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For anyone considering this in a winter area: you only need a window open a crack to ventilate a whole apartment. More circulation happens due to the heat differential (I think?)

In any case it has little effect on heating bills. My canadian grandma actually used to have a window cracked open all winter, and she was rather frugal. My own heating bills changed little since I started.

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There must be some shape that can work as both air filter and heat exchange, so one could have ample air circulation while keeping the heat inside, at the cost of having to wash it once every few months.

I wonder how expensive that would be.

There are heat recovery ventilators, but they require central ducting. Unsure if any solutions exist for other dwellings.

There exists ductless HRVs too. HRVs are generally quite expensive. https://foursevenfive.com/lunos-e/

'Heat recovery ventilation' is the solution.

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