People do not want to eat when it is too hot. Restaurants generally know that and make sure that the restaurant is cool.
If you want the quality without the issues, try Canoe. It is commonly owned with Os, but I have found that the food quality is actually better, the prices are lower and the environment is not pretentious. I believe that their air conditioning works too.
We go to Canoe frequently and do not go to Os anymore even though they are right around the corner.
Jetskier