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Most homes in the Chicago area that last had their entire heating system replaced prior to ~1930 were hot water radiator heated (most of those buildings later got window AC units when they became affordable). Most I've seen mid 1940's or later were forced air.....Heck the house I grew up in until the mid-90's had it's original force air heater with 60's-80's AC system add on....The replacement for just the heater was 1/3 the size.
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