Vent a Lot
Run a fan and an air conditioner simultaneously. You can use the air conditioner at lower power and still feel cool if the fan is blowing over you. That's because the air conditioner removes humidity from the air while the fan helps evaporate sweat and moves heat away from your body. (Note: Fans don't cool a room; they just make people feel cooler, so shut them off before you leave.)
Turn on the vent in the bathroom. When taking a shower, be sure to use the vent fan: It helps sticky moisture escape.