KEEP THE HOUSE COOL THIS SUMMER Dear Heloise: Our neighbor gave us a great suggestion to lower our cooling bills this summer. He installed solar and sun screens on the windows that are on the sunny side of his house. These screens block the majority of the UV rays on the hot side of his home. So, we had a mobile screen company come to install them on ours. Oh, it’s so easy. And I’ll do anything to save money! I love your wonderful column. Keep it up! — Sara, Orange County, California A GROUP CHAT FOR WIDOWS Dear Heloise: Older women who are living alone can benefit from forming small group ch…