I prefer any of Quilter's Dream battings...hate Hobbs 80/20 (feel nasty, has inconsistent thickness and I don't like the "hand"). As to your LA quilter, how thick the batting her longarm can handle depends on the longarm. I recently quilted a wall hanging for a customer that used a high loft poly from Quilter's Dream and a wool batting - it was like quilting a feather bed but my Innova handled it just fine. However, I borrowed a friend's longarm (different make) when I was out of town and I could not use a double batting with it at all. Natural fibers breathe - cotton, wool, silk, bamboo - and man-made fibers - poly - don't. If you want a quilt that doesn't let the air from your fan to go through it, then try a poly batting if your quilter can't use a double batting.