3 ms·
When nobody is home so there's no CO2 being emitted, it goes down to outdoor levels within a couple of hours if your windows are open even a crack. If you have
by crazygringo 1y ago
When nobody is home so there's no CO2 being emitted, it goes down to outdoor levels within a couple of hours if your windows are open even a crack.
If you have a meter that shows you a graph on your phone, you can watch it reach equilibrium. It's very obvious.