Scott

They may look fine, but truth is Thailand (SR origin) is 80s and higher at all times. I checked some of my plant books and did find a red leaf ornamental and it says not under 66 degrees. So considering it's origin I wouldn't chance expect it to do well with cold snaps.
When plants shut down from cold, the water sits around the plant and rots roots and finally corm. You may even see the plant fall over from rot. The corm will be the last to go.
My neighbor has an SR that's coloring up great. But it needs this Zone 10 for results. It's potted up and only watered every 3 days. Plant won't grow if roots are rotting.

__________________