Storing chocolate at home in the summer In the summer while I'm at work I'd like to set the temperature of my small apartment higher--roughly 83 degrees as per US department of energy recommendations.  I'm planning on keeping it between 76-78 when I'm home.  However, I don't want my chocolate to to deteriorate.  Let's assume we're talking about a thin bar of Lindt milk chocolate.  It's been fine so far with the apartment set at 78*F and the chocolate in a dark cabinet.  I definitely don't want to put it in the refrigerator as this is too cold for it.

What is the maximum temperature I can leave my apartment at when I'm not around to keep the chocolate reasonably stable?  Should I use a cooler or box to keep the chocolate cooler than the rest of the house?    Is there a cheaper/better/easier option I haven't thought of?
There are three different crystal types in solidified chocolate with one of them being the prefered type.  This is why we temper chocolate, because it promotes crystallization of the prefered type. 

From what I recall, the ideal temperature for chocolate is 70&deg;F and the first type of crystal in chocolate starts melting at around 82&deg;F.  So while not ideal, you should be fine with the room at 78&deg;F.  Keep in mind Lindt chocolate with milk is a little softer than their darker chocolate line. 

You can simply place the chocolate in a cooler (like a coleman) along with a pop can that has been in the fridge. The cool can should prevent the chocolate from getting too hot. Switch the can with another cold one daily and that should keep the snap sound in the chocolate along with the taste.