I don't have a attic either, two story house but just a crawl space, 100+yr old house. It stays pretty comfortable because we have big shade trees, eleven foot ceilings and the hot air naturally rises and pulls the cooler air from the cellar. We do use airconditioning when it gets over 90. One medium one in the living room and a small one in our bedroom, just enough to make it comfortable. I don't care what it costs, it's worth it.
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