractors. Robert identified several problems right away (missing insulation, mold in attic and squirrel nests) and was able to redo the insulation in the time frame I needed. He communicated with me throughout the process and made sure any problems we found were addressed. I would definitely work with him again for future insulation work."
Response time4 days
Recommended by96%of homeowners
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Energy Efficiency Auditing FAQs, 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.

If you want a new boiler that’s going to help lower your fuel bills, you should buy one that has a high energy-efficiency rating. For example, a boiler that is rated “A” uses at least 90% of the energy created by the boiler. And in order to enjoy the best performance, it’s important to have it installed properly by a highly-rated tech.

When combined with a substantial solar system, if you have enough Powerwalls, you could go off-grid and be energy independent. But remember, you'd need enough Powerwalls to power your whole home continuously because a single Powerwall can’t power large appliances for extended periods. One Powerwall is able to power an average-sized home's emergency circuits, lights, and outlets. To power large appliances, you likely need two or three Powerwalls.

Leaving vents open but closing doors in unused rooms will probably not save money on your energy bill. Closed doors prevent the natural flow of air throughout the home, which could reduce the efficiency of the overall HVAC system. They could also restrict airflow into and through the return vents, making the HVAC system less efficient.

Leaving lights on raises the electric bill, but not as much as having high-wattage light bulbs. The best way to save on electric costs is to swap your light bulbs to LED or CFL bulbs that use far fewer watts. You can also use smart lights and light switches to control usage via a smartphone or voice-controlled device.

The Mountain View, CO homeowners’ guide to energy efficiency auditing services

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