Well, I hope you're not going to base much of the energy design on EcoDesigner alone.
Ecodesigner is a nice toy to play around with, but I have yet to see any validation report about its maths.
Don't call your design zero-emission or passive or anything unless you do some accurate calculation on it.
If your project is to be built in the Alps and to be used in summer only, then you can probably achieve heating and hot water requirements with a combination of pvs and solar panels.
The state of the art calculation software for what you need is the PHPP by the Passivhaus institute. It's basically an excel spreadsheet, not that user friendly. But in my experience, if you're going for high energy efficiency, that's the professional way to go.