Climate & Energy Design Data

Climate inputs architects need for envelope and HVAC design — ASHRAE/IECC climate zones, heating and cooling design temperatures, degree-days, and energy-code envelope requirements.

Climate & Energy Design Data

Every envelope and HVAC decision starts with the climate. Before an architect sets insulation levels, glazing performance, or equipment sizing, they need the climate zone the jurisdiction adopts, the outdoor design temperatures the mechanical engineer sizes to, and the prescriptive envelope targets the energy code enforces.

The pages below explain the ASHRAE 169 / IECC climate zone system, what heating and cooling design temperatures mean, and how prescriptive R-values, U-factors, and SHGC limits tighten as zones get colder. Specific values here are typical and illustrative for orientation only — the energy code edition adopted by the authority having jurisdiction (AHJ) and the official ASHRAE design-condition tables are always authoritative for a real project.

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