Hi
We live in the northern area of the Michigan‘s lower peninsula aka 44th parallel. When do healthy chickens start to die due to cold air when dry and no wind? - 24 degrees. It’s not the often regurgitated (-19). I say -24 because -23 is the coldest it has been since I’ve lived here over the past 6 years and we’ve never lost a bird to cold air - ever.
Think about your question. It’s like asking, can a chicken get too much fresh air outside? No, you can’t have too much ventilation. It just needs to be provided in the correct manner. I believe you are wondering about your coops ventilation application. Please consider:
1. Prevent moisture / birds getting wet
2. Block all wind, especially in the winter
3. Ensure predators and rodents can’t enter your sources of ventilation
4. Ensure your chickens can’t escape either

5. Ideally you want to have a way for dust to escape or settle out of the coop too. Birds develop permanent respiratory health issues from poorly ventilated coops that they pass on to other birds.
so in summary, ventilation is great, never too much, just do it correctly, thus effectively. Good luck!