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You need to clean/replace filters periodically. You may want to increase/decrease the percentage of time it runs or fan speed depending on various factors (say, for a party with many guests or the weather vs electricity usage).
 

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good info simon. thanks!
Not being too scientifically- inclined.....I wonder just how effective these machines are in colder, damp(humid) areas, like here in St. John's, where outside humidity is almost always above 75-80% (a lot of time 100%!) ?
Aren't you continuously just dragging cold, damp outside air into the house.....?
Cold air can't hold very much moisture, so even in cold climates with high humidity, once you warm up the outdoor air it has low relative humidity.
 

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There is an excellent wikipedia entry on humidity. Here is the article and the pertinent chart.



100% humidity air around 0C can hold about 5g of water per kg of air. Air that is 20C can hold about 15g of water per kg. So if you take 100% humidity air at 0C and warm it to 20C, it can only have 5g of water out of a possible 15g, so it will only be about 33% relative humidity.

This is how air conditioners remove humidity from air, by the way. ACs cool the air, and since cold air can only hold so much water, much of it condenses on the heat exchanger. When that very cold air mixes with the warmer air in the rest of the home it averages out to a lower relative humidity.
 
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