After a power loss the default thermostat mode is heat - would it be possible to change this to Cool?
Or should I use a virtual relay with a small timer to set all thermostats to cool after a power failure with a small timer ?
Or you could use one of the thermostat alarm channels to set the operating mode to cooling when the room is over a fixed temperature
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that’s a good one… 
… everything over 20C == Set to Cool mode …
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