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Much has been written over the years about sick houses and buildings. Buildings that don't breathe (enough) can develop very toxic air . This is especially true with new buildings, when all of the glues and paints 'gassing-off' (curing). A good air heat exchanger would be severely tasked. There are products that don't gas-off, or that supposedly are safe, but most of them are poor performers, or are expensive. It would be interesting and informative for someone to explore the actual costs to build one of these passive houses in Oregon in US Dollars.