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The four-room flat in which we grew up had heat registers in the floor — square grates about the size of today’s laptop computers. Huge ducts snaked through the cellar from the furnace to the grates carrying hot air to the registers and providing a warm spot in each room.
In the boom years, we as a family ascribed to modern times. The old coal-fired furnace had been converted to oil, and the air ducts were replaced with hot water radiators along the baseboards surrounding each room.