On Wed, 26 Apr 2017 10:02:26 +0000 (UTC), unk wrote:

I want to cut AC power if the temperature drops below a close-to-freezing
temp, and I want it to work even if there's no power (takes care of the
power fails first then system freezes then power is restored - bang goes
pump motor). This needs to be accurate to about 1-2 degrees.

Standard temperature switch.

https://www.google.com/search?q=temp...utf-8&oe=utf-8

If its to be in a fixed location, a less hardy version can be used

They have been around for at least 100 yrs


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