Ok, seriously....the Supco CO2 detector reads 1360 ppm this morning compared to 525 ppm outside. BTW I have a Prestige IAQ thermostat with ventilation and dehumidification. The vent is a 6" Automated zone damper tied to the return, very short run. I'm going to make sure that thing is opening all the way.
Ok, I do have six children under 10, so ventilation is more crucial here. The prestige ventilation is set for the sq footage of the home.
The Supco seems to be reading a little high 525 outside and all. But the swing from indoor to outdoor is outrageous.