Can I Mount A Window A/C Into The Wall, Exhausting To The Attic? - HVAC - DIY Chatroom Home Improvement Forum

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Old 06-01-2010, 03:59 PM   #1
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Can I mount a window A/C into the wall, exhausting to the attic?

Can I mount a window A/C into the wall, exhausting to the attic?
My room gets hotter than any other room in the house. I can't mount the air conditioner in the window because my room is in the front of the house (neighborhood rules). On the other side of my room is the attic above the garage. I wanted to mount a window A/C unit into the wall and have the back half hang in the attic.

The attic is pretty small (about 15x15) and has no attic fan. It has soffit and ridge vents. I realize I would probably need to install an attic fan and obviously have to run a drainage line for the water. My two concerns though:

1. Would this exhaust into the attic have moisture in it and be bad for the attic itself?

2: Having the back half of the A/C's coils exposed to the attic's 100+ degree air make the unit not work well? I live in New Jersey and it gets up to the high 90's in the summer.

Please let me know what I can do and I am very open to ideas. Thanks


Greg2230 is offline   Reply With Quote
Old 06-01-2010, 04:21 PM   #2
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Won't work real well. Could lose more then half of the A/Cs capacity.

Need to make a safety pan that would catch any water that may run out of the unit. So it doesn't damage the attic(2X4s, drywall, insulation, etc).

The attic may be 100 normally. But with the A/C running, it will get 20 plus degrees hotter. Making it harder for the A/C to cool your room.

Although more expensive. A mini split heat pump would work better. I'm guessing your room is also cooler in the winter.


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Old 06-01-2010, 08:56 PM   #3
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Have you looked at this kind of A/C units?
Instead of venting it through a window run it over to an eve vent in the garage instead.
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