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If you have central A/C you can install a programable thermostat (cheap and easy to install) and tell it to turn on the A/C about 30-60 minutes before you get home, depending on how fast it can cool your house. We use them to control the heat in the winter. While the house is empty during the day I let the temp get down to 60, then turn the system up to 68 about 30 minutes before my wife gets home.
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