Just a question, even though I don’t have one: would the controlled residential ventilation possibly also dehumidify the air? In summer there are always days when the humidity outside is very high, and inside accordingly as well, so I would have long-term concerns about the moisture. But you can’t really solve that by ventilating either.
As long as the temperatures outside are lower than inside (e.g. at night), the controlled residential ventilation dehumidifies the air coming into the house. That is the normal function of the system.
So that ventilating for a duration of 5-10 minutes cools the house massively is nonsense. The air is exchanged, and it has a very low heat capacity. After all, it is a gas and the total mass is therefore low, ergo only a little heat is transported outside.
Most of the heat is stored inside the house itself, in the walls, in the floor. That is why it is as warm again shortly after ventilating as it was before.
No, that is not nonsense. Since houses nowadays generally consume little energy, the heat loss due to ventilation has a massive impact on the energy balance. It used to be different in old buildings/existing stock (pre Energy Saving Ordinance times). There are plenty of studies and example calculations on this. Ventilation heat losses in an Energy Saving Ordinance house amount to up to 30–40% of the heating energy used. The heat you are referring to in the walls, floors, etc. is released again directly into the room air while your windows are open and partially directly ventilated outside. Furthermore, the fresh air you bring into the house each time extracts energy from those sources (walls, furniture, etc.), which is then directly and indirectly compensated again by your heating system.