I'm in Québec in the Ottawa region. My electrician installated a 40A circuit for $450, including labor and parts. I'm using a non Audi charging station since the Québec government is subsidizing the purchase and installation. As for the ventilation system, my charging station installation instructions did mention that certain cars requires it. I've ask my dealer and they said that they were not told by Audi that one was required, in fact their delivery bay did not have one and my car was charging when I took delivery. I have also checked the owner manual warning sections and did not see any thing about this, I've being charging my etron in my garage since November without any issues.