I've been seeing so much about frostbite and am wondering if I should be concerned with my chickens getting frost bite if their water is freezing overnight? I am going to get a indoor thermometer today but even with that I don't know how cold it has to be in there for them to get frost bite. I have two 250 watt heat lamps in an 8x8 coop for them. I have been looking for some 500 watt bulbs but so far have not had any luck. I just want to make sure I have good preventive measures in place b/c I live in Georgia & it can get in the teen's here. Thankfully none of that yet though! Thanks in advance for the help!