Lots of great suggestions here for keeping it cool in your house this summer. Which ones also get you a better Home Energy Score? Air sealing and insulation! These are not just for keeping the heat in during the winter but they do double duty to keep the heat out and the cool air in during the summer. You can buy a top-of-the-line heating, ventilation and air conditioning system but without proper insulation throughout your house, you are paying to pump conditioned air into the great outdoors.