The AC evaporator coils add heat to the air conditioning system. You could look at in another way. AC evaporator absorbs heats from area that needs to be cool and add the heat into the air conditioning units. For our decision the area that needs to be cool is indoor air. As you remember, energy can't be created or destroyed. AC units don't create heat or cool it uses air conditioning condenser to rejecting heat. Yes, that right! If you look outside your home, you'll see a square metal box outside. That is the condenser units! This is where it rejects the heat.