Top-rated energy efficiency auditors.

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There are 6 highly-rated local energy efficiency auditors.

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Avatar for Albert Nahman Plumbing, Heating, and Cooling

Albert Nahman Plumbing, Heating, and Cooling

4.45(
686
)
Approved Pro

Albert Nahman Plumbing, Heating, and Cooling

4.45(
686
)
Approved Pro
Customers say: Super punctual
698 local quotes requested
44 years of experience

Albert Nahman Services was founded in 1981 and has been serving Berkeley, CA and it surrounding areas in all their plumbing and HVAC needs. Each of our technicians went through rigorous training so we can guarantee that you will be receiving the proper service. We are also insured and supply a warranty for our parts for five years and up to twenty years on an re-piping or sewer replacement. Call us now to make your appointment!

"This project needed 2 people. My old refrigerator was extremely heavy. I took a photo and submitted it Angie’s list. I would of thought a large stainless steel fridge would almost impossible to move with only one pro. My only complaint is that my old fridge is sitting outside because it was too heavy and dangerous for the pro to move to the garage himself."

Shahan A on July 2023

Albert Nahman Services was founded in 1981 and has been serving Berkeley, CA and it surrounding areas in all their plumbing and HVAC needs. Each of our technicians went through rigorous training so we can guarantee that you will be receiving the proper service. We are also insured and supply a warranty for our parts for five years and up to twenty years on an re-piping or sewer replacement. Call us now to make your appointment!

"This project needed 2 people. My old refrigerator was extremely heavy. I took a photo and submitted it Angie’s list. I would of thought a large stainless steel fridge would almost impossible to move with only one pro. My only complaint is that my old fridge is sitting outside because it was too heavy and dangerous for the pro to move to the garage himself."

Shahan A on July 2023


Avatar for Smart Heating and Air Conditioning, Inc.

Smart Heating and Air Conditioning, Inc.

5.00(
12
)
Approved Pro

Smart Heating and Air Conditioning, Inc.

5.00(
12
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
106 local quotes requested

Smart Heating and Air Conditioning has what you need when it comes to AC Repair and Furnace Repair, with over 20+ years of experience. From small to large A/C Repair or Furnace Repair to routine maintenance, Smart Heating and Air Conditioning specializes in repair, service and maintenance of your home's Central Heating & Cooling, Ductwork, or Indoor Air Quality / Filtration. Not to mention Smart HVAC excellent equipment replacement and installations. Cities we service throughout Contra Costa and Alameda County include: Alameda, Alamo, Antioch, Berkeley, Brentwood, Clayton, Clyde, Concord, Danville, Diablo, Discovery Bay, Dublin, El Cerrito, Hayward, Hercules, Kensington, Lafayette, Livermore, Martinez, Montclair, Moraga, Oakland, Oakley, Orinda, Piedmont, Pittsburg, Pleasant Hill, Pleasanton, Rossmoor, San Ramon, San Leandro and Walnut Creek, CA. Call today for your free estimate on equipment.

"Came on time, did a lot of work, all clean, explained about the furnace and that all is ok."

MATT W on October 2025

Smart Heating and Air Conditioning has what you need when it comes to AC Repair and Furnace Repair, with over 20+ years of experience. From small to large A/C Repair or Furnace Repair to routine maintenance, Smart Heating and Air Conditioning specializes in repair, service and maintenance of your home's Central Heating & Cooling, Ductwork, or Indoor Air Quality / Filtration. Not to mention Smart HVAC excellent equipment replacement and installations. Cities we service throughout Contra Costa and Alameda County include: Alameda, Alamo, Antioch, Berkeley, Brentwood, Clayton, Clyde, Concord, Danville, Diablo, Discovery Bay, Dublin, El Cerrito, Hayward, Hercules, Kensington, Lafayette, Livermore, Martinez, Montclair, Moraga, Oakland, Oakley, Orinda, Piedmont, Pittsburg, Pleasant Hill, Pleasanton, Rossmoor, San Ramon, San Leandro and Walnut Creek, CA. Call today for your free estimate on equipment.

"Came on time, did a lot of work, all clean, explained about the furnace and that all is ok."

MATT W on October 2025


Avatar for Bell Brothers Plumbing Heating & Air

Bell Brothers Plumbing Heating & Air

4.66(
387
)
Approved Pro

Bell Brothers Plumbing Heating & Air

4.66(
387
)
Approved Pro
Customers say: Super punctual
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
50 local quotes requested

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023

We are locally owned and operated, and serving the Bay Area. Our focus is residential air conditioning, heating, Installation of HVAC systems and full-service plumbing. We love working with homeowners and helping to take care of their precious homes. We also keep busy doing light commercial service. Serving California since 1954, financing options available, We don't charge extra for Saturday service calls.

