Yeah, run down to wal-mart and pick up a timer. . .they're like $5. (I got mine on sale for $1.25 so i picked up like 10 of em, lol)

Also, you might ask a friend who lives in town or near by if they could stop in and check the temps just to make sure all is OK! Also make sure you have the cage locked up or something heavy on top or something! Wouldnt want a loose snake around the house while ur gone. . .cat might go missing! (YIKES!)