There is no a/c, our elevation is high enough not to require it because of the temperature difference from lower and the difference in humidity as well.
The house is well designed with lots of windows for cross ventilation.
Few homes in our area would install air conditioning because it is considered unnecessary.
Another consideration is that you come to Hawaii to experience the whole Hawaii.
Being closed in a room with air vents is not the same as having your windows open, getting fresh air and being able to listen to the birds and crickets outside.
To each their own, but for a home that would be lived in like a local would live in it, this is authentic.