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Old 07-11-2012, 06:08 PM   #11
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I have one of those portable room a/c units at the farm. You do need to empty them almost every 24 hours. Fortunately, the unit shuts off when the tank is full.

Because of TOU electricity rates, the central A/C gets turned on only during the lowest rate times--7 p.m. to 7 a.m. Running the A/C during the most expensive rate period would up the cost of running it by 66%. I try to turn it on only when the house is 28C (~82F) or warmer. During the day, the windows are closed and covered. I try to restrict the amount of cooking and the number of times the dogs go in and out, and out and in. Fortunately, we have had nighttime temperatures of about 50-52F for the past couple of nights, so windows open at night, closed during the day. It promises to heat up again tomorrow through Sunday...and with that, the humidity arrives and the nighttime temps won't be as cool.

I so hate TOU electricity rates.
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Old 07-12-2012, 01:07 AM   #12
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The wet towel trick can cool down an 8x10 room by 7 or 8 degrees.
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Old 07-12-2012, 07:09 AM   #13
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There are a lot of variables. I live in a townhouse and it is much easier to cool than a freestanding house. With our old system (27 years old) we would have to set one temperature and let it stay at that for 24 hours, trying to recover even just 5 degrees took hours of it running constantly. The new system, we have it set for 80 degrees when we are not here, 74 in the evening, and 71 at night, and it cycles on and off. It is a much better system, that is a little larger (the house has more finished square footage that it did when it was built), and recovers quickly.

Luckily electric rates in my state aren't terrible, so it isn't extremely costly to stay comfortable.
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Old 07-12-2012, 10:34 AM   #14
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Quote:
Originally Posted by Four String Chef View Post
The wet towel trick can cool down an 8x10 room by 7 or 8 degrees.
What is that?
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Old 07-12-2012, 10:52 AM   #15
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to what is the wet towel applied?
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Old 07-12-2012, 10:52 AM   #16
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The wet towel is probably attached to a fan in the room.
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Old 07-12-2012, 12:05 PM   #17
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The evaporation rate of water is fairly low there for keeping the air coming off the towel cool. Place a wet towel in front of/on a box fan or ac unit. You're basically making a radiator.
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Old 07-12-2012, 12:09 PM   #18
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Ah I see. Thanks for the clarification. I just fill up a spray bottle and spray it at the fan occasionally. We have both ceiling fans and an oscillating fan.
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Old 07-12-2012, 12:13 PM   #19
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Another trick is to fill a shallow pan (roaster) with ice and place in front of the fan. I used to do that for my Newfoundland--I'd place box fan on the floor (inside an x-pen so the dogs couldn't knock if over) and place a large tray of ice in front of the fan. It helped before A/C (of course, this was also b/4 TOU electricity rates--I'm back to the tricks I used before A/C to keep cool during the day).
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Old 07-12-2012, 01:36 PM   #20
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Quote:
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The evaporation rate of water is fairly low there for keeping the air coming off the towel cool. Place a wet towel in front of/on a box fan or ac unit. You're basically making a radiator.
Actually you're making an evaporative cooler. It takes heat energy to evaporate water. In other words when water evaporates it sucks up a certain amount of heat, which turns the liquid water into water vapor. Evaporative cooling takes advantage of this, in effect cooling the air in exchange for increasing its humidity.
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