My local supplier carries climatemaster products and im looking for some local info on payback & eer . They also gave me the name of a company that would drill & install the piping . Mine would have to be drilled since I im on a small parcel . I been told the payback is very fast . Whats the lifespan of the loop and the unit itself . Depending on what I can learn on here , I might wait and see how bad my gas bills going to be here in southern ohio . I did a load on my houses several years back and I think it was 56k heating and 29k cooling . I currentley have a 5 yr old a/s 82% gas d/f on a slab . Thanks Bh