Density separation of gases in the air is possible, however it is not easy or inexpensive. Modern methods require much higher pressures than could be achieved via inexpensive home equipment and would be dangerous. However, the easiest and most inexpensive way to limit CO2 in your house would be to limit the amount of CO2 generated by household objects. Alternatively, windows opened to the outside air will allow CO2 to diffuse to the lower level of CO2 in the atmosphere unless you live in an area in which the CO2 concentration is higher than 800pm. This however may not be the case if there is a larger amount of CO2 generation in the room than airflow will allow for diffusion out. If this is the case, increasing circulation with an HVAC system or fans may result in benefits.
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