Okay, I'm a new egg in the state of Massachusetts. I have 4 2 yr old hens. a RR, PLY Rock, SLW, and a black australope( spelling off) We have a 2ft x 4ft coop off the ground. No insulation. I'm getting conflicting info. coop is wired for heat lamp but is only 1 ft above roost bar. I have heated water bowl. So, do I use a heat lamp or not ?