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Hi all, first time out so be a little tolerant. I am looking out my window at a 10+ year old ac compressor that really needs replacing. The existing location is terrible as it is in a front courtyard, viewable from the street and within a few feet of the front entrance. I would like to move it to the side yard on the east side of the house. Since the house is build on a slab and I don't have an attic on that side I though that the easiest/best method would be to run the wires and pipes underground through (2) 3/4" conduits and a 2 or 3 inch abs pipe for the refrigerant lines. The total distance underground is less than 50' and about 10' to the air handler. As I am retired and on a limited budget I would do the digging (which oddly enough I don't mind, actually enjoy) and maybe even pull the wires. Is this (going underground) a stupid idea??? Thanks in advance, G
 

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It is not a good idea and the whole job would be VERY expensive to do. It may take 4-6 hrs plus freon, nitrogen test, copper tubing etc etc. My company would charge $600 to $1000 plus taxes to do it. It is not easy to bend large freon lines tightly and if you have elbows soldered in, it takes more time and there is a chance for leaks.
 

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The lines would need a lot of insulation.
And the pipe the lines are ran through, would need to be sealed to keep water out.

I can be done. But, you can lose capacity. And care must be taked to prevent refrigerant migration and oil slugging.
 

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New high eff units are quite, you should consider installing one in the same location with scalloped cinder block wall around it leaving enough room for service and air flow.
 
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