I am finalizing my MVHR specification, having to self install, as there are no contractors who will fulfill my requirements (no surprise). I will be fitting 2 x Brink Renovent Excellent 400 Plus units with Ubink ducting.  I have discovered that I can get internet connections for the MVHR units so I can do away with the 3 position switches/remote controllers and use a web interface/ app to control them.  I will be fitting RH sensors in the extract ducting to auto boost the system, but I was