I have a gas furnace one one thermostat and a ac unit on another thermostat can I combine them in to one digital thermostat?

1st you need a heat cool thermostat
2nd you need a thermostat wire running from the furnace ( with 4 wires in it)to the spot where you want to mount the heat/cool thermostat
3rd when you get this much done ,let us know and we will continue with instructions