Many times I've taken a struggling colony in a ten frame deep or two ten frame mediums and moved that little cluster of bees into a nuc the size of the cluster (2, 3, 4, or 5 frame nuc) and had them take off and thrive. Heat loss is a real problem when there are only a handful of bees. It's not a problem for a booming hive with two or more boxes of bees. I do live in a cold climate, but if it gets cold at all at night, I can't imagine that the results wouldn't be similar. ESPECIALLY in the spring.