So are you saying tejasrojas that a geo-system is not a good retrofit in a house with an existing duct work or that if retrofitting you just have to ensure it is sized properly? (just trying to understand for future reference).

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)