I am looking for a ventilation unit that will allow me to draw hot stale air out and draw in fresh air that can be heated (if necessary) from the stale air being expelled. The ventilation unit will draw from 5 bathrooms and also a 'hub cupboard' containing electronic equipment (hot air) and then feed fresh air back in to the house via outlets (upstairs and downstairs). I would also like to be able to cool the incoming air during warmer periods (Spring & Summer). It seems I need a combined heat exchanger/chiller unit but I have no idea who manufactures them for the UK?