Dear Heloise: I often have friends come to visit because I live close to a beach. Someone always forgets something: a toothbrush, shampoo, toothpaste, lotion, sunscreen, etc. Trying to be a good hostess, I stocked up on a whole bunch of travelsize items and saved the ones from hotels.Of A., they have already arrived. If you had tons of money, you could, like, build a new house that is oriented toward the sun in the coolest way possible, and has a reflective metal roof, and is landscaped so that the house is optimally shaded, and has high ceilings, and stateoftheart ceiling fans, and perfect insulation, and cool tile floors, and a topoftheline central air system installed by an avuncular, caring HVAC contractor who would become like a part of your family. But since that scenario is not applicable to most of us (point of reference: I personally live in a rented apartment in Brooklyn, where a Brooklyn plumber has to come once a month to clear the extremely elderly shower drain) don't