I personally would not buy a place without a/c and I wouldn't buy one here unless it could be added. The ERV may work for most people, but I need my place to be 19°C basically 24/7 in order to be comfy. That's not gonna happen at a unit in this place. I wouldn't be paying $900K on a place that I know I'm not gonna be comfortable in.
I agree with Mike K. - having also lived in essentially greenhouses in the sky the difference AC makes can't be overstated.