heheh.. Yes I use mine year round. I flip them to shallow side (3/8) for summer, and the deep side (2") for winter. No scratching Jen!
This is what I have always understood;
In reading about hive temperatures I have found that the inside temps of the hive are the same as outside the hive. The bees DO NOT warm up the inside of the hive.
Temp readings indicated that there was less than a tenth of a degree difference between inside and outside hive temps on a cloudy day. On a sunny day, the wrapped hive was three to five degrees warmer inside than outside. When outside temps change, it took two to four hours for the temps inside the hive to reflect this change. As I understood it, the insulated hive took longer to change temperature. Up to 12 hours to reflect a 5 degree temperature change, which I think would be a good thing in the fall, but not such a good thing in the winter or summer. The insulation prevented solar gain. When it was -20 it took longer to GET that cold in the hive, but once it did it also took longer to warm back up..
So, in having that understanding I have never been concerned with heat loss, only with FOOD supply and keeping the bees DRY.. All of what I have just posted was read, or heard? some time ago, years.. so if something about that has changed I would like to hear it.
Maybe research that shows that bees can keep a hive insulated with XXX insulation at a constant temperature of 35 degrees, when it is -20 and the wind is blowing 50 mph for instance? I would really hate for them to have a 30 degree day and become active inside the hive because its a balmy 50 degrees in there..
What I do has worked well in my area since before I was born, but that does not mean I am unwilling to adopt a new method if proven better!!