DIY air cond installation

anyone replaced an existing a/c unit?
is it really as simple as they say for example on this unit http://www.wholesaleac.com/shop/product_details.asp?product_id 06
just hookup electric and in/out ducts to existing ducts?
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Almost NEVER as easy as it sounds. The link goes to a remote mounted compressor, or split system. You would need to sweat the freon lines, pull a vacuum and then open the valves.
Package units can be cooling on top or side or bottom. Return will be opposite the supply. If your changing types or manufactures odds are you will need a new elbow to connect to the ductwork.
You do realize if you buy it on line you will almost never get any warranty from the company that sold it to you. Manufactures are pretty pissy about EPA and CFC certifications. If you do not have them forget about warranty. Sorta like buying a Formula One car to drive on the street. When it breaks who ya going to call?
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There are installation instructions here http://www.wholesaleacproducts.com/wholesale/db/PAInstallInst.pdf
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More instructions http://www.wholesaleacproducts.com/wholesale/db/RQKA-SS.pdf Doesn't look easy.
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Yeah, for a package unit like that. But you have to have your ducts set up for one. If you are in a trailer and you are just swapping out a bad one, it's not too difficult. But if you are talking about a split system where you have to run new refrigerant lines, vacuum it out PROPERLY, install a filter/drier, etc. Then you are talking about having a lot of tools and equipment most people don't have and are pretty expensive to buy just to use for one job.
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