On 5 Aug, 23:28, wrote:

I dont know whether for the same cost you could get a big hole dug
under the shed. If so, exposure to underground soil would help keep it
below outdoor temp all summer long, free of run cost.

Drill big hole under shed, rabbits go down hole, no problem. That's
how it works in the wild.

ISTR that rabbits can hear high frequency sound inaudible to humans. A
fan that sounds quiet to you might be intolerable to the bunnies. I
suppose you'd only know if they showed signs of distress.

High frequency sounds are also most easily attenuated, which is why
you can only hear the boom, boom, boom of the bass drum when the
neighbours have a 2 am garden party.

If you want A/C for the rabbits you'd probably be better off with a
chiller, which produces chilled water which is pumped to & from a fan
coil unit or something similar. You could do it with a cheap split AC
unit, piped with insulated drain pipes and fans, but I'd anticipate
that control of the air temperature would be nearly impossible to
achieve. How would you do it? A variable (cold) air volume system with
a terminal reheater? It gets very silly very quickly. The cheap end AC
units are cheap cos they're made in huge numbers, a chiller with a
similar output would be much more expensive. Chilled water, radiant
cooled slab (like UFH with cooling).