Change your air-conditioning system to a central system. Units hanging in your window will make your life miserable by stopping you from having curtains and long drapes. They interfere with other things you would like to do in order to make your home more comfortable.

Installing the air conditioner units in the wall will lead to drafts and the leakage of cool air in the summer, as will window units. You will have to cover them, another procedure that can be avoided. You will find the cost of an efficient centralized system that can be controlled by sectors, to be not any more expensive in utility bills than the separate units.

You might be able to use the heating ducts without a totally new installation of a duct system. Look into prices offered for a centralized air conditioning system. The main bulky box will be outside of your home and give the house an appearance of being larger.