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The Step Code uses new metrics to gauge energy efficiency performance: TEDI, MEUI, PTL...

• TEDI - THERMAL ENERGY DEMAND INTENSITY
  • The annual heat loss from a building's envelope and ventilation, after accounting for all passive heat gains and losses.
    
• MEUI - MECHANICAL ENERGY USE INTENSITY
  • The building's total modelled annual mechanical energy consumption including heating, cooling, ventilation.
    
• PTL - PEAK THERMAL LOAD
  • A measure of the maximum amount of energy needed to heat a building on the coldest day of the year.