My 9 chicks are now 3 weeks old - they are doing great in the brooder which has a ceramic heat lamp - the brooder is on my enclosed patio - would it be ok to put them in my coop if I put the heater somewhere in the coop in case they need heat - right now it gets in the low 70s at night - the size of the brooder is 2’ x 5’ x 2’ - it seems big enough but the chicks look like they are ready for more room - what do you think - they are not feathered out yet but the heat lamp would be a source of warmth - thanks