32 deg F for a few hours won't bother a dry, acclimated Den. kingianum. A dry orchid can tolerate more cold that a wet one. And the "acclimation" part is critical. There are actually many orchids that can tolerate low night temperatures for a few hours in winter. My yard (not even a GH) does not get quite that cold, but it can occasionally get close. And the plants aren't even that dry... I do water only in the morning in winter so plants have a chance to dry somewhat. If I acquire a new plant in late fall through winter, that might be marginal for cold tolerance, I'll protect it throght the first winter, then put it outside in spring, where it can acclimate through the full range of seasons. By the folloing fall, it's tough enough.
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