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

The biggest factor of defrosting is the humidity of the air used. As in, more than 80% of the effectiveness. When the designers of the air conditioning realized this, their designs started to focus on first drying out the air used before any other considerations. Warm air has more potential to carry moisture away and is more comfortable if it’s literally de’frost’ing and not just defogging so it is a secondary concern, but cool dry air is still more effective than warm moist air.

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