I will be meeting with a customer next week too discuss his control options. It is an industrial building that doesn't need real high end control over the temp.. I am thinking of pushing the pneumatic because of the low maintenance and how long it will last. It is not necessarily a hazordous building, but if they go DDC I will suggest explosion proof in many areas because of the high temps., it is a foundry. Does anyone have any drawbacks to pneumatic that I should consider? An example being the lack of techs. trained in servicing pneumatics.