I've never had fall chicks before. I got them about 2.5 weeks ago, all but penguin the cross-beaked are feathering out nicely. The smell in the kitchen became too incredible last weekend, and I finished predator-proofing their pen in the greenhouse. Not exactly a brooder, it's 2 ft wide, 2 ft high, and 7 ft long. Got a heat lamp above the pen, and below a wooden shelf in the greenhouse, so the heat will stay down where they are but the light being between in its big metal guard is less fire hazard. That's my theory. Question: temps will drop to 39 tonight. With a heat lamp, can they tolerate it, or will I need to bring them in? North and west wind are totally blocked. The green house has some venting but not a lot.