ENERGY STAR Certified Homes Version 3.2 requires a HERS index of 61 or below for Climate Zone 5 (vs. approximately 100 for the reference home) — about 40% better than code minimum. Certification requires a third-party RESNET-certified HERS rater to inspect during construction and at completion, duct leakage testing (≤ 4 CFM25 to outdoors per 100 sq ft), and ENERGY STAR equipment efficiency. For Utah homeowners, it is worth considering: the HERS certificate is quantifiable proof of performance (not just a specification list), it may qualify for Rocky Mountain Power rebates, and the performance improvement it requires meaningfully reduces utility bills over the building’s life. Incremental construction cost for ENERGY STAR performance above the IECC code: typically 2–5% of envelope and mechanical cost. HERS rater fees: $800–$1,500 for a standard project.