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Most 90%+ furnaces have their own air intake. If that's not what you have you can bring in outside air via (ducted?) vent(s) to the outside, which is the prefered/cheaper/easier method. Or you can install a Fan in a Can combution air intake fan.
You follow the installation instructions for piping the air intake (to the outdoors) as well as the exhaust.
Do you have more questions?
In case my previous answers weren't clear if you don't want to take combution air from inside the house then piping the air intake to the outdoors is the only option.
Either I don't follow what you're trying to do or you have a misunderstanding about how these systems work. You seem to be talking about an air to air heat exchanger not a furnace. Your furnace (with the air intake piped to the outside) pulls in fresh air from out side and the exhaust vent piping dumps the exhaust, from burning the fuel the furnace uses, outdoors.
You can't use the furnace for heat and fesh air. The supply and return ductowrk is not designed and cannot be use for pulling in fresh air.
My name is Billy.
Please tell me the temperature and humidity range of the region you live in.
And also keep in mind by NOT recirculating air, the humidity cannot drop during ac. It is the constant recirculation that enables the ac to bring down humidity.
And on the Heat side the furnace is rated to only "raise temp" by a set amount. Say a furnace is rated for 40 degree temp rise......if the air temp outside is 10 degrees, the air coming out of furnace will be 50 degrees.
On ac the "delta T" or temp difference is usually around 15 degree. So if 90 degree outside the air blowing out of register would be 75.
Likewise the humidity removal as mentioned....the ac can only remove so much humidity so if you ran in 90 degree weather with 50% humidity you would still be supplying 75 degree 45% humidity.
With your region info of temp and humidity I can tell you what to expect....
Ok, I had just seen the question was still open.
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