We have 7 chicks, they turned 4 weeks old today. They have lived in an inside brooder box since 3 days and have been happy, but are now outgrowing their box. I would love to get them outside ASAP but we just started a cold snap (northern FL). Currently the temps are high of 65, low of 30 and will be that way all week, though should be mostly dry. They have been without a heat lamp the last few days and been fine (inside is about 65 degrees). I assume the birds will be fine during the day outside but not sure how'd they do at night. I'm hoping I can just close them up in the small coop I have and they will stay warm?? There will be plenty of pine shaving/wood chips, food and water. Thoughts/guidance, please? I just want to ensure they will stay warm! side note, they appear fully feathered.