It is recommended to replace aluminum alloy windows promptly if any of the following occur:
1) The window seal is compromised, allowing hot or cold air to enter the home.
2) The window frame is severely deformed and has lost its original load-bearing capacity.
3) The window surface is severely discolored, damaged, or oxidized, resulting in a shortened lifespan.
4) The window has exceeded its service life (approximately 20 years).
