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Just wanted to find out if the vent should be open or closed when air conditioner is on..

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If you are talking about a whole house ducted system, it is best to keep all vents open.
If you are talking about a window air conditioner, the vent is mainly intended to bring in fresh air, usually people keep them closed, unless you are just running the fan only and want to bring in cooler fresh air, like in the early mornings.
If this has helped, please rate me, or contact me back with any further questions that I can help you with.
Sincerely,
Paul Gibson

Posted on May 03, 2010

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If knave a Kenmore window ac unit is the vent suppose to be open or closed


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The vent open draws in a small amount of fresh (outside) air to mix with the air being recirculated in the house to provide an air exchange. The vent closed will circulate the air already in the house.

In most cases its a good idea to leave it open unless you have a drafty house or find it difficult for the air conditioner to keep up.

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F1, F2, and F3 are the strength of the fan blowing the air conditioner. F1 circulates the least amount of air, F3 the most. I generally find that if the air conditioner isn't getting the job done on F1, F2 will do it. I typically only use F3 if I just want to circulate air fast in my place for awhile. As far as what is "better" with closed vent or open, that depends on what you want to do. If you are using air conditioning on a hot day, then vent closed is better because it will cool only air circulating in your place. Vent open will allow fresh air in from outside, and if it's a really hot day, the air conditioner might have a harder time cooling off the fresh air than the circulating air inside your place (as it's continually being cooled repeatedly by your air conditioner).

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F1 - F3 are the fan speeds when the air conditioner is in fan only mode.

The vent can be opened or closed based on your preference. When the air conditioner is in a/c or dehumidifier mode having the vent closed will cause the a/c unit to recirculate the room air and cool / dehumidify quicker. When you open the vent the a/c unit takes air from outside and cools / dehumidifies it. It is obviously not as efficient this way but it does bring in fresh air.

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