ducted mini split heat pump air handler orientation question
I know there are DIY ductless heat pumps available, but I'm looking to retrofit a ducted system into the space designed for a downflow furnace in a manufactured home. I haven't seen any advertised DIY systems that are designed to mount the air handler in a downflow orientation. Even the MRCOOL Universal system, advertised as allowing "multi-positional installation", specifically allows only horizontal and upflow orientation.
I'd rather avoid kludging together an awkward 90 or 180 degree bend in the ductwork. So is there some compelling reason an air handler MUST be oriented as advertised? If, for example, I mounted a "horizontal only" air handler pointing downward, would anything bad happen in the short or long term?