I think Heath's hardware sells the signs as do probably most of the hardware stores around the lake. Temperature is not a bad way to run it although will probably run too much at the beginning of winter and not enough near the end when 32 will bring pretty rapid freezing especially at night. I find that pretty much below 15 to 20 degrees daytime temps that I need to run it all day. Obviously you don't need to run until ice in.
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