£7-£8k for Aircon system

danrv

Rodders53 said:
if any upwards direction a condensate pump is needed as water doesn't go uphill naturally.

Thanks. I see how it works now.
The unit in the cupboard (pic) is a condensate pump and the other two handlers connect to it.
A single drain pipe goes up through the ceiling and out/down the gable wall.
The handler in question just has the drain pipe going out horizontally along the wall. 
Maybe it needs more fall on it.