built new home 3 years ago. Since then, when we open the windows on a hot day, there is a terrible odor in the house. It smells like cannibis/skunk/buring rubber. When the windows are closed and house is cool, there is no odor. Had the house tested for VOCs. A good reading for homes is 200-300 nanograms. My reading is 740ng. How can I find the source? I have investigated myself and narrowed it down but can't find the source.