Excellent advice from OGM, especially doing it earlier in the day. Try it. I think you will find it is not an issue.
I also do not believe in the 90 to 95 and drop it 5 degrees a week thing. For those with no experience it’s a place to start so it has value but it’s extremely safe. The chicks are a lot tougher than that.
Part of getting experience is paying attention. It sounds like you are paying attention. It’s a good question.
For those that have to have numbers you might look at this. 70 degrees at 3 weeks isn’t very far out from the recommendations and I assure you, chicks are lousy at math.
0 – 7 = 90 to 95
8 – 14 = 85 to 90
15 to 21 = 80 to 85
22 to 28 = 75 to 80 ….. 3 weeks old