Windchimes are available in a wide variety of shapes, sizes, and designs. They're also ruled by the element of Air and can be used to guard your home against unwanted guests and negative energies.
Find, make, or buy a new set of windchimes. They should emit a definite sound. Before suspending them outside, charge them to do their task with the following (or a similar) spell.
Place the windchimes on a flat surface in your place of magick. Gaze down at them, realizing that they're lifeless, still, unmoving.
Wave your projective hand over them while saying:
Lift the windchimes by the string from which they will be hung. Hold them before your face. Blow against the dangling noise-makers, visualizing their tones scattering and driving away negativity.
Hang them up outside, with visualization, and let the windchimes do their work.
For the best results, repeat this simple charging spell every nine days.