I use a notched inner cover (notch down) as a top entrance year round (easily moves up/down with the expansion/contraction of the colony) with the smallest possible entrance (2 bee space max) on the bottom which is closed for winter upon wrap up (SBB are also closed).
I also use vent/feed boxes placed above the inner cover that are filled w/ dry sugar (for Spring feeding) and 2" insulation under homemade (deeper than standards) telescoping cover. This method (top entrances) has worked well for honeybees throughout northern US and Canada (and I suspect Ireland) for many years.
"All Beekeeping is Local."
I like top entrances, and so do my bees
After much research and contemplation, this year I experiment w/ insulating my hives all the way around.