You will have to find the studs behind the siding. The studs are the 2x4 frame of your house and are normally 16 inches apart.Unless the aluminum siding covers a house that was already wood siding. If so skip the next step. You will probably need a stud finder, buy at Home Depot. Mark the location with a pencil, drill a small hole through the aluminum siding, so you dont bend it putting your hooks in. Then screw your hooks in and after going through softer insulation board 1/2 inch thick you will reach the stud.Good luck.