Another suggestion from your 3 - use an exhaust fan on one end of your home, blowing air from your ceiling out a window(you want to blow the air near the ceilin

Another suggestion from your 3 - use an exhaust fan on one end of your home, blowing air from your ceiling out a window(you want to blow the air near the ceiling, it is warmest). Use an intake fan at the lowest elevation possible. The premise is...cooler air falls, warmer air rises. You want to blow in the low(cool) elevation air, and exhaust the high(warm) air.