We live in Northern MN and turn thermastat down to 58 @ night and sleep with the window open and heat off in our room and I have a comforter made from polyester batting from this company.
http://okleequilting.com/store
I use the 8 oz from here (Scroll down)
http://okleequilting.com/store/index...f1ad44d184da68 It is nice and warm!! I love to sleep in the fresh air even in the winter It it gets to 20 below we shut the window but have it open at least a crack above 20 below out side.
I don't think it can be quilted tho it has to be tied.
I threw a piece in washing machine with a load of jeans with no cover on it and it never lost a bit of shape. Have used it for 25 years with none of the quilt batting "bunching up"
They will send you a sample I believe.