Why does defrosting a windscreen with both hot and cold air work?

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Shouldn’t only one work and the other make it worse?

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7 Answers

Anonymous 0 Comments

Blowing plain vent air will work, but it will take a long time.

Blowing air-conditioned vent air will work better, because one of the effects of air conditioning is that it removes moisture from the air. So you’re blowing cool, dry air.

Blowing warmed-up air-conditioned air works best. The air conditioning dries it out, and the heat warms it up without adding any more moisture, so now you’re blowing warm dry air.

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