"Andrew Gabriel" wrote

As others have said, no because it won't be able to get rid of
the heat. Another factor is there are usually relative height
restrictions between the indoor and outdoor units. Check the
instructions as you may well find the outdoor unit has to be
lower than the indoor unit. (They can be made to work the
other way round, but the DIY ones don't seem to be.)


The unit in question is this one:
http://www.airton.fr/produits/ASW%20...f%20403749.php

In the FAQ is this:
http://www.airton.fr/questions%20frequentes/faq06.php

so the two units may be up to 2 metres difference in height.
The 2 units have separate drains for condensed water. I plan to install the
inside unit on a partition wall between the bedroom and ensuite bathroom, so
the drain from that one can fall to the drain from the sink on the other
side of the partition.
If I do place the other unit in the loft, it will be able to drain into the
c/h header tank. I would place it on rubber to isolate noise and vibration.
I think the compressor/heat exchanger will be able to dump heat, but
obviously not as efficiently as an exterior mounted unit.
The loft has good ventilation, and in view of the low usage I think I'll
give it a go. If it fails miserably I'll let you know, but it may not be
stressed till next summer now.
Thanks to all for troubling to reply.
Neil