I'm constantly using Ecodesigner and found that the air-to-air energyrecovery is not working properly. Whether you input 50 ot 90 for a recovery percentage, the outcome is still the same.
the other issue is when using floors on ground - no matter how thick is the insulation, the calculation result is still the same. Wierd, huh?
I'm using still Archicad 12. Could that be the trouble?