I do agree that S psittacina is a heat torelant plant, S. purpurea venosa too. But once in a while still they need a rest. I treat my Sarra like I do with my VFT during dormancy. They do well so far. (Fingers crossed)
I have a Judith Hindle before which it died just before I do anything to it during it's dormancy, in fact it just entered the dormancy. I think this is a not too heat ressistant type.