Looking for an energy auditor in Napa, CA? Describe your project once and up to three certified energy auditors who work in Napa and Napa County get back to you with a quote. It's free and there is no obligation.
Napa is home to about 76,921 people (2024 Census Bureau estimate), a shrinking community (−3.0% since 2020). With 4,261 people per sq mi, it is a densely built-up area. Older homes and long heating or cooling seasons make energy audits worthwhile here.
Napa at a glance
- Population (Census Bureau estimate, 2024)
- 76,921 (−3.0% since 2020)
- Rank in California
- 115th of 482 cities and towns
- Land area
- 18 sq mi
- Population density
- 4,261 people per sq mi (densely built-up)
- Type
- City (Napa city)
- Main county
- Napa County
What to check before hiring in Napa
- Certification: choose a RESNET or BPI certified professional.
- Rebates: in California, check your utility's programs before booking: some require their own approved auditors.
- Test-in, test-out: a blower door test before and after upgrades shows the result.
- Price drivers: home size, tests included and report detail.
Useful official resources
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ENERGY STAR
Energy efficiency guidance for homes.
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RESNET
Find a certified HERS rater.
Services available in Napa
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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 Napa
How much does an energy audit cost in Napa, CA?
It depends on the home and the tests. Describe your home: auditors who serve Napa reply with a quote.
How long does it take?
Usually two to four hours on site.
Will the auditor sell me upgrades?
Some do; an independent auditor gives a neutral list.
Which certified energy auditors will contact me?
Up to three independent certified energy auditors who serve Napa and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
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.