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smart scene with temperature differential

I would like to use 2 Sonoff TH10 or TH16 to measure the inside and the outside temperature and trigger 2 fans whenever t out < t ins. I don't want to set a fixed target temperature.

Is that possible ?

Or could I use a sensor that measures directly the differential between two temperatures (like the ELV HM-WDS-30-OT2-SM 2), connect it to eweLink and Nest, and compare the resulting temp. diff. to a target temp. of 0° ??

Thanks for your help!

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