Ah, the cobra cold roots myth! It amazes me that people mess about with ice cubes and water pumps.
My cobras live in full sun and are kept in conditions no different from sarracenia. They are in big black pots and some are in peat/perlite and some are in live sphagnum. They sit in about 5cm of water. Summer temperatures in the greenhouse reach 100F.
I've repotted them in the middle of summer before and the sphagnum has been so hot, steam was rising from it. They're as tough as old boots.
The only plant that gets too hot in my experience are cold-temperate butterworts. Even sarracenia purpurea ssp. purpurea can take it hot.
I think the more plants you have, the less you mollycoddle them as individuals and the happier they are when left to their own devices.