Setup is 4evaps onto 2 units giving 100% redundancy.

We looked into the heat recovery option but were told that the energy calcs didn't add up due to the temps involved.

Thanks for the suggestion of the fact that the evaps could blow down the aisles. To me it looks a better option, however we are concerned that there would be a 'warm' spot at the ceiling height where the product would be above the discharge level of the evaporator. Didn't think about the maintenace thing. Will use that as a help to try and get the design to go look at the whole layout design again.