The energy evaluation tool - EcoDesigner - has not been validated according to any norm (ASHRAE or EN), so it can be used to have an idea of how the building is going to work, but that's it. This means that its results cannot be used in any official documentation/ calculation etc.
If I remember correctly, in a previous discussion on the topic (
http://archicad-talk.graphisoft.com/viewtopic.php?t=40154) EcoDesigner developer Miklos Sved stated that "EcoDesigner does the job". Whether it does or doesn't, it is not validated and you cannot use its result (at least, here in Italy).
In the same discussion I mentioned above, it was announced a new product called EcoDesigner Star, to be released before the end of 2012 and to be validated according to ASHRAE and to EN 15265. Unfortunately, I have not heard anything about it in the last two months.