I don't think you have an irrigation system in your basement or a cool draft at night.
Actually, i do have a draft at night. We open a window in a nearby room & blow air toward the plant room with a fan. However, it does not lower the temperature very much. But from your description, a little more chilling might help. When I tried giving Brassavola a long cool rest in the guest room, it almost died.
Iris
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