I have five ISA brown hens that should be laying. I got them in late June and was expecting eggs by now but havn't got any. I'm worried it's because of the cold but it hasn't gotten too cold in VA, but I have no way to warm it electrically or with a heat lamp because my coop is nowhere near an outlet and my husband doesn't want to run a huge cord across the front yard. Any idea why my girls arn't laying and what I can do about it? They look pretty healthy and act normally.