Assess the space
Inspect the AC recess, drainage, airflow path and nearby service shaft for nesting spots.
Choose the right materials
Use outdoor netting that resists sun exposure, and keep mesh clear of moving or heat-releasing equipment.
Plan the installation
Fit around the entire access route without sealing off airflow, drainage or technician access to the unit.
Keep it in good condition
Check for new nesting at the edges during seasonal maintenance and keep the equipment serviceable.
Questions for your site visit
Ask for a fitting plan that shows how the unit can still be cleaned and repaired.