A packaged Unit is one in which the AHU and Condensing
unit is in one package.
The system you are describing is called a split system where
the AHU ( Indoor Unit ) is split from the ( Outdoor Unit )
condensing Unit.
The positioning of these Units relates to Duct and Pipe runs
which should be as short economical and direct as possible

The Refrigerant of choice should be ( R410A ) not R22 as
this refrigerant is due to be phased out.

"TSIs2000" wrote in message
oups.com...
I am contemplating installing a packaged heat pump - i.e. has stand
alone air handler as I have have no furnace now. Two questions 1) it
is OK to have the air handler in an upheated crawl space under a deck,
as opposed to under the house in a 20" crawl space. There is much more
room under the deck? 2) the best deals on are on R22 units - any
problems going with this older technology?