We have solar with a gas backup. We keep the back up set to 80 and let the solar do the rest. Very comfortable until the colder months when we shut down the gas heater and wait for spring to get back in the pool.
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Mark & Linnae
Birmingham, The U.P., Saginaw, Bay City, Toledo, Columbus, Dayton
& The Village of Chatham 
"I wish I didn't know now, what I didn't know then"
-Bob Seger-
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