How do I connect a thermostat with separate leads from the air and furnace?

I have two sets of wires 1 from the air and 1 from the heat (both contain 3 wires)going to 2 round thermostats. I replaced the one to the furnace with a multiple setting therostat. how do I wire the air to the same thermostat?How do I connect a thermostat with separate leads from the air and furnace?You must use a thermostat that has terminals for seperating the transformers from each unit.

It will have a RH (heating) and RC (cooling) terminal.How do I connect a thermostat with separate leads from the air and furnace?Way too little information here!

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