If I am not mistaken, the scientific name of this plant is Euphorbia trigona 'Rubra'. Euphorbias are not cacti, but a separate genus of aprox. 2000 species, with abt. half of them being succulents. They exude white, milky sap if broken-injured, that some ppl are very allergic to. There are some that are hardy, but not yours. But from what I read, it should survive temps close to 30*F. They are beautiful landscape or houseplants, and yours looks extremely nice/mature. It would be sad for it not to survive. They take a while to establish, so hope that is the reason for it being 'sad'. I would have probably waited with repotting until it gets acclimated, unless there was a real problem. Was the existing pot really small? Or any other reason you repotted immediately? Best time to repot most plants is at the begining of the growing season. Typically, it is best to wait with watering for a while (5-10 days) after repotting. They need good drainage. What kind of sand did you use in the mix? Fine sand isn't probably very good to use, but sharp sand (grittier) would be ok. Often sold as horticultural sand. Or use builders sand which is also grittier. Many of us don't use any sand in a mix for succulents, but some do & it is often recomended on various sites...

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Is this chair designed by Arne Hovmand Olsen? What is the current value of the chair?

Unfortunately I didn't the option to add any photos to my original post. It (the option add photos) only showed up now in my reply.