Erratic temps and 4 week old chicks

[Atchurch]

I hatched chicks indoors on May 6th and they have most of their feathers, but not all of their head feathers just yet. I have a brooder plate that I can set up in their little coop, but kinda worried that even with all that, they may get too cold at night while it's still getting into the mid 60s at night. What do y'all think? I'll keep them cooped up for 3 days so they know that's "home". But it's in the upper 80s in the day. Think they'll be fine? There are 4 of them and they're outgrowing the brooder box.
Any help is appreciated and you'd think I'd know this by now but with the weather being all crazy right now, it's just different this time around.

 

[Ridgerunner]

4 week old chicks will be fine in 60 Fahrenheit as long as they are out of a cold wind and can get out of the rain. They won't need the heat plate. But if you can safely set up that plate it will not hurt anything and will make you feel better so do it. This is not just about the chicks, it is about us. We need to feel good and worry less.

 

[Atchurch]

Yeah. I put it out there just in case. Weather's been so weird!