Quote Originally Posted by Thermatech View Post
The telecoms 'clig on' type system with free cooling has been mentioned on this site before as ideal for any computer room with an accessable outside wall.
Unfortunately they are considered expensive.
However I would have thought any sales engineer worth his salt could sell this type of solution based on the free cooling , energy saving pay back period.

Provided tech backup & spare parts are available this would seem to be a much better solution after all its tried & tested in telecom cabins.
Agreed. Used to sell these to telecom & mobile networks when I was at Eaton-Williams. Problem is that much like splits they can't control the room humidity too well. No humdifier option on most makes and when it's on "free cooling" they can introduce high humidity if it's damp outside. This could be overriden with a humidistat but that takes away some of the benefit of the "free cooling". Big holes needed thru outside wall also - not something your average A/C engineer would undertake so extra builderswork costs. Some structural issues sometimes as well.