I just want to say that Cavileer has it spot on. Make sure that you totally research who wants the horses etc.

I'm the lady mentioned by moonbeam, ie rescue horses in Qatar. The first one, Max is kept in a covered stables with no A/Cs which is what he has been used to for a very long time. He is on a farm that is surrounded by lots of trees so there is nearly always a breeze (even in the hot summer) The other horse I work with is a TB (ex racehorse) and during the summer he is kept in stables with A/Cs and wintered in non A/C stables. There is actually a shetland where the TB is stabled and he seems very content.

Cavileer is also right that some horses are kept in the lap of luxury. Research is the key here.

Hope that helps :)