Wind turbine comprising a tower with an interior enclosed by a tower wall which forms a heat exchange surface in an air cooling circuit wherein the tower interior forms a channel for guiding hot air along a flow path, wherein one or more air flow deflectors are arranged within the flow path for guiding the flow towards the tower wall. The flow deflectors can for example be active flow deflectors, such as fans or blowers, or passive flow deflectors, such as one or more static flow deflector plates or vanes, forming a static mixer element.