Need an energy audit or a HERS rating in New Castle County, DE? New Castle County has about 588,093 residents (2024 estimate) and 13 incorporated cities and towns. Describe your project once: certified energy auditors who work in New Castle County get back to you.
Utilities serving New Castle County may offer audit and upgrade programs.
Services available in New Castle 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 New Castle County
Do certified energy auditors cover the whole of New Castle 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 Delaware: 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.