Tony Hwang wrote:
mike wrote:
My neighbor thinks her knee pain is related to humidity.
To test that theory, I looked into dehumidifiers.
But I'm hopelessly confused. About the only specs I find
are "pints/24 hours removed". Under what conditions?
The "buyer's guides" talk about conditions ranging from wet
to extremely humid.

I'm looking to take air at 68F from 65 to 40 percent RH or thereabouts.
Looking at some of the engineering data suggests that the dew point is
very low and it'll
be a LOT harder to do that than to get from 100% to 80% on a 95F day.
Outside temp is 45F or so this part of the year. The house is pretty
"tight".

What are my options to construct an experiment?
She has central air, so I could alternate between heat
and cooling???? But that sounds like a lot more cooling
than dehumidifying.

Idea
Hi,
Where do you live?
Knee joint pain? Humidity does not cause pain. Inflammation
coming from joint tissue stiffening. It can be 3 different cases.
Osteo athritis, Rheumatoid, Uric acid accumulation.

Barometric pressure changes can make joints hurt until the inside
pressure of the bones equalize with the ambient pressure. That's why
people say they know when it's going to rain, normally the barometric
pressure falls before the rain arrives so they have more pain. A lot of
people tie this into it actually raining, and/or humidity, and can
convince themselves quite easily that the actual rain, or humidity
effects the joint pain. I always found the humidity wives tale funny.
Does the humidity inside your knee change with the ambient humidity? Of
course not.