My electrician will be installing my air-con soon and he is asking me where I wanted to install my air-con outdoor unit. Basically there are space to install the air-con outdoor unit above and below the windows (I am referring to the 1st floor of my link house). Is there any differences where the outdoor unit is placed? I now have 2 options:

1. Place the outdoor unit directly behind the indoor unit (back to back), in which the outdoor unit will be placed above the window.

2. Place the outdoor unit below the window, in which the copper piping will be pulled up to the location of the indoor unit (conceal piping).

I looked around my neighborhood and most of them chose to install the outdoor unit below the window. But then there are few who installed above the window as well.

Either condition also the contractor charging me for the same amount. So, fellow forumers, please help to advice.

Just now when I google around I found out that there is actually a minimum piping length requirement between the indoor unit and outdoor unit. The min distance is like 4ft+. So standard back to back installation (above window) will fail this criteria. I am not sure nowadays the aircon contractor actually installing the aircon back to back for the really good sake of the aircon or for the good sake of himself (less copper piping to use and less work to do)

Please note that most inverter model air-con uses R410A refrigerant, which is environmental friendly. It won't cost any harm to the Ozone layers. The R22 refrigerant is harming the Ozone.

Well, I know the talk of environmental friendly is not relevant to some but it sure concern me. That's the other reason why I choose the inverter model besides its cost effectiveness. I am not trying to be a saint, but this is to preserve the planet, which your future generations are still going to live in. If everyone just doesn't care, then God bless the earth.