Would 'swamp' coolers work well on hot Seattle days?

As Seattle sweats through a summer that is giving signs of being among the hottest on record, those who have eschewed air conditioning (eh, it's only used 3 days a year!) or live in a place where air conditioning is not an easy option, such as high-rise condo buildings that don’t allow window units and won't work well with portable air conditioners, might now be wondering what their options are.

Some have said they tough it out with a fan in front of a bowl of ice, but that's probably getting old, especially at night as the heat stretches from days to weeks.

I've had a few people ask me if "swamp coolers" or the more technical "evaporative coolers" would work as an alternate. They're usually cheaper than an air conditioning unit, can be ordered online, and some are portable and can work in a small room, such as a bedroom, to survive the heat until September... or October. Or 2016.

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