Andrew McKay wrote in message . ..
On Sun, 10 Aug 2003 18:33:08 +0000 (UTC), "Martin"
wrote:

How do portable units expel the heat?
Most units I have used in the past either have a heat exchanger (and fan)
mounted outside, or require a vent pipe for warm air to be blown out, so how
does a portable unit which says keep doors and windows closed expel the
heat?

I've got one roughly the same size as the one linked by the OP.

If you recirculate the air, forget it - it'll add to the heat in the
room. Opening a window and dropping the exhaust pipe out can help, but
it doesn't really help much because more warm air comes in the window.

The only solution is a firking great 4in hole thru the outer skin of
the house, thru which you poke the exhaust pipe.

But a 12x12 room? No chance. I've got 2 PCs in my study, combined they
chuck out about 500w of heat. The mobile aircon just about keeps up,
but only just. If I go sit in the study to admire the slightly lower
temperature it's over the top. And my study is something like 6x9.

Basically these mobile units are a pile of pooh. Don't bother is my
suggestion. I understand from comments made by others that you really
need a dual unit, where the fan is inside and the heat exchanger is
outside (I hope I remembered that right). Expect to pay a grand or
more for something like that.

Andrew

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I have one of these from comet - i got it last summer, its a 8000 BTU
unit and it drops the temp of my bedroom (4M x 4M) by about 10
degrees. I agree about the vent pipe - you can either use the foam
rubber sheet they supply you with but with hinged windows (as against
sliding windows) you still end up with huge gaps to let in the hot air
and as you the alterntive is a 4" hold through the wall........BUT in
a true diy fashion i built myself a window wedge from scrap wood that
fits in the opening of the window when its about 1/3 open with a hole
for the vent pipe and sealed round the edges with pipe insulation. So
not i just need to open the window to it fullest extend, then shut it
on the wedge and insert the vent pipe - it makes a good seal all round
including top and bottom.......it works great....only problem is it is
a bit on the large size but still it works

gin