Wow! 76 degrees is COLD! I have mine set at 80 during the day when I am home and 82 when I go to bed.
You do not mention it so I will assume you do not have a programmable thermostat.
Go to Walmart, Lowes or wherever and get one.
If you usually get home at the same time everyday just set it to come on an hour or two before to start cooling the house.
I would set it to about 90 when you are not at home. No need to cool the house when no one is home.
Another thing to focus on is the attic. How much/what kind of insulation do you have?
Might be time to replace or put more insulation.
You need to put a radiant barrier in the attic.
Xringer's suggestion is a good one. You can also buy a radiant barrier paint and paint it on yourself or hire someone to do it.
Paint is your best bet.
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