"Called this company for their $77 dollar, which they advertised with a flyer, for a tune-up and cleaning for my heating system. They are a Hayward company and I was told that our Castro Valley home was not in their service area. I bet if I called to buy a new heater they would be out in a day."

Gregory O on March 2023


Pinnacle Energy Solutions-Unlicensed Contractor

5.00(
1
)
Approved Pro

Pinnacle Energy Solutions-Unlicensed Contractor

5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
8 years of experience

Pinnacle Energy Solutions has become a staple of professionalism and quality work in San Ramon for years. With decades of experience, there is no job too large or small. Call today to schedule an appointment!

"The thing I appreciate with Steven is, there is no sales pitch! He paired us with best options we have and he always gets back and answers any questions we have to me! Just great!"

Greg N on August 2021

Pinnacle Energy Solutions has become a staple of professionalism and quality work in San Ramon for years. With decades of experience, there is no job too large or small. Call today to schedule an appointment!

"The thing I appreciate with Steven is, there is no sales pitch! He paired us with best options we have and he always gets back and answers any questions we have to me! Just great!"

Greg N on August 2021


Avatar for Posert Energy Consulting

Posert Energy Consulting

4.72(
44
)
Approved Pro

Posert Energy Consulting

4.72(
44
)
Approved Pro
Customers say: True professional
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
14 local quotes requested

At Posert Energy Consulting, we pride our company on reliability, great communication, integrity, and quality work. We strongly believe we can find the sources of high energy bills within an hour or two and set you on a path towards lower energy costs and energy independence. We are committed to eliminating greenhouse gas sources from residences as much as possible which includes our experience that about 2/3rd of the homes we visit have gas line leaks! We are experts, and will always keep you educated about the work process. We look forward to earning your business!

"Pete is fantastic! He called back promptly -- on a holiday -- and fit us in within 24 hrs. He did a home electrical audit, showed us how to read/interpret the smart meter and PG&E website re electrical usage, performed troubleshooting, and narrowed down the problem. Now we can hire an electrician because we know what the issue is! Great guy with a great personality and excellent customer service. Five out of five stars!!!!"

Jennifer L on May 2024

At Posert Energy Consulting, we pride our company on reliability, great communication, integrity, and quality work. We strongly believe we can find the sources of high energy bills within an hour or two and set you on a path towards lower energy costs and energy independence. We are committed to eliminating greenhouse gas sources from residences as much as possible which includes our experience that about 2/3rd of the homes we visit have gas line leaks! We are experts, and will always keep you educated about the work process. We look forward to earning your business!

"Pete is fantastic! He called back promptly -- on a holiday -- and fit us in within 24 hrs. He did a home electrical audit, showed us how to read/interpret the smart meter and PG&E website re electrical usage, performed troubleshooting, and narrowed down the problem. Now we can hire an electrician because we know what the issue is! Great guy with a great personality and excellent customer service. Five out of five stars!!!!"

Jennifer L on May 2024


Avatar for Apollo Energies

Apollo Energies

4.25(
2
)
Approved Pro

Apollo Energies

4.25(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
25 years of experience

We are independent energy consultants who reduced our own energy use and saved several hundreds of dollars monthly on our utility bill and made our homes more comfortable and now are helping others achieve similar results. We are not contractors. We do not get paid based on the recommendations we make or the recommendations you choose to do. We want to provide you with what you need to do, explain why you need to do it so that you have all the information you need to make an informed decision. Once you've made the decision on what you want to do, after having all the information necessary to make an informed decision, we will help you implement your decision. We have vetted many home performance contractors and we know they will do the quality work you want and deserve. There are PGE rebates available and financing available that we will show you how to leverage to your advantage. So give us a try. You'll be glad you did.

"Apollo did a fine job assessing my townhomes energy needs. The energy report covered what I needed."

Motiejus R on June 2019

We are independent energy consultants who reduced our own energy use and saved several hundreds of dollars monthly on our utility bill and made our homes more comfortable and now are helping others achieve similar results. We are not contractors. We do not get paid based on the recommendations we make or the recommendations you choose to do. We want to provide you with what you need to do, explain why you need to do it so that you have all the information you need to make an informed decision. Once you've made the decision on what you want to do, after having all the information necessary to make an informed decision, we will help you implement your decision. We have vetted many home performance contractors and we know they will do the quality work you want and deserve. There are PGE rebates available and financing available that we will show you how to leverage to your advantage. So give us a try. You'll be glad you did.

