I had the temp sensor for both units in two different air intake grills - one with a muffin fan blowing on it (as you suggested) but was not happy with the result of either. I also have two seperate in-line coil heaters which use the same ducting and return grills as the AC.
The thermostats for these units are each hull
. They have worked well where they are located and that is where I located the AC sensors. So I had some reason to believe they would good for the heat side the AC system at least.
I hoping there is some software service
adjustments that can be made to these units. I know Webasto "Blue Cool" units are very adjustable but don't know how dumbed down these units are to achieve the price
they were shooting for.
BTW - I am trying to use the Webastos for heat because I think they should more efficient than in-line coil units. I am tracking the KW that I am using on daily basis so I should know more in a couple of weeks if I can get the Webastos to work ok. It is not obvious yet.