It's possible to grow them indoors, but you may want to wait until you get the hang of indoor cultivation as they aren't your typical houseplant. They'll probably do better outside until you've got some more experience under your belt. Heat can present a problem, but you can overcome that by shading the pot behind a reflective or heat-absorbent material. If you have any other outdoor plants, like a Sarracenia, put them into pots that are a little bigger than your Darlingtonia pot, and then surround the Darlingtonia with Sarracenia pots so that the plant gets sunlight but the sides of the pot don't. As long as you keep all the pots in question watered properly, evaporation and nighttime cooling should keep the roots cool enough. Large, deep pots with well-drained media also help in this respect.
~Joe