So I have an open-air brooder, it's near a window. We keep the house low 60's. They have a heating pad below and a red light above. I test using my husband's infrared sensor. It's a cheap tool and it has a fairly cheap laser to point on what you want to know the heat of. The chickens seemed to like it and even chased it...but after the first couple of days I got the brooder I didn't need to test and see what temp it was. I've been able to lower the heat about a degree a day and they've managed well. Today they are about 17 days old (hatched Jan 18) so 95 to 90 minus 17= 78-75 in their warm spot. I have an idea of the heat level because I did this before, twice, with ducks. It is a bit cold in the house tonight so I got worried. They were puffed up and squished together under the most intense light so I was worried that I went to check in and they went spazzzztic, rageful angry peeping was shocking and they went nuts. Do I need to take them out of their cage to test if it's warm enough? It seems kind of counter productive. They have an 79 degree to 63 degree range in an 30x30 cage. They have enough room to sleep in the hottest area, a tissue box with dirt, water, food, sticks to play on. I'm not sure why the laser is the new enemy...just totally threw me off. After the initial chaos, (one was a runaway and the other was a screamer) they've been angels.