They could be built so that they exhaust waste heat into the HVAC system in winter and then switch to an outside piped radiator in the summer or something similar.
End users wouldn’t buy it. They’d make some kind of deal where one is installed and they pay less for heat and the extra electricity is paid by the compute operator via a separate meter. So the DC operator gets cooling that is (averaged over the year) almost free since they are basically reselling the heat for half the year or more.
For individual homes it might be unwieldy to manage a bunch of small units, so apartment/condo blocks and businesses might make more sense for installation. They could be colocated with building HVAC.
I guess economics depends on what percentage of DC cost is power or water for cooling.