As many of you know, we are building a house, and I am a wool lover. We have spent the last week insulating with a wool insulation product that we bought. It is by far the best insulating experience I've had. We have done fiberglass (ouch!), cellulose, foam (fumes). Aside from all the overhead work, there are no side effects to insulating with wool. It's easy to pick the itchy fibers out of your clothes.
Notice Andy's felted wool hat. We call that one Fried Eggs.