When buyers start shopping for a new home, they usually focus on what they can see first. The kitchen has to feel right. The layout has to work. The finishes have to feel like home. We understand that. But once move-in day passes, everyday life starts to reveal the difference between a house that looks good and a house that truly performs.
That difference matters even more now because U.S. residential electricity prices rose from 13.15 cents per kilowatt-hour in 2020 to 17.30 cents in 2025. When energy costs keep climbing, vague promises about efficiency stop feeling harmless and start affecting your monthly budget. That is why the phrase “energy efficient” deserves a closer look.
The truth is that “energy efficient” can mean very different things depending on who is saying it. One builder may use it to describe a home that is only slightly better than code. Another may use it to describe a home built to the DOE Zero Energy Ready Home standard, now carried forward under the DOE Efficient New Homes program, with third-party verification and much more demanding performance requirements. For buyers in Delaware and nearby Maryland, that difference matters. At Insight Homes, we believe confidence should come from proof, not just a promise.
Key Takeaways
- “Energy efficient” is not proof. Certifications, testing and verification are what matter.
- A few upgraded features do not make a home truly high-performance.
- The HERS score gives buyers a real number to compare, not just a marketing claim.
- Greenwashing often sounds polished, but it falls apart when buyers ask for specifics.
- Solar alone does not define performance. The whole home has to work as a system.
- Insight Homes backs its claims with measurable proof, not vague promises.
“Energy Efficient” Is Not a Certification
One of the biggest misconceptions in home building is that “energy efficient” is a category by itself. It is not. It is a broad phrase, and without context, it can mean almost anything.
That is where many buyers get stuck. A builder may mention upgraded insulation, a high-efficiency HVAC system or even solar panels, and on the surface, that all sounds encouraging. But a few features do not tell the full story. A home performs better when the entire house is designed as a single system.
That is also why vague environmental language deserves some skepticism. The Federal Trade Commission’s Green Guides caution against broad, unqualified environmental benefit claims like “green” or “eco-friendly” because they are difficult, and sometimes impossible, to substantiate. In home building, the same problem shows up when a builder uses feel-good efficiency language without naming the standard, the testing or the third-party verifier behind it.
So the real question is not whether a builder uses the phrase. The real question is how they prove it.
There Are Levels to Home Performance
This is where buyers deserve much more clarity.
A home described simply as energy efficient is not the same as a code-minimum home with a few upgraded features. It is also not the same as an ENERGY STAR certified home. And an ENERGY STAR-certified home is not the same thing as a DOE Zero Energy Ready Home.
ENERGY STAR is a meaningful benchmark. According to ENERGY STAR, certified homes are at least 10% more energy efficient than homes built to code and achieve about 20% improvement on average. That matters because it means the home has met a recognized standard and gone through third-party inspection and testing.
But Zero Energy Ready Homes (now DOE Efficient New Home) takes that concept further. These homes are built on ENERGY STAR-level performance and add more demanding requirements for efficiency, comfort, durability and health. DOE also describes these homes as so efficient that a renewable energy system could offset most or all of the home’s annual energy use.
That is a very different category from a builder simply saying a home is “efficient.”
The One Number Buyers Should Always Ask For
If there is one piece of information that helps cut through vague marketing, it is the HERS score.
The HERS Index is the industry-standard way to measure a home’s energy performance. RESNET explains that a score of 100 represents the reference home, and each 1-point drop generally corresponds to about 1% less energy use than the reference. Lower is better.
That matters because the phrase “energy efficient” can hide a wide range of outcomes. A builder may talk about better windows or upgraded equipment, but if they cannot show the HERS score, explain what it means and identify the independent rater, buyers are still being asked to trust the brochure more than the build.
Context matters here, too. RESNET reported that the average HERS Index in 2024 was 55. So when a builder publishes HERS scores as low as 5, it gives buyers real proof that the home is performing at a dramatically higher level than the average newly rated home, not just sounding efficient in the sales process.
What Builders Often Leave Out
This is where the conversation usually gets more revealing.
When builders talk about efficiency, they often highlight what is easiest to market. They mention HVAC equipment. They mention insulation. They mention appliances. Those things do matter, but they are only part of the story.
Air sealing is a big example. A home can have good insulation and still perform poorly if it leaks air in the wrong places. Drafts, uneven temperatures and extra HVAC runtime often come back to details buyers never notice during a quick walkthrough. That is why third-party inspections and testing matter so much.
Duct design matters too. A high-efficiency HVAC unit may look impressive on paper, but if conditioned air is lost through poor duct layout or leakage, the system may not deliver the comfort buyers expect. Equipment ratings alone do not guarantee low bills or even room-to-room comfort.
Ventilation is another issue that deserves more attention. A tighter home can absolutely be a better home, but only if it also has a deliberate fresh-air strategy. The EPA notes that Americans spend about 90% of their time indoors, where concentrations of some pollutants are often 2 to 5 times higher than typical outdoor concentrations. That is why indoor air quality should be part of the performance conversation, not an afterthought.
