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  • Average homeowner rating star icon4.3
    Average homeowner rating
  • Verified reviews icon70
    Verified energy efficiency auditing services reviews

Find Energy efficiency auditors in Lansdowne

"I’ve been a loyal Snell customer for years, but this recent experience was deeply disappointing. After our AC failed in August, Snell diagnosed a leaking evaporator coil. We chose to replace the system through them, and the salesperson took time to evaluate the setup in advance. However, on installation day, the crew arrived without the correct ductwork and had to make adjustments on the fly. Unfortunately, the adjustments were poorly executed: • The Aprilaire humidifier was mounted on sloped ductwork rather than a level surface, contrary to manufacturer specifications. • The hole for the humidifier was cut inaccurately. • The drain line was left kinked in multiple places. Aprilaire support later confirmed the humidifier was not installed correctly and warned this could lead to water backing up into the system — a concern I had raised with the installers before they left. Despite multiple follow-up attempts, I received no meaningful response. I was told my concerns would be escalated, but no one followed through. This was a major investment, and I now feel I need to bring in another HVAC team to correct issues that should have been resolved from the start. I’ve recommended Snell in the past, but I can’t in good faith do so now after this experience."

Will H on September 2025

Family owned & operated. Financing available. Credit cards. All work done by experienced professionals to ensure consistent high quality. Award winning company at your service.

"I’ve been a loyal Snell customer for years, but this recent experience was deeply disappointing. After our AC failed in August, Snell diagnosed a leaking evaporator coil. We chose to replace the system through them, and the salesperson took time to evaluate the setup in advance. However, on installation day, the crew arrived without the correct ductwork and had to make adjustments on the fly. Unfortunately, the adjustments were poorly executed: • The Aprilaire humidifier was mounted on sloped ductwork rather than a level surface, contrary to manufacturer specifications. • The hole for the humidifier was cut inaccurately. • The drain line was left kinked in multiple places. Aprilaire support later confirmed the humidifier was not installed correctly and warned this could lead to water backing up into the system — a concern I had raised with the installers before they left. Despite multiple follow-up attempts, I received no meaningful response. I was told my concerns would be escalated, but no one followed through. This was a major investment, and I now feel I need to bring in another HVAC team to correct issues that should have been resolved from the start. I’ve recommended Snell in the past, but I can’t in good faith do so now after this experience."

Will H on September 2025


Avatar for Founders Insulation

Founders Insulation

4.93(
15
)
Approved Pro

Founders Insulation

4.93(
15
)
Approved Pro
Super Service Award
Customers say: Quick response
254 local quotes requested
3 years of experience

Founders Insulation, is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"From initial contact to site visit to quotation service and follow-up, Brian and team at Founders Insulation provided an easygoing and excellent experience. They were able to accommodate our insane schedule when they had an unexpected opening, and did fantastic work, adding some essential services just the day before they arrived. Will work with them again in a heartbeat. Before, during and after photos attached."

Chris O on November 2025

Founders Insulation, is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"From initial contact to site visit to quotation service and follow-up, Brian and team at Founders Insulation provided an easygoing and excellent experience. They were able to accommodate our insane schedule when they had an unexpected opening, and did fantastic work, adding some essential services just the day before they arrived. Will work with them again in a heartbeat. Before, during and after photos attached."

Chris O on November 2025


Avatar for 3 PROS Basement System

3 PROS Basement System

4.52(
22
)
Approved Pro

3 PROS Basement System

4.52(
22
)
Approved Pro
Customers say: Quick response
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
86 local quotes requested

3 Pros Basement Systems uses proven basement waterproofing, sump pump and crawl space encapsulation solutions to help eliminate wet basements and nasty crawl spaces. We can help make the air in your home drier, healthier and more comfortable. We offer free inspections and will focus on the science of your home to design a project to improve wet basements, cold floors, drafty rooms, nasty crawl spaces and high energy bills. We have worked in 1000's of homes across Northern Virginia and West Virginia and always enjoy clients who call us days after service to let us know how much they can feel the differences in their home.

"great"

Qasim M on May 2023

3 Pros Basement Systems uses proven basement waterproofing, sump pump and crawl space encapsulation solutions to help eliminate wet basements and nasty crawl spaces. We can help make the air in your home drier, healthier and more comfortable. We offer free inspections and will focus on the science of your home to design a project to improve wet basements, cold floors, drafty rooms, nasty crawl spaces and high energy bills. We have worked in 1000's of homes across Northern Virginia and West Virginia and always enjoy clients who call us days after service to let us know how much they can feel the differences in their home.

