My question and fears are that it will not be compatible with item #2 - W8900 Remote Module sitting in the attic for whatever it does.
So, my question is if its Ok to change it or do I have to go a different direction ?
I have called Honeywell and their only response is that I have to get their most expensive unit + change module also. My take on talking to them is they are only interested on selling me another product.
It used to be very easy to change thermostats in the old days but now things seem more complicated. The only extra I see in this unit is that it has an extra vent coming from outside for fresh air + it has an electronic open/close device on it. That is it.