Depending on the size of your house/apartment, you'll use up that oxygen in a couple of hours and will be back at 1000+ levels. Plus, there must be some ventila

Depending on the size of your house/apartment, you'll use up that oxygen in a couple of hours and will be back at 1000+ levels. Plus, there must be some ventilation in OP's setup already, as the CO2 levels are at 2000, and without ventilation they'd just rise until he passes out...