The Importance of Energy Rating
Energy ratings aren't just about checking a code box — they're about building better homes. Understanding IECC, HERS, and ENERGY STAR helps you deliver quality, efficiency, and value.
IECC Energy Code
International Energy Conservation Code
The IECC sets minimum energy efficiency requirements for new buildings. Most states and local jurisdictions adopt some version of the IECC. IECC 2015 is a Texas state wide minimum requirement.
- ✅ Establishes mandatory insulation R-values, window U-factors, and air leakage limits
- ✅ Requires blower door testing to verify ≤3-5 ACH50 (varies by edition & climate zone)
- ✅ Requires duct leakage testing to ≤4-8 CFM25 per 100 sq ft (varies by edition & climate zone)
- ✅ Multiple code paths to help ensure your compliance; Prescriptive, Performance, and U-Factor Alternative.
- ✅ Updated on a 3-year code cycle — 2024 IECC is the newest adopted edition
HERS Index Rating
Home Energy Rating System
The HERS Index is the industry-standard scoring system for measuring a home's energy performance. A HERS rating provides a score from 0-150+, where lower is better. A score of 100 represents a standard code-built home.
- ✅ HERS Index of 100 = standard new home; 0 = net-zero energy home
- ✅ Each 1-point reduction represents roughly 1% less energy use than a 2006 code home
- ✅ Administered by RESNET — only certified HERS raters can provide official ratings
- ✅ Includes on-site inspections and diagnostic testing (blower door & duct test)
- ✅ Provides homebuyers with an energy "MPG sticker" for their home
ENERGY STAR
DOE Certified Homes Program
ENERGY STAR Certified Homes are independently verified to be significantly more energy efficient than standard code-built homes. Achieving ENERGY STAR certification signals quality construction and superior performance to buyers.
- ✅ Homes must be 10-20% more efficient than code-built homes (HERS ≤ program threshold)
- ✅ Requires independent third-party verification by a certified Energy Star Partner
- ✅ Includes mandatory checklists: Thermal Enclosure, HVAC, and Water Management
- ✅ Requires ACCA Manual J, S, and D for HVAC design (no rule-of-thumb sizing)
- ✅ Eligibility for federal tax credits, utility rebates, and marketing advantages
- ✅ Recognized nationally — over 2.5 million ENERGY STAR homes certified to date
Why Builders & Homeowners Choose Energy Ratings
Lower Utility Bills
Rated homes use 20-50% less energy than a typical code-minimum home.
Better Comfort
Proper air sealing and insulation eliminate drafts and hot/cold spots.
Reduced Emissions
Less energy used means a smaller carbon footprint for every home.
Durability
Building science-based construction reduces moisture risk, builder callbacks, and improves longevity.
Higher Resale Value
Energy-rated homes consistently appraise and sell at a premium.
Market Differentiation
Certified homes stand out in competitive markets and attract informed buyers.
Understanding the HERS Index
Lower is better. Here's how the scale works.
HERS Index Score: The Lower the Score, the More Efficient and Better Quality the Home.
Build Better. Build Smarter.
Let us help you navigate energy codes and programs so you can focus on building great homes.
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