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I am looking into a LEED Interiors project, at EAc1.3, the HVAC energy credit. I'm trying to understand whether the modelling for Option 2 of this credit is supposed to be done using the ECB method or Appendix G. In the initial option wording it says ECB, but under the paths it says 90.1 without specifying Section 11 or AppG. One project I am considering currently this would make a big difference to, since ECB would have my water source HP system in the baseline as well, where AppG would have a VAV system as the baseline. I have previously been told, though I can't now find the reference, that ECB isn't supposed to be used to show percent improvement, only for compliance purposes, so AppG was my instinct. Step 6 of the method talks about Section 11 or Appendix G, do I get to choose? If anyone has done this before I'd appreciate comments, in previous CI projects I have only seen Option 1 being used. Thanks