With my brooder,I have a thick layer of paper towel and then straw on top.
The top is a proper fly screen window, frame and all, with a 10kg box of seed to hold it down. Doesn't get humid at all.
It sits on patio, which is weather proof, but not heat proof.
It was 109f here today, so the light was off all day. Will turn it on later tonight when the heat easies.
The light is just a desk lamp with a 100 watt globe.
Heating at the moment isn't the problem. Keeping those little guys cool, but not cold. So I placed a fan facing above them to circulate the air.
I would love to swap some heat for some cold.
Well I don't like it too cold or too hot. Is there anywhere on the planet fitting this description?