My parents house is from the 1950's or so I think. It has radiator heat which works by having a furnace heat up water, which is then pumped through pipes around the houes to get it warm. They live in Chicago, and in the summer it gets pretty hot, and they have no air conditioners except for the window-units. The house is a 2 story with a full basement. Can you get central air installed in a house like this? If so, how much are they looking at?