I received a couple of quotes today to furnish and install 1-2 zone, 4 ton mini-split and 2-single zone 2 ton systems and was surprised the 2 zone system cost almost twice as much as the 2 single zone systems. Anyone have any ideas why that is? The barn/shop is about 1800 sq. ft. but has a high 20 ft. plus ceiling. I realize every installation is different but what kind of pricing are you folks getting for mini-split systems?