During last year's Food and Wine Festival, I saw a chef from Bluezoo create an AMAZING sculpture out of "candy". Basically, it is a very pure sugar with maybe corn syrup in it. It is heated and worked into taffy-like ribbons, molded into what looks like glass, or even "blown" like real glass.
The chef said that heat is really not the issue in preserving it. It is humidity. He said he once had one of these sculptures in Las Vegas. It was really hot out, but since there was no humidity, the sculpture lasted a LONG time.
Keeping it at home would probably require the freezer. Unless you can put it in a display case with a strong dehumidifier in it. It is possible, I suppose.
Ted