"great"

Qasim M on May 2023


Avatar for Earth Right Mid-Atlantic

Earth Right Mid-Atlantic

5.00(
12
)
Approved Pro

Earth Right Mid-Atlantic

5.00(
12
)
Approved Pro
Customers say: Quality work
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers
27 local quotes requested

Earth Right Mid-Atlantic is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 15 years of hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today! We are 5 star Google rated, 5 star Facebook rated, and have recently won Best Alternative Energy company in Central Virginia through the readers choice awards!

"We recently installed a solar shield, solar attic fans, and 30 solar panels on our home. We are so happy with everything! From the first time we sat done with Shane Durie, to the installation, to the time it was switched on. They were very polite, professional, knowledgeable and respectful of our property. They even took care of permits and HOA approval. If anyone is looking for someone to install solar panels, give them a call, you will be happy you did. 5â­ ï¸ â­ ï¸ â­ ï¸ â­ ï¸ â­ ï¸"

Leo D on February 2022

Earth Right Mid-Atlantic is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 15 years of hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today! We are 5 star Google rated, 5 star Facebook rated, and have recently won Best Alternative Energy company in Central Virginia through the readers choice awards!

"We recently installed a solar shield, solar attic fans, and 30 solar panels on our home. We are so happy with everything! From the first time we sat done with Shane Durie, to the installation, to the time it was switched on. They were very polite, professional, knowledgeable and respectful of our property. They even took care of permits and HOA approval. If anyone is looking for someone to install solar panels, give them a call, you will be happy you did. 5â­ ï¸ â­ ï¸ â­ ï¸ â­ ï¸ â­ ï¸"

Leo D on February 2022


Avatar for HomeGuard Foam & Foundation

HomeGuard Foam & Foundation

4.73(
23
)
Approved Pro

HomeGuard Foam & Foundation

4.73(
23
)
Approved Pro
Customers say: Quality work
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers
80 local quotes requested

Committed to creating energy-efficient, durable homes. We take pride in doing things the right way, specializing in spray foam insulation, crawl space solutions, insulation, foundation repair, and waterproofing. Our expert team protects homes from water damage, foundation issues, and energy loss, ensuring lasting comfort and structural integrity for homeowners.

"Installer put hole through ceiling and they wonâ t accept responsibility for it. They said they didnâ t do it. I was sitting in room when it happened. Not trustworthy. ð"

Virginia L on November 2023

Committed to creating energy-efficient, durable homes. We take pride in doing things the right way, specializing in spray foam insulation, crawl space solutions, insulation, foundation repair, and waterproofing. Our expert team protects homes from water damage, foundation issues, and energy loss, ensuring lasting comfort and structural integrity for homeowners.

"Installer put hole through ceiling and they wonâ t accept responsibility for it. They said they didnâ t do it. I was sitting in room when it happened. Not trustworthy. ð"

Virginia L on November 2023


Avatar for Relax HVAC, Inc.

Relax HVAC, Inc.

5.00(
28
)
Approved Pro

Relax HVAC, Inc.

5.00(
28
)
Approved Pro
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
97 local quotes requested

Relax HVAC, Inc. is a fully insured and licensed heating and air conditioning firm in Ashburn, Virginia, composed of Master Technicians led by Kamal. He and his team provide round-the-clock emergency services for residential and commercial customers, including those in the Iranian, Arabic, and Palestinian communities. With more than 25 years of experience in providing air conditioning services, Kamal takes pride in making customers feel good about his company. He does this by giving them quality and honest services at great prices. His services are approved and recommended by the Loudoun County Fire Department.

"My AC failed and I had limited time to find a good solution, I made a phone call to Relax HVAC based on the online reviews and it was a great decision. Nasser came to check the situation, he gave a very detailed and comprehensive overview of the situation and provided with the options I had. I decided to replace the unit, Nasser went above and beyond to find a unit delivery service but there was nothing available over the weekend so this gentleman went for unit pick up himself and finished the installation within a day from my initial call. Moreover, the provided price was very reasonable.I can't be more happy with the outcome and highly recommend Relax HVAC"

Navid P on July 2024

Relax HVAC, Inc. is a fully insured and licensed heating and air conditioning firm in Ashburn, Virginia, composed of Master Technicians led by Kamal. He and his team provide round-the-clock emergency services for residential and commercial customers, including those in the Iranian, Arabic, and Palestinian communities. With more than 25 years of experience in providing air conditioning services, Kamal takes pride in making customers feel good about his company. He does this by giving them quality and honest services at great prices. His services are approved and recommended by the Loudoun County Fire Department.

