Experiences with decentralized controlled residential ventilation?

I have been living in the new house with DZL since 09.2016. A switch can definitely be installed, most DZL systems have a control unit, I have a control with a "0" button, the fans turn off, the flap closes. I have to say that the flap is not very effective with DZL if there is very strong wind outside. In winter, I had to make simple flaps myself from styrofoam with foam on the edge and close the ventilation holes for a few windy days. In summer, the system runs continuously, except when it is hot outside.

Thank you for your reply.
Can you turn off your system via the control unit?
What kind of ventilation do you have? We are getting a Lunos.
Are you satisfied with the DZL so far?