Hi everyone, we were at a fair at expo and was looking at Mitsubishi HI aircon, the staff offer us a free upgrade to 1/2 inch aluminum pipe cos we were the last customer as everyone is packing up. Just wondering is Aluminum really better than copper? The model we took was SRK25ZJ-S Free upgrade Alum SWG 17 Armaflex 1/2 Insulation Class 'O'