"My AC failed and I had limited time to find a good solution, I made a phone call to Relax HVAC based on the online reviews and it was a great decision. Nasser came to check the situation, he gave a very detailed and comprehensive overview of the situation and provided with the options I had. I decided to replace the unit, Nasser went above and beyond to find a unit delivery service but there was nothing available over the weekend so this gentleman went for unit pick up himself and finished the installation within a day from my initial call. Moreover, the provided price was very reasonable.I can't be more happy with the outcome and highly recommend Relax HVAC"

Navid P on July 2024


Avatar for Comfenergy

Comfenergy

4.29(
33
)
Approved Pro

Comfenergy

4.29(
33
)
Approved Pro
Customers say: Quick response
103 local quotes requested
12 years of experience

Comfenergy is a locally owned & operated Insulation Contractor. We focus on home comfort and energy efficiency. We specialize in residential & commercial solutions designed to improve the overall comfort, health and energy efficiency of the home or office. As a full-service home insulation contractor we start by conducting a comprehensive home comfort and energy evaluation to identify and locate all the energy losses and weaknesses throughout your building. After the testing, we are able to put together a prioritized list of the most cost-effective solutions to correct comfort and energy wasting issues. From there we leave the decision making entirely up to you, letting you pick which home improvements you would like applied to your home. Our main goal is to focus on the most important needs of your building?. Why insulate the garage walls if all of your conditioned air is being lost to the attic? Call for a free estimate in insulation or air sealing solutions.

"They were great."

Laura O on May 2024

Comfenergy is a locally owned & operated Insulation Contractor. We focus on home comfort and energy efficiency. We specialize in residential & commercial solutions designed to improve the overall comfort, health and energy efficiency of the home or office. As a full-service home insulation contractor we start by conducting a comprehensive home comfort and energy evaluation to identify and locate all the energy losses and weaknesses throughout your building. After the testing, we are able to put together a prioritized list of the most cost-effective solutions to correct comfort and energy wasting issues. From there we leave the decision making entirely up to you, letting you pick which home improvements you would like applied to your home. Our main goal is to focus on the most important needs of your building?. Why insulate the garage walls if all of your conditioned air is being lost to the attic? Call for a free estimate in insulation or air sealing solutions.

"They were great."

Laura O on May 2024


Avatar for United Solar

United Solar

No reviews yet

United Solar

No reviews yet

If you're looking to save money, stop renting your electricity from your electric company and take control of your monthly electric bill- solar can help! With great warranties, completely virtual and free consultations, we can evaluate your house, your needs and what solar will look like for you to see if its a good fit! Solar is growing and more and more people are reaping the finial benefits of solar every day. Contact me to see what solar would look like for you!

If you're looking to save money, stop renting your electricity from your electric company and take control of your monthly electric bill- solar can help! With great warranties, completely virtual and free consultations, we can evaluate your house, your needs and what solar will look like for you to see if its a good fit! Solar is growing and more and more people are reaping the finial benefits of solar every day. Contact me to see what solar would look like for you!


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.


TPG Home Inspections, LLC

No reviews yet

TPG Home Inspections, LLC

No reviews yet
5 years of experience

Complete Home Inspection and Consulting Services INSPECTION SERVICES: Home Buyer Seller Pre-Listing Baltimore Rental Townhouse/Condo/Duplex Pre-Drywall Repair Verification Green Building ANCILLARY SERVICES: Home Energy Score Thermal Imaging Home Energy Report Indoor Air Quality Radon Testing This is a veteran owned business bringing 30+ years of building and engineering experience to serve you!

Complete Home Inspection and Consulting Services INSPECTION SERVICES: Home Buyer Seller Pre-Listing Baltimore Rental Townhouse/Condo/Duplex Pre-Drywall Repair Verification Green Building ANCILLARY SERVICES: Home Energy Score Thermal Imaging Home Energy Report Indoor Air Quality Radon Testing This is a veteran owned business bringing 30+ years of building and engineering experience to serve you!

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Energy Efficiency Auditing questions, answered by experts

Keep the unit full but not overloaded, ensure door seals are tight, set correct temperatures, and avoid frequent door openings. Position the appliance away from heat sources for optimal performance.

Generator size requirements vary wildly among properties, but typical generator sizes are listed below based on home square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14kW

  • 2,500 sq ft: 12–16kW

  • 3,000 sq ft: 16–20kW+

Unfortunately, home square footage isn’t always a good indicator of generator size requirements. Instead, you should call in a professional to discuss which items in your home you’d like to run via your generator. They can calculate peak and average consumption for those items and then size your generator appropriately for optimal performance.

ENERGY STAR®-certified windows are the most energy-efficient windows on the market. This certification means that the window meets strict efficiency guidelines set forth by the Environmental Protection Agency. While they might cost more upfront, they can save you money on your energy bills in the long run. ENERGY STAR®-certified windows lower household energy bills by an average of 12% annually.

Yes, energy-efficient windows really can make a difference. As long as energy-efficient windows are properly installed and maintained, they can reduce your energy bill and offer significant savings.

Depending on property size and audit scope, costs range from $200 to $600.

The Lansdowne, VA homeowners’ guide to energy efficiency auditing services

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