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House plants make too minor a difference to be worthwhile.

Opening windows is better but if you want a more energy efficient solution you should invest in a HRV/ERV

To my understanding, as with most carbon sequestration efforts, house plants are a long-term planning horizon solution. Filling your house with plants won't fix your biggest spikes in the CO2 in your home, but they'll lower the overall floor/median/average over a large enough span of time (months to years).

Relates to the long running "joke" that the best way to sequester CO2 today is to plant new growth forests 50 years ago.

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