title_body: Would a beer still be good after being cold then hot then cold again?
upvoted_answer: There should be no reason why beer would lose any quality from being left out at room temperature then being re-cooled.
  During the brewing and distribution process beer is exposed to a wide range of temperatures numerous times.
  Some specialist beers may include &quot;adjuncts&quot; or additional ingredients (fruit, honey etc...) that may be affect quality with a temperature range (none spring to mind).  However normal beer made with malt, hops &amp; water should be fine.
  Exposure to sunlight is more likely to affect beer than temperature.