Tom Heywood

If the unit has frost protection, make sure the temperature it kicks in at is aroubd zero degrees. If you don't have a frost protection built i, add one to the intake duct. Also INSULATE those ducts and manifold otherwise you will get some big issues with condensation

I understand the key is in the ducting design, not the MVHR unit, you need a low pressure ducting system and need to ensure the MVHR designers is running acoustic tests to make sure its inaudible. Then putting a good unit on it will result in a high performing system. Zehnder Q units have humidity sensors built in so I'd argue additional ones aren't required in a domestic setting