Hiving Bees in Cold Weather

I try to hive honeybees in temperatures 50* or warmer. If temperatures are below 50* I tend to wait, feeding the bees with 1:1 sugar water using a spray bottle. My equipment is warm because I bring it into my house the day or two before hiving. This is very important for giving the bees a better chance at survival. I have insulation on the outside and inside of my hives and an internal sugar feeder in each hive.