The title should explain itself. However, I get asked all the time do I really need a "freeze" sensor. If you properly winterization your irrigation system at the right time then no. If you're one of these folks that believes winterization in Georgis isn't necessary - think about last winter. Not only will your system not run when it detects rain BUT when the temperature drops below a certain temperature. Bump it up a notch and get both with Hunter's Solar Sync which also takes history of humidity, temp, etc. and waters only what you need and is slightly more expensive then a rain/freeze sensor and does more.
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