Installing A Central Air Conditioning Unit

As the man was installing the furnace he mentioned that he would include vents in the duct work that would accommodate central air conditioning if we would decide to install this at a later date. He went on to tell us that we would save money having them both installed at the same time because we would not have to have them come back out and pay the labor cost. We had talked about having central air conditioning. We live in Minnesota, so we do not have that many days when we need the central air conditioning, but it is helpful to have it going to help remove the moisture from the air. We do get quite humid weather in the summer months.