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[–] NamelessCrewmember 1 points 13 points (+14|-1) ago 

It's better to exhaust. The reason is if you blow in, you create turbulence that mixes your cool and warm air, and a mix exits the other window, limiting effectiveness. If you exhaust, the incoming air from opposite window is less turbulent, doing a better job of air exchange,

The next part is that fan is probably 100 watts of power and if you put that fan blowing in, that 100 watts goes on to the room. Put the fan in the room, close both windows and run it, the room will heat slowly.

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[–] Morbo 0 points 2 points (+2|-0) ago 

Don't open that window! Is there air? You don't know! Hehe, is your name Guy Fleegman?

Your username and discussion of air made me think of this clip.

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[–] NamelessCrewmember 0 points 1 points (+1|-0) ago 

Thanks for that, an awesome movie, one everyone needs to see at some point. Less than sober maybe...

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[–] DoomMantia [S] 0 points 1 points (+1|-0) ago 

Thank you! I hadn't thought about the turbulence.

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[–] HorseIsDead 1 points 0 points (+1|-1) ago 

Uh fans are more than 0% efficient... you're not putting 100 watts of heat into the room.

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[–] NamelessCrewmember 2 points -2 points (+0|-2) ago 

All electric devices are 100% efficient at taking the used wattage as measured coming in, and turning it into heat. Incandescent light bulb, fan motor, space heater, mini fridge.... If the device is in a sealed featureless room, it matters not what it does, the power used is turned into heat that is dissipated into the room.

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[–] Grospoliner 0 points 6 points (+6|-0) ago  (edited ago)

Engineer here. You want to create air flow through the space, so place your window fan blowing outward to pull air into the space. If your windows oppose one another, or are on the same wall at opposite ends of the wall, this works out great. If windows are adjacent then it's not very effective. In the case of adjacent windows, go to another nearby room and open a window there. Prop open your doors between the two rooms and pull air through both. With a small enough house, you can use this to cool the entire house down.

This is the reason that all attic fans blow air out through the roof.

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[–] Gravspeed 0 points 1 points (+1|-0) ago 

Also the bonus of blowing all the 120 degree air out of the attic

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[–] DoomMantia [S] 0 points 0 points (+0|-0) ago 

Thank you! The windows are on opposite walls, so your suggestion should work.

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[–] arrggg 0 points 4 points (+4|-0) ago 

Don't be so cheap. Go get a second fan and do both...

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[–] DoomMantia [S] 0 points 3 points (+3|-0) ago  (edited ago)

Hahaha, actually the reason for making this post is being cheap. I have AC in my bedroom, but I wanted to save a bit on electricity by cooling down the living room.

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[–] schwanstucker 0 points 1 points (+1|-0) ago 

Both work. If your fan is powerful, you may find that it's more effective to draw the air in through another window by pointing the fan outward. If not, you should focus the fan on yourself.

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[–] sniper98g 0 points 1 points (+1|-0) ago 

Is the room totally sealed except for the two windows, and is the window with the fan in it sealed up around the fan?

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[–] DoomMantia [S] 0 points 1 points (+1|-0) ago 

No and no.

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[–] Veridic 0 points 1 points (+1|-0) ago 

It probably matters more which way the wind typically blows. I would probably put it pointed out the east window, or south window, which would go with the typical wind where I live.

Also, the fan is adding a small amount of heat from the motor, so technically speaking exhausting is better because the fan motors heat goes outside the room.

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[–] Arotaes_Forgehammer 1 points 1 points (+2|-1) ago 

Place it blowing inwards, definitely.

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[–] Gravspeed 0 points 5 points (+5|-0) ago 

Blowing inwards will feel better if you are sitting in front of it. But blowing out will actually change out the air in the room faster.

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[–] KidQuantum 1 points 0 points (+1|-1) ago 

Doesn't matter. Assume the room is airtight except for the windows. If you point it in or out you are still exchanging the same amount of air.

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[–] Grospoliner 0 points 2 points (+2|-0) ago 

Houses are not airtight. Most houses have about 1 air change per hour, a function of the volumetric flow rate of air into the room and the space's volume.

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[–] KidQuantum 1 points 0 points (+1|-1) ago  (edited ago)

I said assume it's airtight to demonstrate it doesn't matter which way the fans point. Of course houses aren't airtight.

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