First of all, look at how you can avoid adding heat to your house. Some ideas:
1) Hook up a gas grill to your natural gas supply and cook outside as much as possible.
2) Line dry clothing.
3) Shorten the long steamy showers and try to use cooler water.
4) Of course you don’t use incandescent/halogen bulbs for ANYTHING, right?
Second, if your attic is under-ventilated like most attics (very safe to assume it is), a quick weekend project to add a turbine and some soffit vents could drop it 10 degrees F in the summer, which will make a huge difference for less than $100 in materials. 140 degrees F in the attic on a 100 degree day is too hot. Aim for 120 F.
Third, there is no justification for wearing jeans, hats, leather shoes/boots, or long sleeves around the house and then turning on the AC because you’re hot. Hell, I usually skip the socks and just wear sandals June-July.
Fourth, if you have AC, at least maintain it. Change the filter regularly and clean the coils inside and out each summer. Also clean the coils on your fridge so it can get air flow and run efficiently.