Power Cord, For Use With Packaged Terminal Air Conditioner Air conditioner installation accessories are tools and hardware for mounting wall air conditioners. They're used for applications such as providing support for AC units and wiring to an electrical source.Wall air conditioner accessories protect wall-mounted AC units from damage, aid their installation, and provide control of their operation. They're used for applications such as mounting the air conditioners, covering units that aren't in use, managing condensate and runoff, and programming temperature setpoints.