Texas energy code & climate-load drivers
- IECC climate zone: 1A-2A-2B-3A-3B-4B
- Required attic R-value: R-38 (IECC 2021 prescriptive minimum)
- Required wall R-value: R-13 (above-grade wood-frame)
- Adopted energy code basis: IECC 2015 — older cycle, R-49 attic + R-20 wall (cold) or R-38 (warm)
- Stretch code available: No — IECC base code only
- Annual heating + cooling load: 1,900 HDD / 3,000 CDD
- Vapor barrier requirement: No statewide vapor retarder rule — climate zone determines
- Dominant attic insulation material: Blown fiberglass loose-fill — dominant in cooling-dominant Sun Belt
- IRA HOMES + HEER rebate status: Planning — IRA implementation plan filed with DOE, rebates pending state legislature
Texas licensing, rebates & permits
- License status: No statewide trade license
- License board: No statewide insulation license; State Energy Conservation Office (SECO) administers IRA HOMES + HEER (official site)
- Permit: permit required for attic insulation retrofit per Texas Energy Conservation Code; municipal contractor registration required in Houston, Dallas, San Antonio, Austin, Fort Worth on residential exterior contracting
How attic insulation upgrade costs vary in Texas
State-specific code or insurance rule: Texas Government Code §447.004 imposes the Texas Energy Conservation Code (IECC 2015 base with state amendments) statewide — Texas was the last major state to adopt residential energy code statewide, and the Texas State Energy Conservation Office (SECO) under the Comptroller is the IRA HOMES + HEER administrator with one of the largest IRA rebate allocations in the country at $689 million combined HOMES + HEER, providing residential insulation rebates layered with utility-funded Oncor, CenterPoint Energy, and CPS Energy weatherization programs.
Cities in Texas
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