We have an average annual high of 71, average annual low of 47, and average annual precipitation of 54 inches of rain. It does hang out at nearly 90 for around three months straight and sits around freezing for two months. I am leaning towards an even mix of Rhode Island Reds, Easter Eggers, and White Leghorns. What good layers would do well in this type of climate without much if any added heat/cooling devices? Thank you.