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I would like to turn a whole house fan on when the temperature outside is lower by 5 degrees than inside. So if the outside is 75 degrees and inside is 80 I want the fan to turn on. But I also want the fan to turn on if outside is 87 and inside is 92 (for example) so I really need to control the fan on the difference of the temperatures. Also, I want to turn the fan off if the temperature outside and inside is within 2 degrees. Is there anyway to calculate a temperature difference and turn things on or off? I'm new at this. Are variables something that could be used?

There isn't an issue with up dating the values. The problem is that the 'Current Temp' field is completely blank. Setpoint, humitity are all there. Humitity updates as advertised. The value in the 'Current Temp' Field is missing. And I am running on Bat. Regards

I spoke a little too soon. The device registers and gives me all the information accept the current temperature. Also, the values do not show when I go to the table with all the devices. BTW, all I want is the current temperature from the device. It gives the humidity just fine, just not the current temperature. Cheers

I was using an older version and did upgrade it to the latest. But the ZTH was not on the list and I didn't try auto registering the device. So from reading your post I tried auto registering and it showed up. Thank You. (I think it needs to be on the list for manual installation). Cheers

I bought one of these thermostats wanting to put 4 around my house to help control heating and cooling in my hous but the unit is not part of the available devices in my isy-994i device. When will this be available? There are no other good solutions for a temperature sensor. Thank You