It will be interesting to see if your Furan will survive such cold temperatures. You might want to consider two points:
1) cultivated Furan are not as hardy as those grown outside 24/7. Many Furan are hybrids, especially the red colored flowers. They are crossed with warmer tolerant Vanda. The genetic background might make those plants less tolerant to cold temperatures?
2) moving plants in and out of the cold might cause the plant stress? Unless the inside temperature matches the temperature their moving away from. Also, if you return them outside you have to match outside temperatures with inside. This might be okay if you are moving a small number of Furan? Jorch's idea of keeping them in a sheltered space can ultimately reduce stress for the plants.
If you pursue this growing culture, please let us know what you experience. A long time ago, I accidentally left outside a dozen Furan during the winter. When I discovered them at the end of March, I was shocked! These plants did not survive.
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