> They are that airtight. That is why they put in mechanical ventilation such as HRV and ERV. The houses are that air tight that off-gassing is a problem once t

> They are that airtight. That is why they put in mechanical ventilation such as HRV and ERV. The houses are that air tight that off-gassing is a problem once they get down below 0.6 ACH @ 50 pascals as they do in passive house builds. Yes, off-gassing is a problem. Off-gassing is a problem long before a house is really airtight enough to efficiently maintain a pressure differential, though. 0.6ACH@50Pa means that your house is extremely airtight by even modern standards. It also means that a very light pressure is sufficient to cause your house to completely exchange it's interior air in less than two hours. If you want to depressurize a house enough to offset a high pressure weather system, you're going to be moving a lot of air. > It happens, I read this the other week. Yes, I know it happens. That's why I said it. This is another reason that you cannot significantly depressurize a house. Plus your door would fly open and break your face when you turned the knob. > What I don't understand is what point you're trying to make. > If it is that the air tightness of a house coupled with a HRV is not sufficient to effect barometric pressure on a human body, then I already acknowledged that might be so. It also might be sufficient, which is why suggested getting an expert's opinion. Yes, I'm saying it won't work. For many reasons. You don't need an expert. It doesn't even pass the sniff test.