If you’re planning to replace or upgrade your HVAC system in California, there’s a good chance you’ve heard of HERS testing—but maybe not in detail. HERS (Home Energy Rating System) testing is a state-mandated inspection that ensures your system meets California’s strict energy efficiency standards. Passing this test isn’t optional; it’s required for final permit approval and long-term comfort.
Failing a HERS inspection can mean costly delays, rework, and frustration. But with the right knowledge—and the right contractor—you can sail through the process. At Brewer Heating & Air Conditioning, we help homeowners across Grass Valley and surrounding areas understand, prepare for, and pass their HERS test the first time.
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TLDR – Quick Guide
- HERS testing is a state-mandated inspection for HVAC system upgrades and replacements.
- It checks your ductwork, airflow, refrigerant charge, and energy compliance.
- Failing the test delays final sign-off and may require system modifications.
- Working with a licensed HVAC contractor ensures you meet all HERS criteria.
- Brewer Heating & Air Conditioning ensures systems are installed to pass inspection the first time.
Implementation Tactics: How to Prepare for and Pass HERS Testing
What Is HERS Testing?
HERS testing (Home Energy Rating System) is a required third-party inspection process regulated by the California Energy Commission. It verifies that new or upgraded HVAC systems meet energy efficiency standards as set by Title 24 of the California Energy Code.
Key elements tested include:
- Duct leakage (ensuring air isn’t lost in unconditioned spaces)
- Refrigerant charge (making sure cooling systems are properly filled)
- Airflow (verifying your system delivers the correct volume of air)
- Fan watt draw and static pressure (ensuring energy efficiency and airflow balance)
These tests ensure that homeowners are not only compliant with state law but are also getting the performance and efficiency they paid for.
Why HERS Testing Is Required in California
The purpose of HERS testing is to prevent energy waste and ensure HVAC systems are installed correctly. California experiences high temperatures and energy loads, especially in regions like Grass Valley, which puts more demand on air conditioning systems.
Without proper testing:
- Duct leaks can waste 20-30% of cooled or heated air
- Improper refrigerant levels reduce system life and efficiency
- Poor airflow affects comfort and increases utility bills
The state requires HERS inspections for all new HVAC installations, duct replacements, and major system upgrades to hold both contractors and systems accountable.
Common Reasons Homeowners Fail HERS Tests
Most HERS failures come down to installation errors or overlooked details. Common issues include:
- Duct leakage exceeding allowed thresholds
- Improper refrigerant charge
- Insufficient airflow from supply vents
- Unsealed or damaged ductwork
These failures often require rework and retesting—meaning more time, more cost, and more frustration. Choosing an experienced HVAC contractor from the start makes a difference.
How to Pass HERS Testing the First Time
The best way to pass a HERS test is to work with a contractor who understands and plans for it from day one. At Brewer Heating & Air Conditioning, all new system installations are done with Title 24 compliance in mind.
To improve your odds:
- Hire a licensed contractor familiar with HERS compliance
- Ensure ductwork is sealed properly and airflow is calculated accurately
- Request a system design review before installation begins
- Use high-efficiency equipment that meets or exceeds state standards
We also offer system types that are more likely to pass inspections on the first try, such as ductless mini-split systems or high-efficiency heat pumps.
What Happens After a HERS Test?
Once your HERS rater completes the inspection, they submit the results to the California Energy Commission’s HERS registry. If you pass, the city or county inspector can finalize your permit. If you fail, the contractor must fix the issues and schedule a re-test.
At Brewer Heating & Air Conditioning, we aim to make this process seamless. Our team coordinates with certified HERS raters and ensures every install meets the current code—so you don’t have to stress about retests or delays.
Key Takeaways
- HERS testing is a required part of HVAC system upgrades in California to ensure energy efficiency and code compliance.
- It measures duct leakage, airflow, refrigerant levels, and system performance.
- Failing the test can lead to costly rework and delayed permit approvals.
- Choosing a knowledgeable contractor like Brewer Heating & Air Conditioning is the best way to ensure your system passes the first time.
- Proper system design, sealed ductwork, and state-compliant equipment are key to success.
FAQs
What does HERS testing include?
HERS testing includes inspections of duct leakage, airflow, refrigerant charge, and fan watt draw. These tests ensure your system meets California energy code standards. It’s required for most HVAC installations or upgrades.
Who performs the HERS test?
A certified third-party HERS rater conducts the test, separate from your contractor. This ensures impartial results and compliance with state law. Your HVAC provider will typically help coordinate the appointment.
How much does a HERS test cost?
HERS testing typically costs between $200 and $400, depending on system complexity and number of tests required. Some projects may involve multiple tests (e.g., duct sealing and refrigerant charge verification). Ask your contractor whether the test is included in your overall installation cost.
What if I fail a HERS test?
If your system doesn’t meet the required standards, it must be corrected and re-tested. Failing can delay your permit and increase overall project costs. Working with a qualified installer greatly reduces the risk of failure.
Do all HVAC projects require HERS testing?
Not every HVAC project requires testing, but most replacements, ductwork changes, and new installations do. Minor repairs or maintenance usually don’t require it. Your contractor should tell you if your project triggers HERS compliance.