Rich wrote:

A Las Vegas homeowner might do better with Sam's portable 797895 Arctic
Breeze cooler mounted inside a house near an open low window and
That unit may be able to cool a 9 x 9 room. Not much more than that.

You have my numbers. Would you have any evidence for your article of faith?

You can't recycle the air in the house. You have to get rid of the moist
air as it will not cool.
That's what the exhaust fan does, controlling the indoor RH precisely with
a humidistat, vs a swamp cooler without a humidistat.

But the air is already quite humid when it enters the house.

Think "portable swamp cooler, indoors."

Turn on the cooler when the house temp reaches 80 F and turn on the
exhaust fan when the RH reaches 60% to keep the house air at the upper
right corner (80 F and w = 0.012) of the ASHRAE 55-2004 comfort zone.

For an average good cooler pulling in 110 degree air at 10% humidity will
lower the temperature to 80 degrees.

Think "portable swamp cooler, indoors."

The exhaust fan is working all the time if that dinky portable cooler
can handle the load.

You have my numbers. Would you have any evidence for your article of faith?

Keeping that house 80 F while evaporating P lb/h of water into C cfm of
outdoor air means 1000P = (91.1-80)(128+C). P = 60C(0.075)(0.012-0.0066)
= 0.0243C makes C = 108 cfm and P = 2.62 lb/h, ie 7.6 gallons per day.
If the house has significant thermal mass (eg a floorslab), we can save
more water and energy by only running the cooler at night.

Nick