I have a two separate heating and cooling systems. The heat (radiator) get extremely hot upstairs but downstairs where the nest locate is colder…I found the solution last year to have the fan from the cooling system run 15 mins ever hour so it distributed the heat a bit better. My question is can I have two separate nest communicate with each other when the heating system runs, the cooling nest turn the fan on? I set the cooling to 90 degree in the winter so the compressor is not running.
