Looking for an energy auditor in Duarte, CA? Describe your project once and up to three certified energy auditors who work in Duarte and Los Angeles County get back to you with a quote. It's free and there is no obligation.
Duarte is home to about 23,493 people (2024 Census Bureau estimate), a growing community (+8.1% since 2020). With 3,502 people per sq mi, it is a suburban area. Older homes and long heating or cooling seasons make energy audits worthwhile here.
Duarte at a glance
- Population (Census Bureau estimate, 2024)
- 23,493 (+8.1% since 2020)
- Rank in California
- 280th of 482 cities and towns
- Land area
- 6.7 sq mi
- Population density
- 3,502 people per sq mi (suburban)
- Type
- City (Duarte city)
- Main county
- Los Angeles County
What to check before hiring in Duarte
- 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 Duarte
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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 Duarte
How much does an energy audit cost in Duarte, CA?
It depends on the home and the tests. Describe your home: auditors who serve Duarte 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 Duarte 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.