Leaves burn from direct sun exposure causing extreme overheating, not from being in a warm environment. That looks more like a bacterial or fungal infection.
I would start by removing any discolored parts of the leaves and dusting the wound (the cut edge) with cinnamon.
A copper-based bactericide/fungicide like Phyton should be avoided, as (if I recall correctly) coelogyne is one of the "no-no" genera for that.
I honestly hate sounding like a shill, but over the last few years that I have sold and used Inocucor Garden Solution on my own plants, I have found it to be very good at curing and preventing such maladies.
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