[kijin]

> In the tropics, you cool by extracting humidity, not injecting it. And extracting humidity might not work very well in a very dry desert...so...

You seem to be saying that an air conditioner requires significant ambient humidity in order to be effective. That doesn't make sense, as anyone from Phoenix, Arizona can testify.

A typical air conditioner does not cool the air by extracting humidity. It extracts humidity by cooling the air and so bringing it below its condensation point. Extracting humidity is a welcome side effect, since it helps us feel more comfortable, but it is not the primary function of a modern air conditioner.

[tunap]

Fellow Zoni here, and a moon-lighting HVAC service tech. To clarify a common misconception, A/C refrigerant does not cool air even though that is the net result. It actually absorbs heat and releases it outside the strucure. Sorry for the pedantry, but if we come here to learn, may as well learn the technicals.

http://web.mit.edu/2.972/www/reports/compression_refrigerati...

[dpark]

This is a distinction without a difference. Removing heat from the interior air is the same thing as cooling the interior air.

If you mean that the air conditioner doesn't produce a magical substance called "cool", that's true, but no one claimed that it does. The mechanism transfers heat with the effect of cooling the interior.

[tunap]

Just thought I would try to illuminate a prevalent technical misconception.

[dpark]

I get that, but he didn't make an incorrect or misleading claim. And honestly, most people on HN probably understand that air conditioners move heat.