I was surprised how well a large modern building ventilates CO2. We had some employees complain about feeling "stuffy" when air conditioning was turned off(due

I was surprised how well a large modern building ventilates CO2. We had some employees complain about feeling "stuffy" when air conditioning was turned off(due to budget constraints). So maintenance brought their own CO2 meter and I brought my trusty Aranet4. Both our readings were around 650 in a medium sized office with 4 people. Apparently the raise of temperature from 22C to 26C was enough to trigger internal "stuffiness". PS By comparison my bedroom regularly reaches 3000 in the mornings if no windows are left open.