I cover them all whenever it's going below 50deg. Mj. Can you cover them in place? If not, I'd sure bring them indoors.
Brassavolas aren't nearly as fussy about being moved as Phals are, in my experience. Just try your best to have the light hit them at a similar angle and keep the humidity up. Hanging wet towels around them helps a lot.
Boy, I sure hope that cold air stays to the north of us! So far the lowest forecast has been for 52 on the weekend.
