Reducing primary energy demand through controlled residential ventilation

Hello,

is it possible to answer in general terms by how much the primary energy demand of a house is roughly reduced when a controlled residential ventilation system is installed? Or how is this calculated? Thank you

Go to U-value, log in, type it into the heating demand calculator and add a controlled residential ventilation - there you can play around with the air change rates and the heat recovery %.

How about the OP creates a thread with all his questions instead of asking a single, out-of-context question in at least three different places? That way, it would at least make sense overall.