"George Patterson" wrote in message
news:kbmle.263$zb.134@trndny04...
Both heating and air conditioning systems are dehumidifiers.

How so?

When cooling air below ambient, an air conditioner does dehumidify. But the
net temperature change in an airliner is positive, and it's heated before
it's cooled. No loss of moisture there. Heating air does lower the
*relative* humidity, but that doesn't mean that moisture has actually been
removed (which is what dehumidifying is). No loss of moisture there either.

At what point is it that you believe moisture is actually *removed* from the
cabin air in an airliner?

Pete