Why do equipment manufacturers have minimum distances between condensing units if it doesn't affect performance?
Units that close will definately affect performance and could shorten the equipment life, but the contractor has already cashed the check and will not have to deal with it, so all is good, right??
The distances are somewhat arbitrary, and assume a perfect world. With the amount of air a condensing unit moves, I dont see the flow through the units being affected in the pictures I saw. Maybe you have some experience with units installed in that manner not performing properly?