Chicks at one week don't need to be in a 90 degree brooder. Only one spot right beneath the lamp needs to be warm, and even 90 may be more than they need. You need to watch their behavior to determine how warm they really need it to be. Some chicks at one week don't like it any warmer than 80F under the lamp, and much cooler in the rest of the brooder. They do need cool space to shed excess heat.
Many of us brood out baby chicks in our covered runs. My chicks, at one day old, have a heating pad that is around 85 degrees under it. The rest of their brooding pen is no warmer than the warmest day in spring, around 50F. At night, it's in the 30s. Chicks don't need to be kept in a warm space as long as they have a warm spot to warm up under.
You may take your chicks outdoors anytime as long as you watch them carefully and bring them back indoors when they show signs of chilling. It's actually a very good way to encourage feather growth and to get them used to cooler temps. They will be ready to move outdoors into their coop at a much earlier age.
And no one here at BYC is going to get mad at you for asking questions!