Use a Mini Split System.

Mini-split systems are neat. You have an outside condenser, like with a central system, and that runs directly to a cooling vent in each room without any ductwork.

Think of it as a window-unit AC that you mount on the wall instead of the window, and which is a lot smaller since the actual cooling apparatus is located outside. These save a lot of energy compared to central systems because you cool only the rooms you need to cool rather than the whole house, and because there are no energy losses through ductwork in a hot attic.

Read the full article at: http://michaelbluejay.com/electricity/cooling.html

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