[antisceptic]

If you mean the size of the house, that's wrong. It depends on the number of inhabitants in the home and how often the home is ventilated. Considering plants grow in (lean) mass considerably faster than (adult) humans, the number of plants should be a much smaller number than "hundreds."

[Rebelgecko]

Household refers to the number of occupants in the house, not its physical size.

A family of 4 can easily create over 1,000 pounds of CO2 per year. Common houseplants like Spathiphyllum can absorb about 0.8g of CO2 per day, so we can be super generous and call it 1 pound per year. So you'd need around 1,000 plants, reduced depending on ventilation and how much exhalation you do outside of home.