We have baseboard hot water heat and heat with oil. Our domestic water is also heated by the oil burner. We often travel for extended periods and I hate to waste oil keeping the system warm if outside temps are above freezing.
I would like to install an outdoor temp sensor/switch that I could wire into the oil burner circuit to keep the oil burner off if it is above freezing, and only kick it on if temps fall below 32F. When kicked on, the zoned thermostats would maintain a minimum temp to prevent pipes freezing and such.
I poked around Amazon and such looking for such a sensor/switch but no luck. Can anyone suggest something that would work for this application?