Duplex - double metered but one forced air furnace

[John Humphries]

This may be a dumb question, but it just occurred to me that a duplex that I am analyzing has separate meters, but only one forced air furnace. Currently utilities are included in the rent, but I'd like to have tenants paying for utilities.  How would this work with the one furnace? Can you have 2 separate thermostats?

My other properties have baseboard heat. Can't seem to wrap my head around this one. Can someone set me straight here?