Mvhr does however have a down side.
They only lower the temp by 5 or 6 degree from the outside temp. So if it's 30deg outside the room will only be 24-25 Deg. On a plus note they are way more efficient and the noise levels are about 25-35 decibels.
Airco get a lot lower temps but on a down side run at 45-50 decibels and you get blasts of cold air not a constant room temp.

It's all about air movement.
Mvhr are 0.8 -1.5 per hour.
Aircons 2-4 per hour