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Check the windows being used- make sure they are specified as high performance triple glazed or suspended film Heat Mirror type. Then also review and police up exterior solar shading. The radiant floor cooling only has a limited "output" of 11-12 btuh/SF so as a result, the envelope and heat gains have to be reverse designed to not exceed that limit. If there are rooms that exceed that 12 btuh/SF coolign load limit, then you'll have to supplement with the ventilation air cooling into that room - a re-cool coil on the branch duct can do that.
If you are going to be the guy responsible for making the radiant cooling work, then you should take a crash course in envelope design along with solar gain control and window specifications. If those components aren't done right, you'll get the blame for comfort conditions not being met.