"Apollo did a fine job assessing my townhomes energy needs. The energy report covered what I needed."

Motiejus R on June 2019


Apricot Solar

No reviews yet

Apricot Solar

No reviews yet

With government assistance and access to the largest residential solar installer in the nation, at Apricot Solar we can provide every tool you need to produce you own energy and start saving money right away with zero upfront costs.

With government assistance and access to the largest residential solar installer in the nation, at Apricot Solar we can provide every tool you need to produce you own energy and start saving money right away with zero upfront costs.


Avatar for Paradigm Shift Solar

Paradigm Shift Solar

No reviews yet

Paradigm Shift Solar

No reviews yet
3 years of experience

With over 7 years experience, we work with 5 of the top, most highly rated solar installers in the country. Unlike other solar companies, we are able to work with you to get you up to 3 competitive quotes to compare. No need to waste hours consulting with multiple solar sales people. One conversation. Three quotes. Our process starts with a quick 15 minute discovery call to determine exactly how much solar you need for your home. No more. No less.

With over 7 years experience, we work with 5 of the top, most highly rated solar installers in the country. Unlike other solar companies, we are able to work with you to get you up to 3 competitive quotes to compare. No need to waste hours consulting with multiple solar sales people. One conversation. Three quotes. Our process starts with a quick 15 minute discovery call to determine exactly how much solar you need for your home. No more. No less.


Avatar for RSS Solar

RSS Solar

No reviews yet

RSS Solar

No reviews yet
Free onsite estimate

We make solar simple-- We are dedicated to making solar energy affordable and accessible to everyone-- with ZERO upfront costs.* Your home can become its own tiny power station and generate plenty of reliable energy, all while reducing your electricity bill. Plus, it doesn't hurt that your greener lifestyle will help your state achieve its renewable energy goals.

We make solar simple-- We are dedicated to making solar energy affordable and accessible to everyone-- with ZERO upfront costs.* Your home can become its own tiny power station and generate plenty of reliable energy, all while reducing your electricity bill. Plus, it doesn't hurt that your greener lifestyle will help your state achieve its renewable energy goals.


Powur Flawless Solar

No reviews yet

Powur Flawless Solar

No reviews yet

Powur delivers home energy solutions that save you money and lower your carbon footprint. Your solution to low cost, clean, reliable energy your family can depend on. Powur provides clean, reliable energy at significantly lower costs.

Powur delivers home energy solutions that save you money and lower your carbon footprint. Your solution to low cost, clean, reliable energy your family can depend on. Powur provides clean, reliable energy at significantly lower costs.

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Energy Efficiency Auditing questions, answered by experts

R-value is calculated by dividing the thickness of an insulation material by its thermal conductivity. The material's composition and density influence thermal conductivity. Materials with lower conductivity values provide better insulation. The higher the R-value, the better the material is at insulating, helping homeowners select insulation that meets the energy needs of their climate and home layout.

Insulation is measured by R-value, which is the measure of a material's ability to resist heat transfer. The higher the number, the better the insulation. When installing insulation yourself, you need to determine the optimal R-value you need to keep your home warm in the wintertime, cool in the heat of summer, and energy-efficient all year long. Each inch of insulation provides between a 3 and an 8 R-value. The climate where you live plays a major role in what R-value you need and the price tag you might see in your insulation installation.

Absolutely! Especially if you have an older home that currently doesn’t have air conditioning where installing ductwork just wouldn't work. No one likes being hot in the warmer months, so if you’re looking to sell your home in the near future, installing a ductless mini-split AC can be a good way to enjoy your home more while you’re in it, boost the return on your sale, and serve as a perk to peak buyers’ interest.

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.

Smart glass doesn’t use a lot of electricity, and you can expect a standard window to add between $1 and $2 per year to your electric bills. Smart glass is proof that energy-efficient windows work. Although your smart windows may consume a little energy to operate, they can save enough energy to offset the costs. If you’re concerned about the minimal bump to your electricity consumption, you can opt for smart tint, which doesn’t require electricity to work.

The Castro 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.

What do you need done? We’ll find top pros.
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  • 🏠 "Repair shingles on an asphalt roof"