Is Tempur heat generating

The Tempur cloud sounds perfect for me but I have heard that memory foam is hot. I get too hot at night very easily, is it likely to make me too hot?
I am interested in Tempur as I have hip and shoulder pain, am 8 stone so need something that gently supports. My current mattress does not support my waist when lying on my side. Any advice you can give would be greatly appreciated please.