Hi Peter, I am using Nebulosity2 with my QHY8Pro and don't have any problems controlling the TEC. Two methods can be used.
1. Set the setpoint in the preferences window.
2. Set the setpoint in the QHY9 control box under the view menu.
You must turn the TEC on in the Ascom driver setup first.
I am currently using the 64/32 bit system drivers and the Ascom drivers from
www.Astrosoft.be
The temprature control is a very nice step up from the standard QHY8.
Hope this helps