It is better to call a professional when setting up a cooling system. The professional knows how to do it the right way. The greatest issue is that a cooling system has a particular amount of refrigerant that goes in it on the initial upgrade. If the amount is wrong on the initial set up, the air conditioner can’t recover. If too little of refrigerant, the parts on the cooling system grind together & wear out. If too much refrigerant, the liquid overflows & damages the inner actually workings. The a/c unit with unusual refrigerant will have more frequent A/C repairs & actually extravagant repairs. Second, the cooling system will have about half the lifespan that it should have. All of this happens when that initial set up is wrong. Homeowners don’t guess these tricks of the trade. The average person will not pay attention or mess up the levels hurrying the cooling set up. It is better to call a professional A/C corporation. This way you guess the A/C system is set up the familiar way, but you actually save money using a professional. The cooling system will run more efficiently than when a homeowner will set it up. The cooling upgrade does not cost too much in the end. You additionally spend so much money on the A/C plan. Why would you skimp out on the actual set up & possibly damage it? It is not worth saving a few bucks doing this. It is better to have that peace of mind knowing the cooling unit is actually working at peak efficiency.