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There are three reasons why whole house fans generally vent into attics. First, whole house fans are designed to pull air from the highest point in the living space of a house, which is generally where the warmest air collects. This removed air is replaced by cool air entering windows in the first floor, flushing the warm air out of the house. The highest ...


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As was said in the comments on your question, you get additional efficiency by clearing hot air in the attic in the process. Your house air is maybe 75-80* F, while your attic can be 100* or more. Ventilating the home and the attic results in greater overall cooling by reducing heat that would conduct back through any attic insulation. I assume here that ...



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