On Monday, July 9, 2018 at 11:51:30 AM UTC-4, Ed Pawlowski wrote:
On 7/9/2018 10:47 AM, trader_4 wrote:


I'm not even sure I understand how they work in an area with dry climate
when they are inside. I would think it would work fine for a few hours
until the humidity got to a reasonable level. Once the humidity passes
about 60%, then what? Do you open windows to let hot, dry air in? Or
do you just use them to cool one or two rooms and the rest of the house
is hot and dry enough that there's enough dry air?


I imagine you can feel cooler for a while sitting right in front of it
but the heat does not disappear, it is just moved to the other parts of
the room. To truly cool, you still have to move the heat out, not just
disperse it. Since the motor is running, it is actually creating more
heat.

Putting a bag of ice on your head would be more beneficial.

It's not just feel, it really does cool the room, ie the temp will drop,
the heat is moved into the water by evaporating it. The part I question
is what happens after the temp drops a bit, but the humidity has increased
to 60%, 70%+? Then what? At the higher humidity the cooling effect diminishes
and the room feels humid, so now what? Do you open a window to let in
hot, dry outside air? It could work indefinitely if you just ran hot,
dry air from outside into it. But if it's 95 outside, how cold is the
air coming out? I'd guess it could drop it ten degrees or so, but then
you'd have 85F air which isn't much. Or do they just use these to blow
cooler air on you when you're outside on a patio or inside with the
windows open? Has me wondering.