Forced air is really uncommon here. I have never seen it in a private home. You have radiators, or more luxuriously floor heating. And you definitely will get trouble with the damp and mold if you don't air your home properly, especially in older buildings like mine, that's from around 1900.
They were built back when the windows were the coldest because they were single pane or simple double pane and water would condense there and do no damage. Now windows are all insulated so often the coldest spots will be on the walls in the corners and you will get mold problems, because moisture from living will condense there if you don't air carefully. And that is why rental agreements often demand airing.
But I also rarely leave my windows open over night because without the sound insulation traffic is fairly loud. Though sometimes I have trouble with temperature in the summer because I'm directly under the roof and of course no one has A/C here, and unfortunately my windows all open only to one side, so no cross breeze. During one particularly bad heath wave few years back (iirc 2006? that year when many died of excessive heat in Europe) I left my front door open at night in addition to the windows as a last resort to get some air flow.
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They were built back when the windows were the coldest because they were single pane or simple double pane and water would condense there and do no damage. Now windows are all insulated so often the coldest spots will be on the walls in the corners and you will get mold problems, because moisture from living will condense there if you don't air carefully. And that is why rental agreements often demand airing.
But I also rarely leave my windows open over night because without the sound insulation traffic is fairly loud. Though sometimes I have trouble with temperature in the summer because I'm directly under the roof and of course no one has A/C here, and unfortunately my windows all open only to one side, so no cross breeze. During one particularly bad heath wave few years back (iirc 2006? that year when many died of excessive heat in Europe) I left my front door open at night in addition to the windows as a last resort to get some air flow.