So we officially moved our four chickens out to the coop today. They are about 5 weeks and the weather has been great. However our remote thermometer is saying it is 53 in there (although it should be above 60). Should we add a lamp? My concern is that if I do it will be too hot. They are not being loud or anything and are huddled a bit but not on top of each other. Any advice? Thank you!