HERS Testing & Your HVAC Project
HERS is the step that catches the difference between a system that was installed and a system that was installed correctly. Here's the plain-English version.
What HERS is
HERS verification is third-party testing tied to California's energy code. An independent rater — not your contractor — measures whether specific parts of the installation actually perform as claimed. The independence is the point: your contractor doesn't grade their own work.
What it tends to look at
- Duct leakage
- Refrigerant charge and airflow on the installed system
- Other measures tied to the specific work performed
Why it's worth having
Duct leakage and an incorrect charge are two of the most common reasons a brand-new system underperforms. A test that catches them protects the money you just spent — and gives you documentation that the job met the standard.
How we handle it
When your project requires HERS, we handle that process and coordinate the job through inspection along with the permit. You don't have to schedule a rater or chase paperwork.
Last reviewed: September 2026 · Reviewed by: Briton Davis, owner, Cool Guys Home Services (CA CSLB #1156890) · Re-reviewed on each California Energy Code (Title 24, Part 6) update cycle
General education, not legal advice. Which measures require HERS verification depends on the work and the current energy code — confirm with your building department or your contractor's compliance documents.
What we're not going to guess at
Which specific measures trigger HERS verification, and the current fee and timeline for a rater in each of our jurisdictions, are being verified before we publish them.
Common questions
Does Cool Guys handle HERS testing?
Yes. We handle the HERS process when it's required for your project, along with the permit and inspection coordination.
Does every job need HERS testing?
No — it depends on the work being performed and your jurisdiction. We confirm whether yours requires it during the free estimate.
Who performs the test?
An independent third-party HERS rater, not the installing contractor. That independence is what makes the verification meaningful.
Reviewed by Briton Davis, owner, and the Cool Guys Home Services service team · Licensed, bonded & insured (CSLB #1156890)
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