Achieving good indoor climate values

@patbone Thank you for your quick response. The Minergie requirement does not come from me, but from Ulrich Nyffenegger, Office for Environmental Coordination of the Canton Bern, on the occasion of this Minergie conference. Your statement that such a Minergie house can be built with an oil heating system is true, but this must also be put into the correct context. For a Minergie single-family house with oil heating, the percentage is below 2.5%. Regarding "mandatory ventilation" or comfort ventilation, there are many prejudices. In summer, our windows are always open, so the ventilation is turned off. Also, during transitional periods and in nice weather, the patio door is always wide open... What matters most to us is the ventilation losses – that is, the lost energy that must be brought back into the house. A comfort ventilation system with 85% heat recovery reduces these losses multiple times! Controlled ventilation does not require an air conditioning system and there are no drafts. I find planning ventilation ducts also in a concrete ceiling no problem. This is often done as well. Otherwise, there are other ventilation systems – namely decentralized ones. We have such a system at our place. Decentralized ventilation units with heat recovery can also be retrofitted. There are various providers on the market. Here, for example, is a link to a very interesting homepage of a German passive house owner. Thank you for the exciting discussion

We will have a comfort ventilation system installed and have our wooden house Minergie certified.

However, a comfort ventilation system has nothing to do with air conditioning! You also don’t feel any drafts (unless you really turn it up!).

As already mentioned, it only serves the purpose of air circulation and counteracts energy losses such as those from window ventilation.

Today’s airtight building envelopes require, as has already been written here, a constant exchange of air to prevent moisture damage (also in wooden houses). Just recently, an architect (not ours) told us about his own house, which is supposedly ten years old, very tightly built, and has no ventilation: mold growth and unhealthy indoor climate.

In any case, we are convinced that we definitely want to bear the additional costs and that today a comfort ventilation system belongs to the current (and especially future) living standards.

What convinced us in theory above all is the HOVAL-Homevent. Is there anyone here in the forum with experience with this device?