the warmth factor i think is based more on the batting/fabrics used-
some batts are much warmer than others- loft and fiber content would dictate whether or not the quilt will be warm- or more (a lightweight-warm weather) quilt. very thin cotton batts offer the least amount of warmth...lofty wool batts the most- regardless of the amount of quilting also, heavy cottons, flannels, homespuns, wools are warmer than thin cotton calico's. it is all dependant on the (whole package)