Pc for use in space restricted & hot area

" It would appear that it can be cheap or cool and reliable but not
both. "

That's usually the situation. If I was building a brand new mATX system
with some considerable office power (instead of thinking along the
budget of a Casecom PSU) then the following would be pretty "cool"

= Lian Li PC-V300 #
= CoolerMaster iGreen Power 430W (RS-430-ASAA) #
= Asus M2NPV-VM sktAM2 mATX GeForce6150 #
= AMD Athlon 64 X2 3800+ 35W AM2 #
= Thermaltake A2321 Hardcano 14 HDD Cooler #

...plus whatever hard drive, however much DDR2 and whatever CD/DVD
drives are necessary.

It would appear that it can be cheap or cool and reliable but not both.

" Yupmobile CPUS such as Pentium-M. "

...but you'll pay ??150 to ??200 for a suitable socket 479 motherboard.
#

What work is it doing, if its only word pro, accounts etc are you making
it too powerful ie could you downsize the cpu etc.

Dave

part of an answer to your question might be-
consider very very powerful fans- choose tehm carefully. Maybe Vantec
Tornado.
get a case with 90 or 92mm and 120mm fan holes. You want a fan with
the most CFM possible.

I know it's not common, but you could try removing the side and
pointing a huge desk fan at the computer.

I think those AC/DC hot air blowers (often used to cool rooms in the
winter) can be set to blow cold air. Consider that isntead of the big
desk fan.

Consider air ducts # ., you could
stretch it out of teh room, I don't know how long those are. You might
not want to put it outside , though maybe if it's pointing down then it
won't get rain in it.

Consider a refrigerator style case. there are cases like that , that
use refrigerator technology to cool the processor, i'm not sure about
how it cools the rest.

You can get HDD coolers, like enclosures for the HDD with a fan in
them.

Monitor the temperature e.g. in the BIOS. You should not be in a
situation where you're nto sure if the machine is overheating. You
should know.

You might want a PSU with holes at the bottom of it where it is over
the CPU or HSF. That might help hot air to escape from the case.

Open a window to cool the room down!!

You can always get a case to room temperature, you won't have much
luck cooling a case below that. Check the temp in the BIOS so the case
is below 40C

If you use a P4, use a northwood not a prescott. It might be easier
to cool an AMD Athlon XP 1300+, than a P4.

really consider a blow heater to keep the room cool. Or a window. You
won't have any luck if the room is too hot. unless maybe you use the
air duct method - which might cool the room too.

MAybe a big case is better do the 2 HDDs aren't too near each other.
On the other hand I don't know how that'd effect circulation of air
when the side is on the case. I guess you'll need EXTRA powerful fans
to make up for the larger size. I like side off and desk fan idea, I
think it's worth a try. But monitor temp, it may not work, it's not
tried and tested.