I live in SW Louisiana and its already reaching into the high 80s/low 90s during the day and around 65-70 at night so I have had them outside in the coop given the warm temps and they have done fine so far. Storm blew through last night so I brought my bittys inside because of the rain/wind/cold air. (just purchased within the last week and not sure of age and i'm new at all of this). Last night I had a fluorescent(i've read not good for them, but was all I had) for a little while but cut it off since they were chirping and walking around. Got up this morning to check on them and they were all cuddled together sleeping. I turned the lamp back one and they all woke up and went to walking around/eating/drinking/chirping again. Im going to keep them inside a few days until the weather warms back up, my question is what type of heat source should I use? I don't have a heat lamp yet since they are inside when its cold out and outside when its hot, but wanted to make sure they don't get cold inside as well. again, im a beginner at all of this and any advise/direction are welcome Thanks!