I just ordered 15 chicks from Ideal that will be shipped next Wednesday. I have one heat lamp that has a 75w infrared light that I used last August to keep the chicks temps at 95F. But these are coming in February and we have nights in the 40s-50s. The chicks will be in a draft-free room...but it does get quite cold in there. What wattage would be best? I need my peeps toasty warm!