Each furnace should be on its own circuit breaker. The furnace nameplate will tell you what size breaker the unit requires.
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In most cases a dedicated 15A circuit will do it. I usually put it in #12. For pennies a foot more than #14 your covered and may save a bit on the power bill. If the unit is not within sight and 50' of the panel I would install a pull-out disconnect and use armored flex to sleeve any exposed cables. Like from the disconnect to the unit.
Don't forget the thermostat wire if it is in the same wall. A phone call to your heating guy should confirm the circuit size needed and the thermostat wire preferred.
Looks like it has potential. Let us know how everything goes. Post more pictures when you get a chance.