The frost line in Central Alabama is 18 in. If you trenched 48 in. and laid gravel then sewer line[for moisture control] and then blew the air across the heatpump coils , would this help the air to air exchange? How many feet of line would you need for a 2.5 ton unit? In central Al. we I need help with cooling more than heating. Where would I go to research this? Thanks for any and all comments?
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