Solar language can also be misleading. “Comes with solar” does not always mean what buyers think it means. Sometimes the system is leased. Sometimes it is financed separately. Sometimes it is optional. In our case, 5,000 watts of solar panels are included on new to-be-built homes and are owned 100% outright by the homeowner, with no lease or rental.
What Greenwashing Looks Like in Home Building
In home building, greenwashing does not always look dramatic. Most of the time, it looks subtle.
It can look like a builder using sustainability language without naming any certification. It can look like a long list of features without an overall performance score. It can look like broad claims about comfort and savings without test results, third-party verification or real proof.
In other words, it often looks less like an outright false statement and more like a vague one.
That distinction matters. The issue is not that high-performance homes are a myth. They are not. The issue is that many buyers hear the same reassuring language used for homes built to very different standards.
That is why we encourage buyers to look for specifics. Ask what standard the home meets. Ask for the HERS score. Ask who verified it. Ask whether the home was tested. Ask how ventilation is handled. Ask whether solar is owned, leased or optional. Ask for concrete homeowner examples rather than polished feature lists.
A genuinely high-performance home should come with real answers.
What Real Proof Looks Like
Proof is not flashy, and that is exactly the point.
Real proof looks like a named certification. It looks like third-party verification. It looks like a published HERS score. It looks like clear answers about air sealing, ventilation and solar ownership. It looks like a builder who can explain how the house performs, not just how it photographs.
A better conversation starts with a few simple questions:
- What certification does the home actually carry?
- What is the HERS score? Who rated it? Is that the projected score or final?
- Is the solar system owned, leased or optional?
- How is ventilation and indoor air quality handled?
- Can the builder show examples of actual utility bills or modeled energy performance?
That is the shift buyers should make. Instead of asking whether a home sounds efficient, ask whether it has been measured.
Where We Draw the Line
This is where the difference becomes more concrete.
We believe buyers deserve more than broad efficiency language. They deserve proof. Our public track record reflects that commitment. DOE’s partner locator lists us with more than 1,107 certified homes, and RESNET has profiled us as a builder committed to certifying 100% of the homes we build under DOE Zero Energy Ready Home, Indoor airPLUS, WaterSense and NGBS Gold.
We also publish HERS scores on available homes and floor plans, with some homes showing scores as low as 5. That is far below the 2024 average HERS score of 55 reported by RESNET. And when it comes to solar, we believe clarity matters there too. We include 5,000 watts of solar panels on every new to-be-built home, and the system is owned by the homeowner with no lease or rental.
That is the kind of transparency we believe buyers deserve. It replaces guesswork with specifics and broad claims with measurable proof.
Proof Is the Real Selling Point
The myth is not that energy-efficient homes do not exist. They absolutely do. The myth is that the phrase alone tells you enough.
A genuinely better home should come with more than adjectives. It should come with a recognized standard, a measurable score and a clear explanation of why it will perform better day after day. That means steadier temperatures, healthier indoor air, lower operating costs and more confidence in what you are actually buying.
For us, that is what a better house is supposed to be. Not just beautiful on move-in day, but measurably better where it counts. For buyers in Delaware and nearby Maryland, that kind of clarity can make the difference between a home that sounds efficient and one that is actually built to prove it. When we talk about performance, we want to be able to show the certifications, the HERS scores, the solar ownership details and even the real power bill examples that support the claim.
Have questions about HERS scores, certifications or what real efficiency should look like? Contact our team or explore our available homes to learn more.
FAQ
What does “energy efficient home” really mean?
On its own, not much. The phrase becomes useful when it is backed by a named standard, testing and third-party verification.
Is ENERGY STAR the same as Zero Energy Ready Home?
No. ENERGY STAR is a meaningful verified standard, but DOE Zero Energy Ready Home, now under DOE Efficient New Homes, goes further with added requirements for performance, comfort, durability and health.
What is a good HERS score for a new home?
Lower is better. The HERS score gives buyers a clearer way to compare expected energy performance between homes, and the 2024 average HERS-rated home scored 55.
How can we tell if a builder is greenwashing energy claims?
Look for vague language without proof. If there is no named certification, no HERS score, no verifier and no testing information, that is a sign to ask more questions.
Why does third-party verification matter in home building?
Because it gives buyers an independent way to confirm that a home actually meets the standard being advertised rather than relying on marketing language alone.
Does solar automatically make a home high-performance?
No. Solar can be valuable, but it does not replace the need for a strong building envelope, quality HVAC design, air sealing and proper ventilation. A high-performance home works as a complete system.
What proof should a builder show before we trust energy-savings claims?
A builder should be able to show the certification, HERS score, third-party verification and clear information about how the home was designed and tested to perform.
What makes Insight Homes different from a typical “energy efficient” builder?
Insight publicly shows measurable proof, including certified homes through DOE’s partner locator, published HERS scores, homeowner-owned solar and company-wide commitments described by RESNET.
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