I run all 8 frame mediums and am getting ready to build some nuc boxes for use this spring . If I use the 8 frame boxes for the bottom , I can build nuc boxes that will comfortably hold 4 frames . That will allow me to stack a nuc over a 1/2 8 frame box ( 2 nucs per 1 full box) . Does anyone see a problem with running 4 frames? I see that people really bounce all over the place as far as numbers of frames . If I do this as I am now thinking then I can keep all my equipment uniform which is a big plus to me . So anybody overwintering nucs in a zone 3 climate have luck with 4 over 4 nucs?