Heat Pump

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?
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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.

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There are manufacturer requirements for clear space around th condensor and for access to the air handling unit. They will be a bit different from unit to unit. T
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Incidentally Packaged Units are often overlooked by home owners who wish to install there own A/C Units
These Units are fully Piped up and Pre-charged with refrigerant and require only additional wiring for power and control . The installation of these Units then comes down to Duct layout Supply and return.

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