Need an energy audit or a HERS rating in Fairfax County, VA? Fairfax County has about 1,160,925 residents (2024 estimate) and 3 incorporated cities and towns. Describe your project once: certified energy auditors who work in Fairfax County get back to you.
Utilities serving Fairfax County may offer audit and upgrade programs.
Services available in Fairfax County
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Home energy audit
Whole-home assessment with blower door test and infrared scan, with a prioritized list of upgrades.
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HERS rating
HERS Index rating of a new or existing home by a RESNET-certified rater, for code compliance or programs.
Frequently asked questions in Fairfax County
Do certified energy auditors cover the whole of Fairfax County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Home Energy Audits in Virginia: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.