As the gas furnace and air conditioner are assumed to use the same blower, if air conditioner is not installed then when installing supply ductwork adequate space should be left for addition of a coil in the future.
A gas furnace keeps the indoors warm in winters by blowing hot air inside. An air conditioner cools the indoors in summers by the help of its condenser. But both may use the same duct for air flow. The both utilize the same blower and vents too. When furnace put warm air into home, air conditioner provide cool air, but both through same duct. So if air conditioner is not installed together with furnace, so adequate space should be left for air conditioning purposes when installing the ductwork for furnace.
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