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ASHRAE 90.1 — Energy Standard for Buildings

Updated Apr 3, 2026
Comprehensive energy efficiency standard for commercial and residential buildings.

ASHRAE 90.1 is adopted by the IBC and IECC as the baseline for energy efficiency. The standard addresses building envelope, HVAC systems, lighting, service water heating, and power generation. Envelope requirements include insulation R-values, window U-factors, and air leakage rates. HVAC system efficiencies include SEER for cooling and AFUE for heating. Lighting power density (watts per square foot) limits specify maximum lighting levels for different space types. Automatic controls including occupancy sensors, daylighting harvesting, and scheduling optimize energy use. Service water heaters must have insulation and efficient fuel use. Solar ready provisions prepare buildings for future solar panel installation.

TAGS
ashraeenergystandard
DETAILS
section
90.1
category
Energy Efficiency
code body
ASHRAE
code year
2019
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