(Separately, this is one of the great reasons to prefer multi-family constructions, and why US building trends have slowly realigned towards them: you only have to build one basement and electrical/HVAC system for 20 families.)
I’ve only rarely seen condo styles with shared systems and those typically come with unappealing expensive management fees, insurance, and shared expense to the tune 500+ per month on top of the price for the unit itself. My father used to mantain the infrastructure for such a development and those were prices circa 2000 or so.
(I don’t have a sense of expense for any of these things, but I assume they wouldn’t build them this way if there wasn’t some economic envelope that they fit into.)
The Midwest, Northeast, Mid-Atlantic, and most of the West have as cold or colder winters than Maryland. Indeed, it's largely only the Pacific coast and South/Southwest that don't have colder winters. Hard to call Maryland an outlier when like half the country lives in places that get that cold or colder!
So there’s not that much of the US that’s actually colder than MD.