Hi everyone...I have 4 one-week old Golden Comets residing in a spare bedroom that's about 70° right now and they're quiet and looking comfy snuggled next to each other and they are not shivering...been using a heat lamp 24/7 until today as it got quite warm in there...wondering if I need to plug in the lamp or leave it dark? our thermostat is set to 68°… thank you.