Anyone come across them? They are effectively in-ceiling radiators that can be used for both heating & cooling. Zehnder do them, they require a minimum ceiling height of 2.2m &, subject to cost seem as if they could offer a good solution to temperature control on a first floor. I am waiting for more info, but would love to hear from anyone with experience of them. The web page is below:   https://www.zehnder.co.uk/products-and-systems/heating-and-cooling-ceiling-systems/zehnder