I AM IN THE MIDDLE OF BUILDING MY HOUSE IN MA. I HAVE BEEN PLANNING ON USING EVACUATED TUBES ( SOLAR ) ON MY ROOF AS MY MAIN HEAT SOURCE. I JUST HAPPENED TO RUN INTO AN OLD FRIEND THAT DOES GEO THERMAL. WE TALKED ABOUT IT AND THE BOTTOM LINE WAS, HIS RESURCH TELLS HIM THAT SOLAR WILL GIVE ME ONLY 20
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