Learn how you can take advantage of Dominion Energy incentives, IRA rebates, and Virginia Energy programs!

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Lower energy costs without sacrificing comfort

Stay cool and save energy this summer!

Welcome to the Fifth Fuel

The Fifth Fuel is a locally owned and operated contractor with over 30 years of experience in home performance. Our team is highly skilled and certified to bring energy efficiency solutions throughout Metro Maryland, Northern Virginia, and DC. The Fifth Fuel’s services are designed to make homes and businesses more efficient and durable, providing years of benefits including:

  • Improved indoor air quality
  • Better home comfort
  • Longer HVAC lifespan
  • Energy savings
  • Lower heating & cooling costs

We believe that energy efficiency is the fifth fuel, and strive to help solve your home’s performance issues while also lowering your carbon emissions. There are many ways to save energy and our team is dedicated to helping you find the right one for you. We can help you find rebates and incentives to make upgrades more affordable.

Your local home efficiency experts.

Get in touch with our team today!


Energy Audit

A home energy audit should always be the first step to making home performance upgrades. The professional energy audits from The Fifth Fuel assess your energy consumption, expose inefficiencies, and identify energy-saving opportunities that will have the biggest impact on your comfort and efficiency.

Air Sealing

Air sealing is the most cost-effective way to boost home comfort and indoor air quality while promoting long-term home energy conservation and efficiency. 


Insulation prevents the transfer of heat into and out of your home, lowering your heating and cooling costs while making your home more comfortable all year round. The Fifth Fuel offers a variety of insulation services, including spray foam insulation, attic insulation, insulation removal, and more.


Many older homes were not built to the same performance standards we have today, causing them to suffer from heat loss, moisture intrusion, and other issues that can affect your comfort and health. The Fifth Fuel retrofits existing homes and commercial buildings to improve these inefficiencies with services like crawl space encapsulation and insulation.

Your Local Home Efficiency Experts

The team at The Fifth Fuel uses building science expertise to solve home comfort, health, and efficiency issues. Our services provide long-lasting solutions that lower your carbon footprint. 

Air Sealing

Air leaks can significantly impact your home’s energy efficiency, causing uneven temperatures and costly heating and cooling bills. With blower door testing from The Fifth Fuel, we can pinpoint exactly where your home is losing energy and air seal with accuracy.


Insulation can provide benefits to your home all year round—not only in the winter. The Fifth Fuel uses infrared cameras to determine areas in your home that are underinsulated before removing old insulation, air sealing, and installing new insulation in your walls or attic.


Energy-focused retrofits can drastically increase the performance in older and historic homes. The Fifth Fuel can help you preserve your home’s charm, while also making it more comfortable and efficient. It all starts with a home energy assessment.

Why Air Sealing & Insulation Go Hand in Hand

Why Air Sealing & Insulation Go Hand in Hand

We experience a wide range of temperatures throughout the year…

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5 Benefits of Crawlspace Encapsulation 

5 Benefits of Crawlspace Encapsulation 

Crawlspaces are an often overlooked part of a home and…

What’s the Best Kind of Insulation for My Attic? 

What’s the Best Kind of Insulation for My Attic? 

(Downloadable PDF) Attic insulation is one of the most cost-effective…

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State of Virginia Licensed Contractor
Air Barrier Association of America