I was warned about the heat too. However, because I had bitched to a local garden centre so much that he never carried orchids, when he did, and they were Milts, I had to buy some.
A year on, and most of them are starting to flower, including one that has already flowered twice since I got it.
We go to 42C here at times, but we d have good air movement generally, and I think that helps.
I pot mine in fine bark, but I do put three small balls of sphag around the edge of the pot to just hold a little water, while the bark ensures that the roots can breathe.
Do you grow them outside? During those times when you hit 40-42C, what are night temperatures like?
__________________ May the bridges I've burned light my way.
It drops to about 15 in the hot weather, I think....
That's the difference. When we have 40-45C / 104-115 F by day nights are 32-35C / 90-96 F. Even a lot of succulents can't live with these night temperatures, such things as most Crassulaceae and Bromeliaceae.
__________________ May the bridges I've burned light my way.