Air conditioning coil has been pressurized and dipped in water. As you can see this coil has many microscopic leaking sources on copper tubing.
An air conditioning package unit is lifted to roof by cane for installation. AC unit is supported on roof curb made of sheet metal. The curb supports weight and provides air duct penetration though roof for down shut installation.
Mini split air Conditioning systems are getting very popular these days. There are two types of mini split air conditioning, single zone and multi zone. Single zone is good to cool a single room or office. A multi zone mini system can serves a couple of rooms with several indoor units and a single condensing unit. this option provides very efficient way to air condition each room separate form each other, bare in mind these system is also have higher SEER efficiency rating than to stander central AC unit that is maxed to 14 or 16 SEER.