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Per RCW 19.27, permitted construction must achieve 70% reduction in annual net energy consumption by 2031 using 2006 Wa. State Energy Code as the base level. Continued incremental changes have been made this code cycle for fuel source selection, envelope air leakage control, ventilation system effectiveness, HVAC efficiencies, hot water generation equipment, renewable electric energy and lighting equipment.

Per RCW 19.27, permitted construction must achieve 70% reduction in annual net energy consumption by 2031 using 2006 Wa. State Energy Code as the base level. Continued incremental changes have been made this code cycle for fuel source selection, envelope air leakage control, ventilation system effectiveness, HVAC efficiencies, hot water generation equipment, renewable electric energy and lighting equipment.