One system for each floor?

Your location?

Natural gas service will be available to home?

Post back.

IMO

Well, we weren't planning on a separate system for each floor. The home does have the ductwork, is plumbed for AC, and has a concrete pad for the unit outside the garage. We are outside of Portland OR (in Boring OR!). And yes, natural gas service is available to the home----we have a gas furnace, stove, and water heater as well...

If it is not too late I recommend separate systems for heating and cooling for each floor. It is difficult to maintain even temperatures thoughout a 3720 square foot house with one system.

Where will the furnace be located?