my father is handicapped and sleeps in a recliner at night, he usually sleeps with a pillow behind his back bu?
but because of the summer heat he sweats.. know of a back support pillow (memory foam?) that would be cooler than a regular pillow, yet still provide support?

memory foam pillows tend to retain heat. perhaps you could find a cooling blanket of some sort. tempurpedic beds retain heat. I know, I hae one and they were partly developed for that.