I'm just starting out this year and am trying to decide whether or not to put metal covers on my cypress telescoping top covers. Since heat rises wouldn't the metal be more of a negative than positive here in the South where humid summer nights range in the mid 70's, both in temps and humidity, and the winters are mild? I would think a metal top would increase the heat load in a hive in the summer rather than act as a neutral agent. I can see it in areas where it snows, but what are the advantages of using them in hot and humid climates? Any thoughts would be greatly appreciated .