Installation o fan air-handling unit with integrated heat pump circuit, model HPS205 with high efficiency 90% counter-flow heat recovery unit, %, installed at the Landal Coldenhove park in Apeldoorn area, The Netherlands. This is a holiday park surrounded by nature which boasts over 350 bungalow, camping sites, wellness centre, indoor swimming pool and a vast restaurant, whose air change-over is censure by the HPS205 unit operating 24/7.