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Hard to say, probably not much. It would depend on whether it could actually enable your central unit to catch up and shut off. If the window unit were sufficient for the room you want to have cooler, so that you can close the door and the A/C register, and raise the setting on the thermostat for the rest of the house, that could help. If the reason the central unit is running so much is that it needs maintenance or replacement, spending the money on that rather than the window unit is what would give you the best payback on your power bill. If your A/C is 15 or 20 years old, it was inefficient to start with and has gotten worse. A new, properly sized, high efficiency unit can pay for itself surprisingly quickly.

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