The water air handler, also referred to as a dedicated outdoor air system (DOAS) or an economizer, is an essential part of any building’s air handling system. In short, it deals with the exchange of air between outdoors and indoors, allowing the building to maintain comfort, performance and energy safety standards. On the surface, this may sound simple – but a water air handler involves complex processes that impact everything from efficiency to cost. In this article we’ll go over what a water air handler is and why its important in the business world.