Why do we use the air recirculation for the summertime AC in the car. Then, in the wintertime, we don’t use that button?
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A/C in a car takes a lot of energy, because you’re using a compressor to move heat from cold to hot when it wants to flow the other way. If it’s hotter outside than it is in the car, recirculating inside air will save energy.
Heat in a car uses waste heat from the engine, which is why it takes a few minutes to use. A car’s engine is constantly generating extra heat from tiny fuel explosions, so it’s no waste to use it.
In summer it stops hot air getting in after you just spent extra fuel powering the cooling system.
Leaving it on in winter leads to humidity build-up and a foggy windscreen.
Cold air holds less moisture than warm air. In winter when you want to defrost/defog windows, you want to remove moisture by blowing DRY air at it so the dry air absorbs that moisture (like a dry sponge sucks up water Better than a wet one).
Nothing more DRY than taking DRY cold air, heating it so it can absorb the moisture stuck on the windows.
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