I have this plant, as well as hybrids of it and A. odora. The sarawakensis is more cold sensitive than A. odora, in my experience.

LariAnn
Aroidia Research

Here is a link that might be useful: Alocasia sarawakensis

Can you give a temperature at which the effects of cold will show,as cold is really relative,say below 75 or 70 something like that.