The first time we got bees it was 22 degrees during the overnights and struggling for 40 daytime. We fed syrup inside the hive and they built comb, released the queen and gathered pollen when the sun was out and wind was calm.
We put the package in one deep with foundation and set a quial feeder on the top of the frsmes in one of the corners. We surrounded that with a second deep box and crumpled up newspaper to fill the empty space. Over that we put the inner cover and outer cover.It worked just fine.
Heres the general idea: