What's the EER? As that's the effectiveness of the unit at 95F.The Mitsubishi 3 ton unit with 4 head units is rated at 19.2 SEER
I have experience with both window units and Mini Splits. I have not seen the fantastic changes in electric bills. But it is hot here in FL, and Cold in PA where my experiences were. The Mini Split in PA cost 3x more to operate than the NG furnace, and it did not provide quality heat. More like luke-warm heat.