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To help reduce the energy use of your existing system and anything you add, consider additional insulation, a strategically placed shade tree and/or exterior window valances. I've seen/like solar panels mounted over south side windows to shade the window from summer sun and let in winter sun. This can reduce the heat gain in the afternoons and consequently reduce or eliminate the amount of energy used to cool the house in the evening.
I like the idea of the filter screen replacement. If there is enough breeze in your area, this would be really energy efficient. The HEPA filter media is pretty restrictive.
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