I made my mom a quilt for her twin size bed for spring/summer, put flannel instead of batting, cotton backing, and weight-wise it is heavy. In fact, it's the quilt in my avatar. She wanted it large enough to be like a bedspread and go all the way to the floor on both sides. I've never slept under it, so don't know about the heat-wise part of it, she is 85 and very thin, so she is cold natured, she loves it. Anyway, judging by other quilts that size that I've made with 80/20 batting are much lighter weight-wise, and I would think heat-wise too.