California Homes Have a Secret Weapon for Energy Savings And Most People Don’t Even Know It Exists. Ever heard of a HERS test?
If your answer is “barely,” “sort of,” or “is that a medical thing?” you’re not alone. But if you live in California and you’re building, remodeling, or replacing an HVAC system, this little test is about to become a very big deal. Here’s the scoop: HERS stands for Home Energy Rating System. And a HERS test is the key to unlocking energy savings, passing inspections, and avoiding massive headaches with state compliance.
Let’s break it down in human-speak.
What Is a HERS Test, Really?
A HERS test is an inspection that measures how energy efficient your home is—especially when it comes to your heating, ventilation, and air conditioning (HVAC) system. It’s required under Title 24 of California’s building code, and it applies to a wide range of projects, including:
- HVAC system replacements
- New builds or home additions
- Remodels that impact ductwork or insulation
- Home performance upgrades
The test must be performed by a certified third-party home energy consultant, not your HVAC installer. This ensures accuracy and fairness in the results.
It’s like a report card for your home’s energy use. And in California? You don’t graduate (i.e., get your permit signed off) without it.
Why Does California Require It?
Because energy efficiency isn’t just good for the planet—it’s great for your wallet. And California takes energy use seriously.
By enforcing HERS testing through Title 24, the state ensures that:
- Homes meet minimum energy efficiency standards
- HVAC systems perform as they should
- Ducts aren’t leaking conditioned air into unconditioned spaces
- Insulation is properly installed
It’s all about smarter energy use. And smarter homes.
What Does a HERS Test Include?
Depending on your project, a HERS rater (aka certified energy efficiency consultant) might perform one or more of the following:
- Duct Leakage Testing: Checks for air escaping your ductwork.
- Airflow & Fan Watt Draw Testing: Measures how efficiently your HVAC fan operates.
- Refrigerant Charge Verification: Ensures your AC system is charged correctly.
- QII Verification (Quality Insulation Installation): Makes sure your insulation is up to standard.
- Blower Door Testing: Assesses how airtight your home is overall.
Each test is tailored to your specific project and HVAC setup. And once the test is passed, you’ll get a compliance certificate to submit to the local building authority.
What Happens If You Skip It?
Short answer: you can’t.
If your project triggers a HERS requirement, you must complete the test to pass inspection. No certificate = no final permit = no legal sign-off.
But even beyond the red tape, skipping this test means you risk:
- Running an inefficient HVAC system
- Higher monthly utility bills
- Poor home comfort
- Shortened equipment life
- Missed rebate opportunities
When done properly, a HERS test gives you peace of mind and long-term savings. It’s not just a compliance checkbox it’s a smart investment in your home’s performance.
How Much Does a HERS Test Cost?
Costs vary depending on the size of the home and number of tests required, but typically range from $200–$500.
Some projects (like full new construction) require more comprehensive testing, while a simple HVAC changeout may only need a duct leakage test and airflow verification.
The good news? When you hire a reliable home energy consultant like Innovative Energy Solutions, you’ll get clear pricing, efficient service, and all the documentation you need to keep your project on track.
When Should You Schedule It?
Timing is everything.
- If you’re replacing an HVAC unit, schedule the HERS test after installation but before final inspection.
- If you’re building new, coordinate early with your HVAC contractor and your HERS rater to avoid delays.
- If you’re remodeling, check your permit requirements your project might trigger the need even if you’re not touching the HVAC.
A great energy efficiency consultant will help you plan this out so there are no surprises.
Who Performs the HERS Test?
Only a certified, third-party HERS rater can perform these tests in California. They must be trained and accredited through a recognized provider like CHEERS or CalCERTS. At Innovative Energy Solutions, our licensed experts are certified and ready to help. We’ve worked with thousands of homeowners, builders, and HVAC contractors to make Title 24 compliance as smooth and stress-free as possible.
We bring fast testing, clear reports, and helpful guidance so your project can move forward without the back-and-forth.
Why Every Homeowner Should Care Even If You’re Not Remodeling
Think a HERS test is only for construction projects? Think again.
Getting a voluntary HERS test (yes, that’s a thing) can give you insight into:
- Where your home is wasting energy
- Which upgrades would have the biggest payoff
- How to qualify for rebates or green home certifications
- What changes to make before listing your home
In fact, many real estate pros now recommend HERS ratings to help buyers and sellers understand a property’s efficiency kind of like a CARFAX for your house.
FAQs
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What does “HERS” stand for?
HERS = Home Energy Rating System. It’s a state-regulated method for evaluating home energy efficiency.
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Do I need a HERS test for my HVAC replacement?
Yes. In California, most HVAC replacements require at least a duct leakage test and airflow verification.
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How long does a HERS test take?
Most single-system tests take 45 minutes to 1.5 hours, depending on your setup and what’s being tested.
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Can my HVAC contractor perform the HERS test?
Nope. The test must be done by a third-party HERS rater to avoid conflict of interest.
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Is a HERS rating the same as a HERS test?
Not quite. A HERS rating is a full home energy score (usually done for new construction or green certifications). A HERS test refers to specific inspections required for compliance.
Wrap-Up: HERS Isn’t Just a Test. It’s a Game Plan.
If you’re building, renovating, or simply trying to be smarter about your energy use, a HERS test isn’t a bureaucratic burden it’s your guide. It tells you where you stand, what you need, and how to avoid problems before they cost you time, money, or comfort.
So the next time you hear “What is a HERS test?” you’ll know the answer. It’s the unsung hero of home efficiency. And in California, it’s non-negotiable.
Need an HVAC HERS Test in the San Francisco Bay Area?
Innovative Energy Solutions provides certified testing, compliance assistance, and expert advice fast, affordable, and stress-free. Let’s get your project certified.
