Unrelated to the project, but your CO2 levels are far to high. The maximum should be around 600ppm.
EDIT: ah, looking at a CO2 monitor, it says "Indoor air quality: Good (0 to 800ppm), Normal(800 to 1200ppm), Poor (>1200ppm) indication"
You would have to place water immersed algae farms on every open space in the house and keep them illuminated with artificial light 24/7, because plants will produce CO2 at night otherwise.
Like you said, good ventilation is far more effective than any plant.