I have two Polish chicks in a large crate (sides buffered from possible drafts with heavy plastic and top covered over with double waterproof plastic backed picnic blanket, deep shavings on the floor) inside a 10x10x6 coop that has 15 other 5 month old to one year old chickens roosting. I do not know the exact age of the Polish (around 2.5 or 3 months?), but they look fully feathered and have a fairly full crown (have not had polish before so I don't know if the head feathers come late or not). They have been outside for a week (nights and days) but it has not gotten down this cold yet (30° tonight, coop usually is 5° higher). The polish had been sleeping in a bunch of 10 chicks until three days ago when we brought them home. My question is this: Should I run out there and have them spend the night inside the house tonight (where they would be way too warm)? Coop is insulated, has a deep layer of shavings, all those other birds and plastic over the windows/door gaps, etc. They should be ok, right??