Re: window AC BTU

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Rxdoxx
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said by Willy

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The problem with to large a unit is it cools so fast that the room gets to cool then too warm as the unit goes on and off. You're not dehumidifying the room properly either.

Question. Would the larger unit be able to effectively run on a much lower setting? I know this is the case for my new dehumidifier, I have the fan speed on low, and it is a lot quieter (and more effective). Wondering if there can be a similar consideration that a larger unit could be effective on a low fan where a smaller unit would have to blast away noisily?
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permalink · 2008-04-08 08:38:03 · Print ·

Willy
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Re: window AC BTU

said by Rxdoxx

Yes that helps if you're dealing with 1 room and there's not to large a difference in the needed size and actual size. If you need a 5000btu you install a 8000btu your probably OK. The larger the units get the greater this problem could become.

I've seen bigger problems when people want to cool a whole floor or apartment with 1 unit.

Calculations say a 16000btu unit in a central location will cover the square footage but of course the calculations don't take into considerations the doorways, the twists and turns of the hallways, etc. so it doesn't cool the whole apartment. Now change that 16,000btu unit to a 25,000btu, even at the lowest settings that center room will probably be uncomfortable, and the rest of the apartment are still hot and humid.

permalink · 2008-04-08 09:03:59 · Print ·

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said by Rxdoxx

said by Willy

:

The problem with to large a unit is it cools so fast that the room gets to cool then too warm as the unit goes on and off. You're not dehumidifying the room properly either.

Under the right conditions, yes. Running a lower speed fan will create a colder evaporator coil which will remove more moisture and latent heat from the air. However, if the unit is grossly over-sized for the conditions and doesn't run long enough, it will not keep the humidity at acceptable levels even with lower fan speeds.
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permalink · 2008-04-08 09:10:38 · Print ·

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