Smappee Turn off plug. Google Nest Thermostat Temperature rises above.

If nest temperature rises above 21°, then Turn off plug smappee switch

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During energy crisis, The smappee switch is turned on by solar energy injection. This helps lowering my gas bill. But when this the temperature is reaching 21 degrees , i wish turning off the heating since this is a satisfying temperature and injection to the net is alo earning money.