Interior air pressure, oxygen, airflow

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If my home’s windows are closed and I exit a room, my pushing the door closed and letting it go prior to close won’t allow it to close from the air pressure. Yet with the window open and use of same force it slams. So clearly there’s a decent seal within my house.

That means the air conditioner would struggle without the intake where I’m changing that pesky filter every month or two always hoping it helps allergies.

So that brings me to my question. It doesn’t seem as if that intake or the vents when the HVAC is off allow for much airflow. If one was to stay in a house for too long without using the HVAC (perfect temp but maybe smoky outside so keep windows closed), would the seals that are there for insulation cause the air to get saturated with co2 from ones breathing and ultimately deplete the oxygen to a level too low to breath properly? Does enough oxygen leak inn just from the variant temp of outside and inside?

In: Physics

Yes, it’s possible to lower / deplete the levels of oxygen in a sealed room or house by just breathing, or increase the level of carbon dioxide to critical / dangerous.

People like to open windows to “bring in fresh air” for this reason.

Not an engineer, but I live in a decently sealed house and am fairly well versed in various sciences. I am thinking that no, it will not be an issue. No house is completely sealed. There are several factors here; there are tiny leaks throughout the house; these may be too small for air pressure to balance the inside with outside pressure when closing the door, but they’re there. Drywall is permeable. CO2 is heavy, so will fall to the floor, and will find leaks along bottom of doors, electrical outlets, under baseboards that never form a seal to the floor and which hide imperfections such as the drywall not fitting right along the floor either, etc. The volume of the house matters, as well. If you have a well sealed, but tiny house, with quite a few people, you might have an issue. Maybe. But given that you didn’t mention having half a dozen people over to your well-sealed 200 sq. ft. studio apartment, I’m guessing that’s not the situation.