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Older homes carry stories in their walls, but those walls were rarely designed with modern air conditioning in mind. Plaster over lath, shallow floor cavities, balloon framing, knob and tube wiring, sometimes asbestos in duct wrap or floor tiles, and no return chases. Each quirk matters when you try to move air, refrigerant, and condensate quietly and efficiently through the structure. What follows is a field-level look at what works, what heating replacement fails, and w