I like Quilters Dream brand batting and would suggest their Request weight cotton batting. It is their lightest weight. I also have trouble with being too hot (medication side effects). I used their “Dream Orient” batting in it and have found it comfortable to sleep under even this summer. My daughter in San Jose, CA has been using a quilt I made with this batting for years. She says it’s cool in the summer and warm in the winter. It is a blend of silk, eucalyptus, bamboo and cotton. It is wonderful to work with, strong but very supple.