Let the air cross in the house : Cross Ventilation :

Opening and closing the doors and windows at the right time when the air is pleasantly cool can replace the stagnant hot air with the cooler air. Keeping all the doors and windows at opposite ends open in the early mornings and at nights allows the fresh air to circulate throughout the home and helps in bringing down the temperature of your home. The key is to keep windows open when outside temperature is cooler than it is inside and keeping them closed when it's hotter outside. This way warm air trapped inside your home due to convection can be removed easily.