I'm not sure. I'm on a coastal climate where there's nighttime cooling pretty much year-round. How long is your hot season? I think it will work, but you may want to consider something like circulating water. Build a little water feature that flows over the pot. Plant it using a porous mix with something like lava rock, and add live Sphagnum moss on top. The Sphagnum helps keep the sunlight from heating the soil surface and I think it may also provide some evaporative cooling as it wicks up water and photosynthesizes. Darlingtonia grow in the wild on seeps and stuff and can take conditions that are pretty harsh. Oregon isn't known for heat, especially the valley and coastal regions where Darlingtonia is native, but it can easily get into the 100's for several weeks at a time at the height of the Summer. The key is making sure the roots are happy.