| Mike,
This may sound, at first glance, kind of silly, but have you ever considered a heater? While we were in Dallas, it wasn't the severe cold temperatures that I worried about (the ambient water temps never got below 50 for very long and never below 47), but the wild temperature swings in the fall, and especially in the spring months. I sdimply set the temp for 10 F about the season water temps until they leveled off at 75.
Just an idea and some may say, "overkill" for your region.
Steve
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CKHPA
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