Thanks AC. I'm in the 98366 zip code.
While researching anti-freeze I came to the conclusion that in my area I can probably get away with a 20% antifreeze solution in my ground loops. I will accommodate the transfer and pumping efficiency losses with a correctly sized loop pump.
I don't need a whole lot of cooling in the summer, so I probably don't need anti-freeze in the hydronic system. It wouldn't kill me to have some corrosion protection in that portion of the system.
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