ASHRAE 90.1 is a benchmark American National Standard that provides minimum requirements for the energy-efficient design of most buildings, except low-rise residential buildings. It has been a cornerstone of building energy codes in the United States and worldwide for decades.
| Category | Focus Areas |
|---|---|
| Building Envelope | Insulation (R-values), Fenestration (U-factors), and air leakage control. |
| HVAC Systems | Equipment efficiency, fan power limitations, and mandatory controls. |
| Lighting | Lighting Power Density (LPD) and automated occupancy/daylight sensors. |
| Power | Voltage drop limits and automatic receptacle control. |
Users generally follow one of two paths to prove a building meets the standard:
Note: Because technology and construction methods evolve, ASHRAE updates the 90.1 standard every three years to push for higher efficiency.
| SDO | ASHRAE: American Society of Heating, Refrigerating, and Air Conditioning Engineers |
| Document Number | Standard 90 |
| Publication Date | March 30, 2026 |
| Language | en - English |
| Page Count | 484 |
| Revision Level | |
| Supercedes | |
| Committee |
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