The Better Bee catalog has a wonderful cover showing a European bee yard full of hives with peaked roofs rather than our American flat "telescoping" covers. Are these covers in wide use in Europe? Are they used to increase ventilation in moderate to warm climates? Are vents of some kind incorporated? Would this design make sense in warm climates here in the US. How about our northern climes - warm summer;cold winter? Jeff Hills Dorset, VT