Window Units Vs Central Air.

Probably not. Central air is more efficient in theory,(Slate) but central systems also frequently suffer duct leakage which window units don't, so from a practical perspective, they're probably about the same. In a test of 200 houses it found that leaky ducts waste 27% of air conditioning in an average home.

Window units also give you the ability to cool just part of your home. With a central unit you have to cool the whole house or nothing, and if you run your whole-house AC to cool just a couple of rooms then it's definitely costing you. And closing registers in a whole-house system isn't recommended because it promotes duct leakage which actually costs you more.

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

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