Pattee, I'm here in Olympia, which is similar to you. but runs about 3-5 degrees colder. I have not put any heat in my coop and the girls are doing just fine. They have been coming out every day and trying to scratch frozen ground, and roosting outside. I give them lots of treats outside right now. I wouldn't suddenly turn off the heat if I was you because we are having some pretty cold nights and they need some time to adjust, perhaps turn it down 5 degrees every other night until they are at 30 F? They need to build up their downy feathers.