additions administrative alterations ASHRAE building codes building envelope building envelopes building science certification code adoption Colorado amendments COMcheck commercial commissioning compliance pathway compliance pathways daylighting ductwork electric vehicle electric vehicles electrification energy code energy code compliance energy code training energy rating index energy software Energy Star existing buildings gray water heat pumps historical buildings HVAC HVAC sizing IECC implementation indoor air quality infiltration inspections insulation legislation lighting mandatory Manual D Manual J Manual S mechanical plan review refrigerants RESCheck residenital residential resources service water heating significant changes solar solar energy solar ready testing thermal envelope ventilation zero energy ready