Assess the space
Find where birds enter around the outdoor unit and where service technicians need access.
Choose the right materials
Use weather-resistant mesh but leave the air intake, exhaust and drainage unobstructed.
Plan the installation
Position fixings so the net deters nesting without touching the unit or preventing repairs.
Keep it in good condition
Inspect after every AC service and repair any reopened gaps.
Questions for your site visit
Ask the installer to confirm the net arrangement with the unit's ventilation needs.