Get a gas meter hung for each apartment, let them pay for the gas and rental of a heater. Have your local utility install a combo unit, that will heat domestic hot water as well feed into an airhandler. Each apartment would have it's own duct system, water heater and air handler. Each apartment could pay their own bill. Or if they are small bachelor style apartments, gas fireplaces might be all you need.
I like the first option, if it's an open concept style condo. Use round duct paint it, looks sharp. A cool industrial decor :)
-Canadian Heat
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