We live in NC. Our babies are a bit over 7 weeks old now. Last night we had our first frost. We have kept our chicks in an enclosed garage that has a heat lamp (not on them) only used at night now. Do I need to be concerned about the temps dipping into the low 40's and mid to upper 30's at night outside? We are planning to put them into the coop within the next week. Do I need a heating source in the outdoor coop? Should I completely stop use of the heat lamp in the garage before they transition to the coop? I can still see some fuzziness on the chicks in small areas. We often find one or two getting out of the enclosure. Suggestions?