According to this article, they can be frozen to death...But yes, heat is the preferred treatment, just not with electronics.
"If the bugs have gotten into the electronic, things get more complicated. The item needs to be fumigated by deep-freezing. The only safe method so far is pressurized carbon dioxide snow, best known under the brand name Cryonite. Not all exterminators will be able to use pressurized carbon snow, so ask beforehand."-
Killing Bed Bugs in Electronics - Yahoo Voices - voices.yahoo.com
Visit the article, the sources for the article are pulled from several places.
Spot freezing will kill the bugs an their eggs, but offer not lasting protection. Read more here -
Bed Bugs | University of Kentucky Entomology
Edit to add : No dropping your ac to 32 or below isn't going to do it, you need extreme cold, aka Spot Freezing or the stuff the bug companies use. Yet another link from the University of Minnesota..
Using Freezing Conditions to Kill Bed Bugs - Let's Beat the Bed Bug! The US Military also agree's with the temps stated int he U of M article.
An yes heat is preferred if trying to kill them in normal places aka not electronics. My wife is a AGM of a hotel down here on my sandbar an deals with it often enough.
Come visit but leave your bugs at home people!
The second link from the University of Kentucky, will give you more info then you ever wanted about bed bugs.
Enjoy!
Sirscrapalot - Bugging out
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