The situation:
We live in a one bedroom + den (rental). We're using the den as a second bedroom, as we're a family of four and that's what we can afford right now. The den has no windows, however, and so gets very warm.
The project:
We have a small 8,000 btu air conditioner that I would like to vent out the window in the living room. We're in a long-term rental situation, and our landlords are fine with us doing minor projects. What I'm thinking is cutting a hole in the ceiling of the den, and using flexible vinyl ducting run through the ceiling cavity (which I have access to). The cavity is just slightly too small to crawl through, so I'm wondering a couple things:
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Is there a problem venting an air conditioner through roughly 30' of ducting?
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Would would be the easiest way of fishing the ducting through the cavity?
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Are there any major problems that I'm not considering, or any simpler solutions? It's not possible to vent to the roof, and I'm wary about venting into the ceiling cavity. It's a straight shot from the den to the window.
A couple pictures:
Thanks for any help you can offer!
Best Answer
I suspect the owner's manual for your AC would spell out the duct length capacity but I strongly suspect that 30' is much too long, especially with that vinyl duct which is, quite frankly, garbage. Corrugated duct in general is not a great idea for long runs because it creates so much more air resistance but if you have to use it, look for the metal type which looks like a Slinky wrapped in tin foil. Not to mention it will last much longer. Better still, if you can figure a way to route it, is rigid sheet metal duct which you can get at a big box store and perhaps fasten smaller sections together as you push it ahead in the overhead space, sealing the seams with foil duct tape. That would give you the best chance at a satisfactory outcome but again, I think you will find 30' is too far for a small unit regardless...
BTW, do not under any circumstances vent into the ceiling space. Utter disaster in the making ;)