I have only turned one on once this Michigan winter so far (it was down in the single digits one night). We have a few days worth of single digit night time temps coming up starting tomorrow. My coop is 8X6. I don't know if the one bulb I hung probably 4.5 to 5 feet from the floor, in the middle of the coop, did much to warm up the room last time. I lowered it a bit yesterday. The fixture it self has room for 4 bulbs to be placed in it. I only had the one red one on though. Should I lower it more? Should I put more red bulbs in the fixture? I have not done much heating at all after reading on this sight that it can lead to sickness. So any advice would be appreciated. Thanks